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Angular 4路由器返回undefined

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我尝试使用 Router.navigate({}) 创建一个函数
导入路由器:
import { Router } from '@angular/router';
具有函数和构造函数的类:

export class HomeComponent implements OnInit {
  constructor(private router:Router,private renderer: Renderer2,public but2: ElementRef, public but1: ElementRef) {
  }

  ngOnInit() {
  }
  nvgt(lc){
    this.router.navigate([ lc ]);
  }
  navigator(loc) {
  this.renderer.setStyle(this.but1.nativeElement.querySelector('#but1'),'animation','fadeoutdown 1s both');
  this.renderer.setStyle(this.but2.nativeElement.querySelector('#but2'),'animation','fadeoutup 1s both');
  window.setInterval(this.nvgt,1500,loc)
  }
}

组件HTML(2个按钮):

<button #but1 id="but1" (click)="navigator('/questions')" mat-raised-button>Search for my next phone</button>
<hr data-content="OR">
<button #but2 id="but2" (click)="navigate('/inputphone')" mat-raised-button>Search specific phone</button>

当我单击控制台中发现的下一个错误时:

ERROR TypeError:无法在HomeComponent.nvgt中读取未定义的属性'navigate'(webpack-internal:///../../../../../src/app/home/home.component.ts :25)at.DevokeTask(webpack-internal:///../../../../ zone.js /../../../core/esm5/core.js:4940)在ZoneDelegate.invokeTask(webpack-internal:///../../../../zone.js/dist/ zone.run:420)在ZoneTask.invokeTask(webpack-internal)的Zone.runTask(webpack-internal:///../../../../zone.js/dist/zone.js:188) :///../../../../zone.js/dist/zone.js:495)在ZoneTask.invoke(webpack-internal:///../../../ . ./zone.js/dist/zone.js:484)在计时器(webpack-internal:///../../../../zone.js/dist/zone.js:2065)

谢谢你的帮助!

2 回答

  • 1

    你已经失去了对 this 的引用,这是JS中许多人的典型问题 . 改变这一行:

    window.setInterval(this.nvgt,1500,loc)
    

    window.setInterval(() => this.nvgt(loc),1500)
    

    你看,lambdas没有上下文,不像典型的js函数(你在代码中传递一个方法的引用),而是坚持它们被调用的上下文(一个类或另一个函数) .

  • 1

    btn2 点击功能应为 navigator

    <button #but2 id="but2" (click)="navigator('/inputphone')" mat-raised-button>Search specific phone</button>
    

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