Angular2 Base64 清理不安全的 URL 值

来self 的服务器的响应如下所示:

[{"coreGoalId":1,"title":"Core goal 1","infrastructure":"Sample Infrastructure","audience":"People","subGoals":null,"benefits":[{"benefitId":1,"what":"string","coreGoalId":1}],"effects":null,"steps":null,"images":[{"imagelId":1,"base64":"/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcU\nFhYaHSUfGhsjHBYWICwgIyYnKSopGR8tMC0oMCUoKSj/2wBDAQcHBwoIChMKChMoGhYaKCgoKCgo\nKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCj/wgARCAIWAe4DASIA\nAhEBAxEB/8QAHAABAAIDAQEB"}]}]

我正在try 显示其中返回的base64图像.

在我的组件中:

ngOnInit() {

    this.homeService.getGoals()
    .subscribe(
        goals => this.coreGoals = goals,
        error =>  this.errorMessage = <any>error);
}

然后在模板中:

<ul>
    <li *ngFor="let goal of coreGoals">
        {{goal.title}}
        <img [src]="'data:image/jpg;base64,'+goal.images[0].base64 | safeHtml" />
    </li>
</ul> 

其中safeHtml是我创建的管道，如下所示:

import { Pipe } from '@angular/core';
import { DomSanitizer } from '@angular/platform-browser';

@Pipe({name: 'safeHtml'})
export class SafeHtml {
  constructor(private sanitizer:DomSanitizer){}

  transform(html) {
    return this.sanitizer.bypassSecurityTrustHtml(html);
  }
}

这给了我Required a safe URL, got a HTML个错误.这里出了什么问题？如果我从<img />中删除管道，那么它会显示不安全的url.