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Angular8使用Ant Design Mobile 的List 提示 Can't bind to 'ngModel' since it isn't a known property of 'ListItem'，具体错误如下：
```js
core.js:6014 ERROR Error: Uncaught (in promise): Error: Template parse errors:
Can't bind to 'ngModel' since it isn't a known property of 'ListItem'. ("
                [arrow]="'horizontal'"
                [mode]="'date'"
                [ERROR ->][(ngModel)]="value"
                (onOk)="onOk($event)"
              >
"): ng:///KeepbookModule/IndexComponent.html@55:16
Error: Template parse errors:
Can't bind to 'ngModel' since it isn't a known property of 'ListItem'. ("
                [arrow]="'horizontal'"
                [mode]="'date'"
                [ERROR ->][(ngModel)]="value"
                (onOk)="onOk($event)"
              >
"): ng:///KeepbookModule/IndexComponent.html@55:16
    at syntaxError (compiler.js:2175)
    at TemplateParser.parse (compiler.js:11388)
    at JitCompiler._parseTemplate (compiler.js:25963)
    at JitCompiler._compileTemplate (compiler.js:25951)
    at compiler.js:25895
    at Set.forEach (<anonymous>)
    at JitCompiler._compileComponents (compiler.js:25895)
    at compiler.js:25808
    at Object.then (compiler.js:2166)
    at JitCompiler._compileModuleAndComponents (compiler.js:25807)
    at resolvePromise (zone-evergreen.js:797)
    at resolvePromise (zone-evergreen.js:754)
    at zone-evergreen.js:858
    at ZoneDelegate.invokeTask (zone-evergreen.js:391)
    at Object.onInvokeTask (core.js:39680)
    at ZoneDelegate.invokeTask (zone-evergreen.js:390)
    at Zone.runTask (zone-evergreen.js:168)
    at drainMicroTaskQueue (zone-evergreen.js:559)
```
#### 解决办法
在对应的module里面导入FormsModule
```
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

import { KeepbookRoutingModule } from './keepbook-routing.module';
import { IndexComponent } from './index/index.component';
import { NgZorroAntdMobileModule } from 'ng-zorro-antd-mobile';
import { FormsModule } from '@angular/forms';//导入此module
@NgModule({
  declarations: [IndexComponent],
  imports: [
    CommonModule,
    FormsModule,//imports
    KeepbookRoutingModule,
    NgZorroAntdMobileModule
  ]
})
export class KeepbookModule { }
```