angular – 什么是数据绑定属性？

发布时间：2020-12-17 07:51:15 所属栏目：安全来源：网络整理

导读：我试图理解angular2中的OnInit功能并阅读文档： Description Implement this interface to execute custom initialization logic after your directive’s data-bound properties have been initialized. ngOnInit is called right after the directive’s d

我试图理解angular2中的OnInit功能并阅读文档：

Description

Implement this interface to execute custom initialization logic after
your directive’s data-bound properties have been initialized.

ngOnInit is called right after the directive’s data-bound properties
have been checked for the first time,and before any of its children
have been checked. It is invoked only once when the directive is
instantiated.

我不明白指令的数据绑定属性是什么意思？

当你有一个组件

@Component({
  selector: 'my-component'
})
class MyComponent {
  @Input() name:string;

  ngOnChanges(changes) {
  }

  ngOnInit() {
  }
}

你可以像使用它一样

<my-component [name]="somePropInParent"></my-component>

这使名称成为数据绑定属性.

更改somePropInParent的值时,Angulars更改检测更新名称并调用ngOnChanges()

在第一次调用ngOnChanges()之后,调用ngOnInit()一次,以指示解析并应用了初始绑定([name] =“somePropInParent”).

有关详细信息,请参阅https://angular.io/docs/ts/latest/cookbook/component-communication.html

（编辑：李大同）

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