如何使用角4中的Meta删除标记

Question

我可以在index.html中动态设置标签,角度为4的元概念.但是当我尝试删除标签时,没有删除,我怎样才能删除之前添加的标签？

这是我尝试过的:设置标签:

import {Meta ,MetaDefinition } from '@angular/platform-browser';
@Component({
  selector: 'app-share-video',
  templateUrl: './share-video.component.html',
  })
export class ShareVideoComponent implements OnInit {
constructor(public metaServic:Meta){}
ngOnInit(){
    const ogtitle: MetaDefinition   =  { name: 'og:title', content: 'Grace' };
    const ogSitename: MetaDefinition = { name: 'og:site_name', content: 'My Favourite Albums'};
    const ogUrl: MetaDefinition = { name: 'og:url', content: 'https://angular.io/docs/ts/latest/api/platform-browser/index/Meta-class.html'};
    const ogdesc: MetaDefinition = { name: 'og:description', content: 'angular 4 share video description'};
    this.metaService.addTag(ogtitle);
    this.metaService.addTag(ogSitename);
    this.metaService.addTag(ogUrl);
    this.metaService.addTag(ogdesc);
  }        
ngOnDestroy() {
   this.metaService.removeTag("property='og:title'");
   this.metaService.removeTag("property='og:site_name'");
   this.metaService.removeTag("property='og:url'");
   this.metaService.removeTag("property='og:description'");
    }
}

在destroy方法中,我删除了标签,但这些标签没有删除,我该如何删除标签？紧随其后:meta标签博客

Answer 1

您尝试使用的属性选择器name不是property.

你必须使用

this.metaService.removeTag("name='og:title'");
this.metaService.removeTag("name='og:site_name'");
this.metaService.removeTag("name='og:url'");
this.metaService.removeTag("name='og:description'");

代替

this.metaService.removeTag("property='og:title'");
this.metaService.removeTag("property='og:site_name'");
this.metaService.removeTag("property='og:url'");
this.metaService.removeTag("property='og:description'");

plnkr