ERROR Error: unsafe value used in a resource URL context

在组件里面引入angular内置的DomSanitizer模块
import { DomSanitizer } from '@angular/platform-browser';
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####在构造器里面定义属性

 constructor(private sanitizer: DomSanitizer) {}  
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####将地址转化为安全地址

 this.safeUrl = this.sanitizer.bypassSecurityTrustResourceUrl(url); 
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####在HTML中的写法

 <iframe id="treeid" [src]="treeUrl" width="100%" ></iframe>

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