Ng2.x 常见错误总结。
1.EXCEPTION:... caused by: If ngModel is used within a form tag, either the name attribute must be set or the form control must be defined as 'standalone' in ngModelOptions.
原因：Angular2规定，当在表单中使用 [(ngModel)] 时，必须要定义 name 属性。没有name属性就会报上面的错误
解决办法：给表单标记添加name属性即可
2.加载的模板不显示 Error: Uncaught (in promise): Failed to load xxx.html
moduleId - ES/CommonJS module id of the file in which this component is defined
@Component({
moduleId: module.id, //加上这句就可以了
selector: 'xxx-xxx',
templateUrl: 'xxx.component.html' //外部模板
})
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