用DomSanitizer清理Angular 4中的Blob Url

import { Component } from '@angular/core';
import { DomSanitizer, SafeUrl } from '@angular/platform-browser';

@Component({
  selector: 'app-example',
  template: `
    <a [href]="cleanedUrl" download="file.txt">Download File</a>
  `
})
export class ExampleComponent {
  blobUrl: string = 'blob:http://example.com/12345';
  cleanedUrl: SafeUrl;

  constructor(private sanitizer: DomSanitizer) {
    this.cleanedUrl = this.sanitizer.bypassSecurityTrustUrl(this.blobUrl);
  }
}