Angular2 Base64清理不安全的URL值

[{"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/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUnFhYaHSUfGhsjHBYWICwgIyYnKSopGR8tMC0oMCUoKSj/2wBDAQcHBwoIChMKChMoGhYaKCgoKCgonKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCj/wgARCAIWAe4DASIAnAhEBAxEB/8QAHAABAAIDAQEB"}]}]

我正在尝试显示其中返回的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>

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);
  }
}

这给了我一个安全的URL,得到了一个HTML错误.这里出了什么问题？如果我从< img />中删除管道然后它说不安全的网址.