diff --git a/.gitignore b/.gitignore
index d4e7333..d96b00e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,6 +47,7 @@ typings/
 
 # Optional REPL history
 .node_repl_history
+.history
 
 # Output of 'npm pack'
 *.tgz
diff --git a/CONFIG.md b/CONFIG.md
index d4ee2bf..79065a9 100755
--- a/CONFIG.md
+++ b/CONFIG.md
@@ -26,7 +26,7 @@
       /* UI */
       ui: {
 
-        columns: 6, // Total are 12 columns.
+        columns: 6, // Total are 12 columns. [support dx expression]
         label: '', // Label display [support dx expression]
         showLabel: true, // Whether to show the label (when it is false, it still takes up space)
         noLabelSpace: false, // Whether the label does not occupy space, the priority is higher than showLabel
diff --git a/CONFIG_CN.md b/CONFIG_CN.md
index 176c719..13b1464 100644
--- a/CONFIG_CN.md
+++ b/CONFIG_CN.md
@@ -27,7 +27,7 @@
       /* UI */
       ui: {
 
-        columns: 6, // 占用列数，共12列。
+        columns: 6, // 占用列数，共12列。【支持dx表达式】
         label: '', // 标签内容【支持dx表达式】
         showLabel: true, // 是否显示标签（注意：当为 false 时，依然占着空间）
         noLabelSpace: false, // 标签是否不占空间，优先级比showLabel高
diff --git a/packages/ncform-common/test/unit/ncform-utils.js b/packages/ncform-common/test/unit/ncform-utils.js
index 7a2ce7b..6ebf39e 100755
--- a/packages/ncform-common/test/unit/ncform-utils.js
+++ b/packages/ncform-common/test/unit/ncform-utils.js
@@ -374,6 +374,35 @@ describe('/src/ncform-utils.js', () => {
     console.log(JSON.stringify(formSchema, null, 2));
     assert(formSchema.properties.name.value === value.name);
   });
+  it("setValueToSchema - 对象嵌套数组再嵌套对象", () => {
+    const value = {
+      user: [
+        {
+          name: "jorge"
+        },
+        {
+          name: "ping"
+        }
+      ]
+    };
+    const formSchema = {
+      type: 'object',
+      properties: {
+        user: {
+          type: 'array',
+          item: {
+            type: 'object',
+            properties: {
+              name: "string"
+            }
+          }
+        }
+      }
+    };
+    ncformUtils.setValueToSchema(value, formSchema);
+    console.log(JSON.stringify(formSchema, null, 2));
+    assert(JSON.stringify(formSchema.properties.user.value) === JSON.stringify(value.user));
+  });
   it("setValueToSchema - 普通数组", () => {
     const value = ['daniel', 'sarah'];
     const formSchema = {
diff --git a/packages/ncform-theme-elementui/conf/webpack.config.prd.js b/packages/ncform-theme-elementui/conf/webpack.config.prd.js
index 8c01501..a8ce7bb 100755
--- a/packages/ncform-theme-elementui/conf/webpack.config.prd.js
+++ b/packages/ncform-theme-elementui/conf/webpack.config.prd.js
@@ -7,7 +7,7 @@ module.exports = {
 
   mode: 'production',
 
-  devtool: false,
+  devtool: 'source-map',
 
   entry: {
     ncformStdComps: path.join(config.src, 'components', 'index.js'),
diff --git a/packages/ncform-theme-elementui/package-lock.json b/packages/ncform-theme-elementui/package-lock.json
index a433ee0..2e11785 100755
--- a/packages/ncform-theme-elementui/package-lock.json
+++ b/packages/ncform-theme-elementui/package-lock.json
@@ -5,12 +5,12 @@
   "requires": true,
   "dependencies": {
     "@ncform/ncform": {
-      "version": "1.6.6",
-      "resolved": "https://registry.npm.taobao.org/@ncform/ncform/download/@ncform/ncform-1.6.6.tgz",
-      "integrity": "sha1-Ma92hGwhzu/XV4C/sInScQIu0hY=",
+      "version": "1.6.9",
+      "resolved": "https://registry.npmjs.org/@ncform/ncform/-/ncform-1.6.9.tgz",
+      "integrity": "sha512-KSwvFwON0pNpWbT725TR1uEbTqLm/a13BGJIh8NKNkb5iRBpknG/S941PbjI7lj4A1+PCMgvZrqgH0pQGf5r3Q==",
       "dev": true,
       "requires": {
-        "@ncform/ncform-common": "^1.6.6",
+        "@ncform/ncform-common": "^1.6.9",
         "axios": "^0.18.0",
         "extend": "^3.0.1",
         "lodash-es": "^4.16.2",
@@ -20,8 +20,8 @@
       "dependencies": {
         "axios": {
           "version": "0.18.1",
-          "resolved": "https://registry.npm.taobao.org/axios/download/axios-0.18.1.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Faxios%2Fdownload%2Faxios-0.18.1.tgz",
-          "integrity": "sha1-/z8N4ue10YDnV62YAA8Qgbh7zqM=",
+          "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.1.tgz",
+          "integrity": "sha512-0BfJq4NSfQXd+SkFdrvFbG7addhYSBA2mQwISr46pD6E5iqkWg02RAs8vyTT/j0RTnoYmeXauBuSv1qKwR179g==",
           "dev": true,
           "requires": {
             "follow-redirects": "1.5.10",
@@ -30,8 +30,8 @@
         },
         "debug": {
           "version": "3.1.0",
-          "resolved": "https://registry.npm.taobao.org/debug/download/debug-3.1.0.tgz",
-          "integrity": "sha1-W7WgZyYotkFJVmuhaBnmFRjGcmE=",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
           "dev": true,
           "requires": {
             "ms": "2.0.0"
@@ -39,8 +39,8 @@
         },
         "follow-redirects": {
           "version": "1.5.10",
-          "resolved": "https://registry.npm.taobao.org/follow-redirects/download/follow-redirects-1.5.10.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Ffollow-redirects%2Fdownload%2Ffollow-redirects-1.5.10.tgz",
-          "integrity": "sha1-e3qfmuov3/NnhqlP9kPtB/T/Xio=",
+          "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.5.10.tgz",
+          "integrity": "sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==",
           "dev": true,
           "requires": {
             "debug": "=3.1.0"
@@ -48,16 +48,16 @@
         },
         "is-buffer": {
           "version": "2.0.4",
-          "resolved": "https://registry.npm.taobao.org/is-buffer/download/is-buffer-2.0.4.tgz",
-          "integrity": "sha1-PlcvI8hBGlz9lVfISeNmXgspBiM=",
+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+          "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A==",
           "dev": true
         }
       }
     },
     "@ncform/ncform-common": {
-      "version": "1.6.6",
-      "resolved": "https://registry.npm.taobao.org/@ncform/ncform-common/download/@ncform/ncform-common-1.6.6.tgz",
-      "integrity": "sha1-HXpaF5iGPiAR+fIVIzJgTgX0o0w=",
+      "version": "1.6.9",
+      "resolved": "https://registry.npmjs.org/@ncform/ncform-common/-/ncform-common-1.6.9.tgz",
+      "integrity": "sha512-ZmSL3IpcDStcdx07fAPMaD0qTIK1HWp3XvDyP4Ql7GKg9KhiIiGRY9cDbyCyrjvAxN6ykYvPKT+oipgqaMkDgg==",
       "requires": {
         "assert": "^1.4.1",
         "axios": "^0.18.0",
@@ -68,8 +68,8 @@
       "dependencies": {
         "axios": {
           "version": "0.18.1",
-          "resolved": "https://registry.npm.taobao.org/axios/download/axios-0.18.1.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Faxios%2Fdownload%2Faxios-0.18.1.tgz",
-          "integrity": "sha1-/z8N4ue10YDnV62YAA8Qgbh7zqM=",
+          "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.1.tgz",
+          "integrity": "sha512-0BfJq4NSfQXd+SkFdrvFbG7addhYSBA2mQwISr46pD6E5iqkWg02RAs8vyTT/j0RTnoYmeXauBuSv1qKwR179g==",
           "requires": {
             "follow-redirects": "1.5.10",
             "is-buffer": "^2.0.2"
@@ -77,24 +77,24 @@
         },
         "debug": {
           "version": "3.1.0",
-          "resolved": "https://registry.npm.taobao.org/debug/download/debug-3.1.0.tgz",
-          "integrity": "sha1-W7WgZyYotkFJVmuhaBnmFRjGcmE=",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
           "requires": {
             "ms": "2.0.0"
           }
         },
         "follow-redirects": {
           "version": "1.5.10",
-          "resolved": "https://registry.npm.taobao.org/follow-redirects/download/follow-redirects-1.5.10.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Ffollow-redirects%2Fdownload%2Ffollow-redirects-1.5.10.tgz",
-          "integrity": "sha1-e3qfmuov3/NnhqlP9kPtB/T/Xio=",
+          "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.5.10.tgz",
+          "integrity": "sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==",
           "requires": {
             "debug": "=3.1.0"
           }
         },
         "is-buffer": {
           "version": "2.0.4",
-          "resolved": "https://registry.npm.taobao.org/is-buffer/download/is-buffer-2.0.4.tgz",
-          "integrity": "sha1-PlcvI8hBGlz9lVfISeNmXgspBiM="
+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+          "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A=="
         }
       }
     },
@@ -1632,7 +1632,7 @@
     },
     "bezier-easing": {
       "version": "2.1.0",
-      "resolved": "https://registry.npm.taobao.org/bezier-easing/download/bezier-easing-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/bezier-easing/-/bezier-easing-2.1.0.tgz",
       "integrity": "sha1-wE3+i5JtbsrKGBPWn/F5t8ICXYY=",
       "dev": true
     },
@@ -14093,9 +14093,9 @@
       }
     },
     "vue-scrollto": {
-      "version": "2.17.1",
-      "resolved": "https://registry.npm.taobao.org/vue-scrollto/download/vue-scrollto-2.17.1.tgz",
-      "integrity": "sha1-zWLuC5jPfiup/ZTwKa3c0JOXikg=",
+      "version": "2.18.1",
+      "resolved": "https://registry.npmjs.org/vue-scrollto/-/vue-scrollto-2.18.1.tgz",
+      "integrity": "sha512-JojeVOP1Z50Jt0OCOd61jRRRF8TrNvPAzF4LAKwkTEZnt30mpDd48aDZZOEPD3l6z2PybOyUGFT/FNWfTtFv9w==",
       "dev": true,
       "requires": {
         "bezier-easing": "2.1.0"
diff --git a/packages/ncform-theme-elementui/src/components/layout-comps/array-table.vue b/packages/ncform-theme-elementui/src/components/layout-comps/array-table.vue
index a68f51a..c14492e 100755
--- a/packages/ncform-theme-elementui/src/components/layout-comps/array-table.vue
+++ b/packages/ncform-theme-elementui/src/components/layout-comps/array-table.vue
@@ -16,7 +16,7 @@
         <col v-if="showActionColumn" width="130px"/>
       </colgroup>
       <thead>
-          <th v-for="(renderSchema, idx) in renderSchemas" :key="renderSchema.ui.label" v-show="!analyzeItemVal(renderSchema.ui.hidden, idx)">
+          <th v-for="(renderSchema, idx) in renderSchemas" :key="idx" v-show="!analyzeItemVal(renderSchema.ui.hidden, idx)">
 
             <i v-if="showRequiredFlag(renderSchema.rules.required)" class="text-danger">*</i>
 
diff --git a/packages/ncform-theme-elementui/src/components/layout-comps/array-tabs.vue b/packages/ncform-theme-elementui/src/components/layout-comps/array-tabs.vue
index a38dcfa..17e4a6f 100755
--- a/packages/ncform-theme-elementui/src/components/layout-comps/array-tabs.vue
+++ b/packages/ncform-theme-elementui/src/components/layout-comps/array-tabs.vue
@@ -21,7 +21,7 @@
 
         <!-- array item 是 正常的 object 类型 -->
         <template v-if="isNormalObjSchema(dataItem.__dataSchema)">
-          <ncform-object :schema="dataItem.__dataSchema" :form-data="formData" :idx-chain="(idxChain ? idxChain + ',' : '') + idx" :config="dataItem.__dataSchema.ui.widgetConfig" :show-legend="false">
+          <ncform-object :schema="dataItem.__dataSchema" :form-data="formData" :idx-chain="(idxChain ? idxChain + ',' : '') + idx" :config="dataItem.__dataSchema.ui.widgetConfig" :global-const="globalConst" :show-legend="false">
 
             <template v-for="(fieldSchema, fieldName) in (dataItem.__dataSchema.properties || {__notObjItem: dataItem.__dataSchema})" :slot="fieldName"><!-- 注意：__notObjItem 这个Key为与form-item约定好的值，其它名字不生效 -->
               <slot :name="fieldName" :schema="fieldSchema" :idx="idx"></slot>
diff --git a/packages/ncform-theme-elementui/src/components/layout-comps/array.vue b/packages/ncform-theme-elementui/src/components/layout-comps/array.vue
index 59b411a..9e5f1ea 100755
--- a/packages/ncform-theme-elementui/src/components/layout-comps/array.vue
+++ b/packages/ncform-theme-elementui/src/components/layout-comps/array.vue
@@ -24,7 +24,7 @@
 
       <!-- array item 是 正常的 object 类型 -->
       <template v-if="isNormalObjSchema(dataItem.__dataSchema)">
-        <ncform-object v-show="mergeConfig.disableItemCollapse || dataItem.__dataSchema._expand" :schema="dataItem.__dataSchema" :form-data="formData" :idx-chain="(idxChain ? idxChain + ',' : '') + idx" :config="dataItem.__dataSchema.ui.widgetConfig" :show-legend="false">
+        <ncform-object v-show="mergeConfig.disableItemCollapse || dataItem.__dataSchema._expand" :schema="dataItem.__dataSchema" :form-data="formData" :idx-chain="(idxChain ? idxChain + ',' : '') + idx" :global-const="globalConst" :config="dataItem.__dataSchema.ui.widgetConfig" :show-legend="false">
 
           <template v-for="(fieldSchema, fieldName) in (dataItem.__dataSchema.properties || {__notObjItem: dataItem.__dataSchema})" :slot="fieldName"><!-- 注意：__notObjItem 这个Key为与form-item约定好的值，其它名字不生效 -->
             <slot :name="fieldName" :schema="fieldSchema" :idx="idx"></slot>
diff --git a/packages/ncform-theme-elementui/src/components/layout-comps/object.vue b/packages/ncform-theme-elementui/src/components/layout-comps/object.vue
index 8e21102..b9755f1 100755
--- a/packages/ncform-theme-elementui/src/components/layout-comps/object.vue
+++ b/packages/ncform-theme-elementui/src/components/layout-comps/object.vue
@@ -10,7 +10,7 @@
 
       <div v-for="(fieldSchema, field) in schema.properties"
           :key="field"
-          :class="['el-col-' + (fieldSchema.ui.columns * 2 || 24)]"
+          :class="['el-col-' + ((_analyzeVal(fieldSchema.ui.columns) || 12) * 2 || 24)]"
           :style="{display: _analyzeVal(fieldSchema.ui.hidden) ? 'none' : ''}"
           class="el-col el-form-item">
 
@@ -43,7 +43,7 @@
     <div v-if="mergeConfig.layout === 'h'" v-show="!collapsed" class="el-row h-layout" style="width: 100%">
       <div v-for="(fieldSchema, field) in schema.properties"
           :key="field"
-          :class="['el-col-' + (fieldSchema.ui.columns * 2 || 24)]"
+          :class="['el-col-' + ((_analyzeVal(fieldSchema.ui.columns) || 12) * 2 || 24)]"
           :style="{display: _analyzeVal(fieldSchema.ui.hidden) ? 'none' : ''}"
           class="el-col el-form-item">
         <template>
diff --git a/packages/ncform/conf/webpack.config.prd.js b/packages/ncform/conf/webpack.config.prd.js
index 86c531f..a69177b 100755
--- a/packages/ncform/conf/webpack.config.prd.js
+++ b/packages/ncform/conf/webpack.config.prd.js
@@ -11,6 +11,8 @@ module.exports = {
     filename: "[name].min.js",
   },
 
+  devtool: 'source-map',
+
   optimization: {
     minimize: true
   }
diff --git a/packages/ncform/examples/components/vue-ncform/_dx.html b/packages/ncform/examples/components/vue-ncform/_dx.html
index 033b57b..efe7fe0 100644
--- a/packages/ncform/examples/components/vue-ncform/_dx.html
+++ b/packages/ncform/examples/components/vue-ncform/_dx.html
@@ -209,7 +209,29 @@
                   },
                 }
               }
-            }
+            },
+            {
+              id: md5('columns dx value'),
+              title: 'columns dx value',
+              formName: 'form_' + Math.random(),
+              formSchema: {
+                type: 'object',
+                properties: {
+                  a: {
+                    default: 6,
+                    type: 'number',
+                    ui: {
+                      columns: 6
+                    }
+                  },
+                  b: {
+                    ui: {
+                      columns: 'dx: {{$root.a}}'
+                    }
+                  }
+                }
+              }
+            },
           ]
         }
       });
diff --git a/packages/ncform/examples/components/vue-ncform/_others.html b/packages/ncform/examples/components/vue-ncform/_others.html
index ce9e3e4..a5e5126 100644
--- a/packages/ncform/examples/components/vue-ncform/_others.html
+++ b/packages/ncform/examples/components/vue-ncform/_others.html
@@ -137,10 +137,11 @@
           changeModel(formSchema) {
             formSchema.value = { user: { name: 'daniel' } };
           },
-          onChange({paths, itemValue, formValue}) {
+          onChange({paths, itemValue, formValue, itemOldValue}) {
             console.log('paths:', paths);
             console.log('itemValue:', itemValue);
             console.log('formValue:', JSON.stringify(formValue, null, 2));
+            console.log('itemOldValue', itemOldValue);
           }
         }
       });
diff --git a/packages/ncform/package-lock.json b/packages/ncform/package-lock.json
index 3ddcd89..5dca84c 100755
--- a/packages/ncform/package-lock.json
+++ b/packages/ncform/package-lock.json
@@ -61,18 +61,6 @@
         }
       }
     },
-    "@ncform/ncform-common": {
-      "version": "1.6.6",
-      "resolved": "https://registry.npm.taobao.org/@ncform/ncform-common/download/@ncform/ncform-common-1.6.6.tgz",
-      "integrity": "sha1-HXpaF5iGPiAR+fIVIzJgTgX0o0w=",
-      "requires": {
-        "assert": "^1.4.1",
-        "axios": "^0.18.0",
-        "extend": "^3.0.1",
-        "lodash-es": "^4.17.4",
-        "power-assert": "^1.4.4"
-      }
-    },
     "@types/q": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/@types/q/-/q-1.5.2.tgz",
@@ -127,7 +115,8 @@
     "acorn-es7-plugin": {
       "version": "1.1.7",
       "resolved": "http://registry.npm.taobao.org/acorn-es7-plugin/download/acorn-es7-plugin-1.1.7.tgz",
-      "integrity": "sha1-8u4fMiipDurRJF+asZIusucdM2s="
+      "integrity": "sha1-8u4fMiipDurRJF+asZIusucdM2s=",
+      "dev": true
     },
     "acorn-globals": {
       "version": "4.3.0",
@@ -405,7 +394,8 @@
     "array-filter": {
       "version": "1.0.0",
       "resolved": "http://registry.npm.taobao.org/array-filter/download/array-filter-1.0.0.tgz",
-      "integrity": "sha1-uveeYubvTCpMC4MSMtr/7CUfnYM="
+      "integrity": "sha1-uveeYubvTCpMC4MSMtr/7CUfnYM=",
+      "dev": true
     },
     "array-find-index": {
       "version": "1.0.2",
@@ -515,6 +505,7 @@
       "version": "1.4.1",
       "resolved": "http://registry.npm.taobao.org/assert/download/assert-1.4.1.tgz",
       "integrity": "sha1-mZEtWRg2tab1s0XA8H7vwI/GXZE=",
+      "dev": true,
       "requires": {
         "util": "0.10.3"
       }
@@ -1103,7 +1094,8 @@
     "call-signature": {
       "version": "0.0.2",
       "resolved": "http://registry.npm.taobao.org/call-signature/download/call-signature-0.0.2.tgz",
-      "integrity": "sha1-qEq8glpV70yysCi9dOIFpluaSZY="
+      "integrity": "sha1-qEq8glpV70yysCi9dOIFpluaSZY=",
+      "dev": true
     },
     "callsite": {
       "version": "1.0.0",
@@ -1754,7 +1746,8 @@
     "core-js": {
       "version": "2.5.1",
       "resolved": "http://registry.npm.taobao.org/core-js/download/core-js-2.5.1.tgz",
-      "integrity": "sha1-rmh03GaTd4m4B1T/VCjfZoGcpQs="
+      "integrity": "sha1-rmh03GaTd4m4B1T/VCjfZoGcpQs=",
+      "dev": true
     },
     "core-util-is": {
       "version": "1.0.2",
@@ -2237,6 +2230,7 @@
       "version": "1.1.2",
       "resolved": "http://registry.npm.taobao.org/define-properties/download/define-properties-1.1.2.tgz",
       "integrity": "sha1-g6c/L+pWmJj7c3GTyPhzyvbUXJQ=",
+      "dev": true,
       "requires": {
         "foreach": "^2.0.5",
         "object-keys": "^1.0.8"
@@ -2361,7 +2355,8 @@
     "diff-match-patch": {
       "version": "1.0.0",
       "resolved": "http://registry.npm.taobao.org/diff-match-patch/download/diff-match-patch-1.0.0.tgz",
-      "integrity": "sha1-HMPIOkkNZ/ldkeOfatHy4Ia2MEg="
+      "integrity": "sha1-HMPIOkkNZ/ldkeOfatHy4Ia2MEg=",
+      "dev": true
     },
     "diffie-hellman": {
       "version": "5.0.2",
@@ -2510,7 +2505,8 @@
     "eastasianwidth": {
       "version": "0.1.1",
       "resolved": "http://registry.npm.taobao.org/eastasianwidth/download/eastasianwidth-0.1.1.tgz",
-      "integrity": "sha1-RNZW3p2kFWlEZzNTZfsxR7hXK3w="
+      "integrity": "sha1-RNZW3p2kFWlEZzNTZfsxR7hXK3w=",
+      "dev": true
     },
     "easy-extender": {
       "version": "2.3.4",
@@ -2583,6 +2579,7 @@
       "version": "1.2.3",
       "resolved": "http://registry.npm.taobao.org/empower/download/empower-1.2.3.tgz",
       "integrity": "sha1-bw2nNEf07dg4/sXGAxOoi6XLhSs=",
+      "dev": true,
       "requires": {
         "core-js": "^2.0.0",
         "empower-core": "^0.6.2"
@@ -2592,6 +2589,7 @@
       "version": "0.6.2",
       "resolved": "http://registry.npm.taobao.org/empower-core/download/empower-core-0.6.2.tgz",
       "integrity": "sha1-Wt71ZgiOMfuoC6CjbfR9cJQWkUQ=",
+      "dev": true,
       "requires": {
         "call-signature": "0.0.2",
         "core-js": "^2.0.0"
@@ -3136,6 +3134,7 @@
       "version": "1.7.0",
       "resolved": "http://registry.npm.taobao.org/espurify/download/espurify-1.7.0.tgz",
       "integrity": "sha1-HFz2y8zDLm9jk4C9T5kfq5up0iY=",
+      "dev": true,
       "requires": {
         "core-js": "^2.0.0"
       }
@@ -3161,7 +3160,8 @@
     "estraverse": {
       "version": "4.2.0",
       "resolved": "http://registry.npm.taobao.org/estraverse/download/estraverse-4.2.0.tgz",
-      "integrity": "sha1-De4/7TH81GlhjOc0IJn8GvoL2xM="
+      "integrity": "sha1-De4/7TH81GlhjOc0IJn8GvoL2xM=",
+      "dev": true
     },
     "esutils": {
       "version": "2.0.2",
@@ -3799,7 +3799,8 @@
     "foreach": {
       "version": "2.0.5",
       "resolved": "http://registry.npm.taobao.org/foreach/download/foreach-2.0.5.tgz",
-      "integrity": "sha1-C+4AUBiusmDQo6865ljdATbsG5k="
+      "integrity": "sha1-C+4AUBiusmDQo6865ljdATbsG5k=",
+      "dev": true
     },
     "forever-agent": {
       "version": "0.6.1",
@@ -3884,8 +3885,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "delegates": "1.0.0",
-            "readable-stream": "2.3.6"
+            "delegates": "^1.0.0",
+            "readable-stream": "^2.0.6"
           }
         },
         "balanced-match": {
@@ -3900,7 +3901,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "balanced-match": "1.0.0",
+            "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
           }
         },
@@ -3967,7 +3968,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "minipass": "2.3.5"
+            "minipass": "^2.2.1"
           }
         },
         "fs.realpath": {
@@ -3982,14 +3983,14 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "aproba": "1.2.0",
-            "console-control-strings": "1.1.0",
-            "has-unicode": "2.0.1",
-            "object-assign": "4.1.1",
-            "signal-exit": "3.0.2",
-            "string-width": "1.0.2",
-            "strip-ansi": "3.0.1",
-            "wide-align": "1.1.3"
+            "aproba": "^1.0.3",
+            "console-control-strings": "^1.0.0",
+            "has-unicode": "^2.0.0",
+            "object-assign": "^4.1.0",
+            "signal-exit": "^3.0.0",
+            "string-width": "^1.0.1",
+            "strip-ansi": "^3.0.1",
+            "wide-align": "^1.1.0"
           }
         },
         "glob": {
@@ -3998,12 +3999,12 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "fs.realpath": "1.0.0",
-            "inflight": "1.0.6",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
           }
         },
         "has-unicode": {
@@ -4018,7 +4019,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "safer-buffer": "2.1.2"
+            "safer-buffer": ">= 2.1.2 < 3"
           }
         },
         "ignore-walk": {
@@ -4027,7 +4028,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "minimatch": "3.0.4"
+            "minimatch": "^3.0.4"
           }
         },
         "inflight": {
@@ -4036,8 +4037,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "once": "1.4.0",
-            "wrappy": "1.0.2"
+            "once": "^1.3.0",
+            "wrappy": "1"
           }
         },
         "inherits": {
@@ -4058,7 +4059,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
           }
         },
         "isarray": {
@@ -4073,7 +4074,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "brace-expansion": "1.1.11"
+            "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
@@ -4088,8 +4089,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "safe-buffer": "5.1.2",
-            "yallist": "3.0.3"
+            "safe-buffer": "^5.1.2",
+            "yallist": "^3.0.0"
           }
         },
         "minizlib": {
@@ -4098,7 +4099,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "minipass": "2.3.5"
+            "minipass": "^2.2.1"
           }
         },
         "mkdirp": {
@@ -4122,9 +4123,9 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "debug": "2.6.9",
-            "iconv-lite": "0.4.24",
-            "sax": "1.2.4"
+            "debug": "^2.1.2",
+            "iconv-lite": "^0.4.4",
+            "sax": "^1.2.4"
           }
         },
         "node-pre-gyp": {
@@ -4133,16 +4134,16 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "detect-libc": "1.0.3",
-            "mkdirp": "0.5.1",
-            "needle": "2.2.4",
-            "nopt": "4.0.1",
-            "npm-packlist": "1.2.0",
-            "npmlog": "4.1.2",
-            "rc": "1.2.8",
-            "rimraf": "2.6.3",
-            "semver": "5.6.0",
-            "tar": "4.4.8"
+            "detect-libc": "^1.0.2",
+            "mkdirp": "^0.5.1",
+            "needle": "^2.2.1",
+            "nopt": "^4.0.1",
+            "npm-packlist": "^1.1.6",
+            "npmlog": "^4.0.2",
+            "rc": "^1.2.7",
+            "rimraf": "^2.6.1",
+            "semver": "^5.3.0",
+            "tar": "^4"
           }
         },
         "nopt": {
@@ -4151,8 +4152,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "abbrev": "1.1.1",
-            "osenv": "0.1.5"
+            "abbrev": "1",
+            "osenv": "^0.1.4"
           }
         },
         "npm-bundled": {
@@ -4167,8 +4168,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "ignore-walk": "3.0.1",
-            "npm-bundled": "1.0.5"
+            "ignore-walk": "^3.0.1",
+            "npm-bundled": "^1.0.1"
           }
         },
         "npmlog": {
@@ -4177,10 +4178,10 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "are-we-there-yet": "1.1.5",
-            "console-control-strings": "1.1.0",
-            "gauge": "2.7.4",
-            "set-blocking": "2.0.0"
+            "are-we-there-yet": "~1.1.2",
+            "console-control-strings": "~1.1.0",
+            "gauge": "~2.7.3",
+            "set-blocking": "~2.0.0"
           }
         },
         "number-is-nan": {
@@ -4201,7 +4202,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "wrappy": "1.0.2"
+            "wrappy": "1"
           }
         },
         "os-homedir": {
@@ -4222,8 +4223,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "os-homedir": "1.0.2",
-            "os-tmpdir": "1.0.2"
+            "os-homedir": "^1.0.0",
+            "os-tmpdir": "^1.0.0"
           }
         },
         "path-is-absolute": {
@@ -4244,10 +4245,10 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "deep-extend": "0.6.0",
-            "ini": "1.3.5",
-            "minimist": "1.2.0",
-            "strip-json-comments": "2.0.1"
+            "deep-extend": "^0.6.0",
+            "ini": "~1.3.0",
+            "minimist": "^1.2.0",
+            "strip-json-comments": "~2.0.1"
           },
           "dependencies": {
             "minimist": {
@@ -4264,13 +4265,13 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "core-util-is": "1.0.2",
-            "inherits": "2.0.3",
-            "isarray": "1.0.0",
-            "process-nextick-args": "2.0.0",
-            "safe-buffer": "5.1.2",
-            "string_decoder": "1.1.1",
-            "util-deprecate": "1.0.2"
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
           }
         },
         "rimraf": {
@@ -4279,7 +4280,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "glob": "7.1.3"
+            "glob": "^7.1.3"
           }
         },
         "safe-buffer": {
@@ -4324,9 +4325,9 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
           }
         },
         "string_decoder": {
@@ -4335,7 +4336,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "safe-buffer": "5.1.2"
+            "safe-buffer": "~5.1.0"
           }
         },
         "strip-ansi": {
@@ -4344,7 +4345,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^2.0.0"
           }
         },
         "strip-json-comments": {
@@ -4359,13 +4360,13 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "chownr": "1.1.1",
-            "fs-minipass": "1.2.5",
-            "minipass": "2.3.5",
-            "minizlib": "1.2.1",
-            "mkdirp": "0.5.1",
-            "safe-buffer": "5.1.2",
-            "yallist": "3.0.3"
+            "chownr": "^1.1.1",
+            "fs-minipass": "^1.2.5",
+            "minipass": "^2.3.4",
+            "minizlib": "^1.1.1",
+            "mkdirp": "^0.5.0",
+            "safe-buffer": "^5.1.2",
+            "yallist": "^3.0.2"
           }
         },
         "util-deprecate": {
@@ -4380,7 +4381,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "string-width": "1.0.2"
+            "string-width": "^1.0.2 || 2"
           }
         },
         "wrappy": {
@@ -5383,7 +5384,8 @@
     "indexof": {
       "version": "0.0.1",
       "resolved": "http://registry.npm.taobao.org/indexof/download/indexof-0.0.1.tgz",
-      "integrity": "sha1-gtwzbSMrkGIXnQWrMpOmYFn9Q10="
+      "integrity": "sha1-gtwzbSMrkGIXnQWrMpOmYFn9Q10=",
+      "dev": true
     },
     "inflight": {
       "version": "1.0.6",
@@ -7581,7 +7583,8 @@
     "object-keys": {
       "version": "1.0.11",
       "resolved": "http://registry.npm.taobao.org/object-keys/download/object-keys-1.0.11.tgz",
-      "integrity": "sha1-xUYBd4rVYPEULODgG8yotW0TQm0="
+      "integrity": "sha1-xUYBd4rVYPEULODgG8yotW0TQm0=",
+      "dev": true
     },
     "object-path": {
       "version": "0.9.2",
@@ -8964,6 +8967,7 @@
       "version": "1.4.4",
       "resolved": "http://registry.npm.taobao.org/power-assert/download/power-assert-1.4.4.tgz",
       "integrity": "sha1-kpXqdDcZb1pgH95CDwQmMRhtdRc=",
+      "dev": true,
       "requires": {
         "define-properties": "^1.1.2",
         "empower": "^1.2.3",
@@ -8976,6 +8980,7 @@
       "version": "1.1.1",
       "resolved": "http://registry.npm.taobao.org/power-assert-context-formatter/download/power-assert-context-formatter-1.1.1.tgz",
       "integrity": "sha1-7bo1LT7YpgMRTWZyZazOYNaJzN8=",
+      "dev": true,
       "requires": {
         "core-js": "^2.0.0",
         "power-assert-context-traversal": "^1.1.1"
@@ -8985,6 +8990,7 @@
       "version": "1.1.2",
       "resolved": "http://registry.npm.taobao.org/power-assert-context-reducer-ast/download/power-assert-context-reducer-ast-1.1.2.tgz",
       "integrity": "sha1-SEqZ4m9Jc/+IMuXFzHVnAuYJQXQ=",
+      "dev": true,
       "requires": {
         "acorn": "^4.0.0",
         "acorn-es7-plugin": "^1.0.12",
@@ -8996,7 +9002,8 @@
         "acorn": {
           "version": "4.0.13",
           "resolved": "http://registry.npm.taobao.org/acorn/download/acorn-4.0.13.tgz",
-          "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c="
+          "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c=",
+          "dev": true
         }
       }
     },
@@ -9004,6 +9011,7 @@
       "version": "1.1.1",
       "resolved": "http://registry.npm.taobao.org/power-assert-context-traversal/download/power-assert-context-traversal-1.1.1.tgz",
       "integrity": "sha1-iMq8oNE7Y1nwfT0+ivppkmRXftk=",
+      "dev": true,
       "requires": {
         "core-js": "^2.0.0",
         "estraverse": "^4.1.0"
@@ -9013,6 +9021,7 @@
       "version": "1.4.1",
       "resolved": "http://registry.npm.taobao.org/power-assert-formatter/download/power-assert-formatter-1.4.1.tgz",
       "integrity": "sha1-XcEl7VCj37HdomwZNH879Y7CiEo=",
+      "dev": true,
       "requires": {
         "core-js": "^2.0.0",
         "power-assert-context-formatter": "^1.0.7",
@@ -9027,6 +9036,7 @@
       "version": "1.1.1",
       "resolved": "http://registry.npm.taobao.org/power-assert-renderer-assertion/download/power-assert-renderer-assertion-1.1.1.tgz",
       "integrity": "sha1-y/wOd+AIao+Wrz8djme57n4ozpg=",
+      "dev": true,
       "requires": {
         "power-assert-renderer-base": "^1.1.1",
         "power-assert-util-string-width": "^1.1.1"
@@ -9035,12 +9045,14 @@
     "power-assert-renderer-base": {
       "version": "1.1.1",
       "resolved": "http://registry.npm.taobao.org/power-assert-renderer-base/download/power-assert-renderer-base-1.1.1.tgz",
-      "integrity": "sha1-lqZQxv0F7hvB9mtUrWFELIs/Y+s="
+      "integrity": "sha1-lqZQxv0F7hvB9mtUrWFELIs/Y+s=",
+      "dev": true
     },
     "power-assert-renderer-comparison": {
       "version": "1.1.1",
       "resolved": "http://registry.npm.taobao.org/power-assert-renderer-comparison/download/power-assert-renderer-comparison-1.1.1.tgz",
       "integrity": "sha1-10Odl9hRVr5OMKAPL7WnJRTOPAg=",
+      "dev": true,
       "requires": {
         "core-js": "^2.0.0",
         "diff-match-patch": "^1.0.0",
@@ -9053,6 +9065,7 @@
       "version": "1.1.2",
       "resolved": "http://registry.npm.taobao.org/power-assert-renderer-diagram/download/power-assert-renderer-diagram-1.1.2.tgz",
       "integrity": "sha1-ZV+PcRk1qbbVQbhjJ2VHF8Y3qYY=",
+      "dev": true,
       "requires": {
         "core-js": "^2.0.0",
         "power-assert-renderer-base": "^1.1.1",
@@ -9064,6 +9077,7 @@
       "version": "1.1.1",
       "resolved": "http://registry.npm.taobao.org/power-assert-renderer-file/download/power-assert-renderer-file-1.1.1.tgz",
       "integrity": "sha1-o34rvReMys0E5427eckv40kzxec=",
+      "dev": true,
       "requires": {
         "power-assert-renderer-base": "^1.1.1"
       }
@@ -9072,6 +9086,7 @@
       "version": "1.1.1",
       "resolved": "http://registry.npm.taobao.org/power-assert-util-string-width/download/power-assert-util-string-width-1.1.1.tgz",
       "integrity": "sha1-vmWet5N/3S5smncmjar2S9W3xZI=",
+      "dev": true,
       "requires": {
         "eastasianwidth": "^0.1.1"
       }
@@ -11140,6 +11155,7 @@
       "version": "1.3.0",
       "resolved": "http://registry.npm.taobao.org/stringifier/download/stringifier-1.3.0.tgz",
       "integrity": "sha1-3vGDQvaTPbDy2/yaoCF1tEjBeVk=",
+      "dev": true,
       "requires": {
         "core-js": "^2.0.0",
         "traverse": "^0.6.6",
@@ -12122,7 +12138,8 @@
     "traverse": {
       "version": "0.6.6",
       "resolved": "http://registry.npm.taobao.org/traverse/download/traverse-0.6.6.tgz",
-      "integrity": "sha1-y99WD9e5r2MlAv7UD5GMFX6pcTc="
+      "integrity": "sha1-y99WD9e5r2MlAv7UD5GMFX6pcTc=",
+      "dev": true
     },
     "trim-newlines": {
       "version": "1.0.0",
@@ -12190,7 +12207,8 @@
     "type-name": {
       "version": "2.0.2",
       "resolved": "http://registry.npm.taobao.org/type-name/download/type-name-2.0.2.tgz",
-      "integrity": "sha1-7+fUEj2KxSr/9/QMfk3sUmYAj7Q="
+      "integrity": "sha1-7+fUEj2KxSr/9/QMfk3sUmYAj7Q=",
+      "dev": true
     },
     "typedarray": {
       "version": "0.0.6",
@@ -12363,6 +12381,7 @@
       "version": "1.2.2",
       "resolved": "http://registry.npm.taobao.org/universal-deep-strict-equal/download/universal-deep-strict-equal-1.2.2.tgz",
       "integrity": "sha1-DaSsL3PP95JMgfpN4BjKViyisKc=",
+      "dev": true,
       "requires": {
         "array-filter": "^1.0.0",
         "indexof": "0.0.1",
@@ -12550,6 +12569,7 @@
       "version": "0.10.3",
       "resolved": "http://registry.npm.taobao.org/util/download/util-0.10.3.tgz",
       "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+      "dev": true,
       "requires": {
         "inherits": "2.0.1"
       },
@@ -12557,7 +12577,8 @@
         "inherits": {
           "version": "2.0.1",
           "resolved": "http://registry.npm.taobao.org/inherits/download/inherits-2.0.1.tgz",
-          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE="
+          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
+          "dev": true
         }
       }
     },
@@ -13063,7 +13084,8 @@
     "xtend": {
       "version": "4.0.1",
       "resolved": "http://registry.npm.taobao.org/xtend/download/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
     },
     "y18n": {
       "version": "3.2.1",
diff --git a/packages/ncform/src/components/vue-ncform/form-item.vue b/packages/ncform/src/components/vue-ncform/form-item.vue
index 22a5bfa..d1a41e3 100755
--- a/packages/ncform/src/components/vue-ncform/form-item.vue
+++ b/packages/ncform/src/components/vue-ncform/form-item.vue
@@ -282,7 +282,8 @@ export default {
             formVM.$emit('change', {
               paths: this.paths,
               itemValue: this.schema.value,
-              formValue: this.formData
+              formValue: this.formData,
+              itemOldValue: this.$data.itemValue
             })
           }
 
diff --git a/packages/ncform/src/components/vue-ncform/layout-comps/array-table.vue b/packages/ncform/src/components/vue-ncform/layout-comps/array-table.vue
index 2ffefe9..48acb95 100755
--- a/packages/ncform/src/components/vue-ncform/layout-comps/array-table.vue
+++ b/packages/ncform/src/components/vue-ncform/layout-comps/array-table.vue
@@ -14,7 +14,7 @@
       </colgroup>
       <thead>
         <tr>
-          <th v-for="(renderSchema, idx) in renderSchemas" :key="renderSchema.ui.label" v-show="!analyzeItemVal(renderSchema.ui.hidden, idx)">
+          <th v-for="(renderSchema, idx) in renderSchemas" :key="idx" v-show="!analyzeItemVal(renderSchema.ui.hidden, idx)">
 
             <i v-if="showRequiredFlag(renderSchema.rules.required)" class="text-danger">*</i>
 
diff --git a/packages/ncform/src/components/vue-ncform/layout-comps/array.vue b/packages/ncform/src/components/vue-ncform/layout-comps/array.vue
index 15d4e13..e5841e9 100755
--- a/packages/ncform/src/components/vue-ncform/layout-comps/array.vue
+++ b/packages/ncform/src/components/vue-ncform/layout-comps/array.vue
@@ -19,7 +19,7 @@
 
       <!-- array item 是 正常的 object 类型 -->
       <template v-if="isNormalObjSchema(dataItem.__dataSchema)">
-        <ncform-object v-show="mergeConfig.disableItemCollapse || dataItem.__dataSchema._expand" :schema="dataItem.__dataSchema" :form-data="formData" :idx-chain="(idxChain ? idxChain + ',' : '') + idx" :config="dataItem.__dataSchema.ui.widgetConfig" :show-legend="false">
+        <ncform-object v-show="mergeConfig.disableItemCollapse || dataItem.__dataSchema._expand" :schema="dataItem.__dataSchema" :form-data="formData" :idx-chain="(idxChain ? idxChain + ',' : '') + idx" :config="dataItem.__dataSchema.ui.widgetConfig" :global-const="globalConst" :show-legend="false">
 
           <!-- 注意：__notObjItem 这个Key为与form-item约定好的值，其它名字不生效 -->
           <template v-for="(fieldSchema, fieldName) in (dataItem.__dataSchema.properties || {__notObjItem: dataItem.__dataSchema})" :slot="fieldName">
diff --git a/packages/ncform/src/components/vue-ncform/layout-comps/object.vue b/packages/ncform/src/components/vue-ncform/layout-comps/object.vue
index 604792c..0c43a6a 100755
--- a/packages/ncform/src/components/vue-ncform/layout-comps/object.vue
+++ b/packages/ncform/src/components/vue-ncform/layout-comps/object.vue
@@ -6,7 +6,7 @@
     <div v-if="mergeConfig.layout === 'v'" v-show="!collapsed" class="form-row v-layout" style="width: 100%">
       <div v-for="(fieldSchema, field) in schema.properties"
           :key="field"
-          :class="['col-md-' + (fieldSchema.ui.columns || 12)]"
+          :class="['col-md-' + (_analyzeVal(fieldSchema.ui.columns) || 12)]"
           :style="{display: _analyzeVal(fieldSchema.ui.hidden) ? 'none' : ''}"
           class="form-group">
         <template>
@@ -34,7 +34,7 @@
     <div v-if="mergeConfig.layout === 'h'" v-show="!collapsed" class="form-row h-layout" style="width: 100%">
       <div v-for="(fieldSchema, field) in schema.properties"
           :key="field"
-          :class="['col-md-' + (fieldSchema.ui.columns || 12)]"
+          :class="['col-md-' + (_analyzeVal(fieldSchema.ui.columns) || 12)]"
           :style="{display: _analyzeVal(fieldSchema.ui.hidden) ? 'none' : ''}"
           class="form-group row">
         <template>