ERROR Error: unsafe value used in a resource URL context

在組件里面引入angular內置的DomSanitizer模塊
import { DomSanitizer } from '@angular/platform-browser';
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####在構造器里面定義屬性

 constructor(private sanitizer: DomSanitizer) {}  
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####將地址轉化為安全地址

 this.safeUrl = this.sanitizer.bypassSecurityTrustResourceUrl(url); 
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####在HTML中的寫法

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