显示图像根据离子2的数组索引吗？

Question

我想根据数组索引显示图像，但是它显示的是内容不同的随机图像。

我的代码.ts文件

for (let i = 0; i < this._robots.length; i++) {
    this.posts1 = this._robots[i].AttachmentFiles;
    console.log("this.posts1",this.posts1+""); 
    for (let j = 0; j < this.posts1.length; j++) {
        this.array = this.posts1[j]["odata.id"];
        this.getImage(this.array).subscribe(res =>{
           let b: any = new Blob([res], { type: 'application/octet-stream' });
           var url = window.URL.createObjectURL(b);
           console.log("this is url bro"+url);
           console.log(this.photoPicArray);
           this.photoPicArray.push(url);
       });
       console.log("this is array url of 1234 images",this.photoPicArray+"");
    }
} 

在HTML文件中

<ion-slides #slider (ionDidChange)="SlideChanged()" [options]="_sliderOptions" id="ionSlider" class="main-slider">
    <ion-slide #slide *ngFor="let robot of _robots; let i = index ">
      <ion-grid class="content-info-item">
          <img [src]="sanitizer.bypassSecurityTrustResourceUrl(photoPicArray[i])" class="postimage" />
        <!-- <div class="postimage" attr.id="Testing{{i}}"></div> -->

        <div class="content-info-content">
          <p class="posttime">Time of post</p>
          <h1 class="GuardianEgyp-Regular-Web heading-title" (click)="goToLongStory(i)">{{robot.Title}}</h1>
          <p class="shortstory GuardianEgyp-Light-Web" (click)="goToLongStory(i)">{{robot.SortStory}}</p>
        </div>
      </ion-grid>