<iframe src="URL"></iframe>

<iframe src="demo_iframe.htm" name="iframe_a"></iframe>
<p><a href="http://www.w3school.com.cn" target="iframe_a">W3School.com.cn</a></p>

<iframe height="500px" width="100%" name="iframe_work"></iframe>
<p><a target="iframe_work" style="display: none"
[href]="protocol + '//' + (this.work.student.no + '.' + host + '/' + getWorkDir()) | safeUrl"
#linkToWork>点击查看</a>
</p>

  public load() {
    this.workService.getById({id: this.params.workId})
      .subscribe((data) => {
        this.work = data;
        this.goToWork();
      }, () => {
        console.log('error');
      });
  }

goToWork(): void {
this.linkToWork.nativeElement.click();
}

<div class="mask" *ngIf="showPopWindow">
 <iframe  class="popWindow"  height="500px" width="100%" name="iframe_work"></iframe>
<p><a target="iframe_work" style="display: none"
[href]="protocol + '//' + (this.work.student.no + '.' + host + '/' + getWorkDir()) | safeUrl"
#linkToWork>点击查看</a>
</p>
</div>

<div class="mask" *ngIf="showPopWindow">
  <iframe class="popWindow" height="94%" width="100%"  src="https://www.baidu.com/"></iframe>
  <button type="button" class="btn btn-primary btn-lg btn-block" (click)="exitPopWindow()">退出预览</button>
</div>