how to fix this symbol‘在angular 2应用程序中显示为&#39

<div [innerHTML]="'&#39;'"></div>

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

@Component({
  selector: 'app-example',
  template: '<div [innerHTML]="decodedSymbol"></div>'
})
export class ExampleComponent {
  decodedSymbol: any;

  constructor(private sanitizer: DomSanitizer) {
    this.decodedSymbol = this.sanitizer.bypassSecurityTrustHtml('&#39;');
  }
}