Angular2 imitates WeChat to implement 9 image upload and preview example sharing

<p class="page uploader js_show">
  <p class="page__hd">
    <h1 class="page__title">Uploader</h1>
    <p class="page__desc">上传组件，一般配合<a class="link" href=" " rel="external nofollow" >组件Gallery</a >来使用。</p >
  </p>
  <p class="page__bd">
    <p class="weui-gallery" id="gallery" style="opacity: 0; display: none;">
      <span class="weui-gallery__img" id="galleryImg" style="background-image:url(./images/pic_160.png)"></span>
      <p class="weui-gallery__opr">
        <a href="javascript:" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="weui-gallery__del">
          <i class="weui-icon-delete weui-icon_gallery-delete"></i>
        </a >
      </p>
    </p>

    <p class="weui-cells weui-cells_form">
      <p class="weui-cell">
        <p class="weui-cell__bd">
          <p class="weui-uploader">
            <p class="weui-uploader__hd">
              <p class="weui-uploader__title">图片上传</p >
              <p class="weui-uploader__info">0/2</p>
            </p>
            <p class="weui-uploader__bd">
              <ul class="weui-uploader__files" id="uploaderFiles">
                <li class="weui-uploader__file" style="background-image:url(./images/pic_160.png)"></li>
                <li class="weui-uploader__file" style="background-image:url(./images/pic_160.png)"></li>
                <li class="weui-uploader__file" style="background-image:url(./images/pic_160.png)"></li>
                <li class="weui-uploader__file weui-uploader__file_status" style="background-image:url(./images/pic_160.png)">
                  <p class="weui-uploader__file-content">
                    <i class="weui-icon-warn"></i>
                  </p>
                </li>
                <li class="weui-uploader__file weui-uploader__file_status" style="background-image:url(./images/pic_160.png)">
                  <p class="weui-uploader__file-content">50%</p>
                </li>
              </ul>
              <p class="weui-uploader__input-box">
                <input id="uploaderInput" class="weui-uploader__input" type="file" accept="image/*" multiple="">
              </p>
            </p>
          </p>
        </p>
      </p>
    </p>
  </p>
  <p class="page__ft j_bottom">
    <a href="javascript:home()" rel="external nofollow" >< img src="./images/icon_footer_link.png"></a >
  </p>
</p>

<p class="weui-gallery" id="gallery">
 <!--显示预览-->
 <span class="weui-gallery__img" id="galleryImg"></span>
 <!--删除按钮-->
 <p class="weui-gallery__opr">
  <a href="javascript:" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="weui-gallery__del">
   <i class="weui-icon-delete weui-icon_gallery-delete"></i></a >
 </p>
</p>
图片缩略图列表部分：
 <ul class="weui-uploader__files" id="uploaderFiles">
  <!--每张图片是一个<li>标签-->
  <li class="weui-uploader__file" style="background-image:url(./images/pic_160.png)"></li>
</ul>

<li class="weui-uploader__file" style="background-image:url(./images/pic_160.png)"></li>

<ul class="weui-uploader__files picture-preview" id="uploaderFiles" >
                <li *ngFor="let img of picturesUrl"
                  class="weui-uploader__file"
                  [ngStyle]="{&#39;background-image&#39;:img}">
                </li>
</ul>

<!--img实例-->
<!--&#39;url(http://upload-images.jianshu.io/upload_images/7166236-ed8a621900728c39.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)&#39;-->

picturesUrl = [
  'url(http://upload-images.jianshu.io/upload_images/7166236-40ed406c30ef20a0.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)',
  'url(http://upload-images.jianshu.io/upload_images/7166236-d79762ed654342bf.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)',
  'url(http://upload-images.jianshu.io/upload_images/7166236-64e1a458e5e29d59.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)',
  'url(http://upload-images.jianshu.io/upload_images/7166236-9a267a540acb8688.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)',
  'url(http://upload-images.jianshu.io/upload_images/7166236-283f5687cb73eea8.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)',
 ]; //存储图片Url
 title = 'app';
 shown = false;  //是否显示预览，初始化为否
 selectImageUrl: string; //用于存放选中图片的url

<!--预览隐藏的样式-->
<p class="weui-gallery" id="gallery" style="opacity: 0; display: none;">
 
</p>

<!--预览显示的样式-->
<p class="weui-gallery" id="gallery" style="display: block; opacity: 1;">
 
</p>

<p class="weui-gallery" id="gallery" style="display: block"
       *ngIf="shown">
      <span class="weui-gallery__img" (click)="touchEvent()" [ngStyle]="{&#39;background-image&#39;:selectImageUrl}"></span>
      <p class="weui-gallery__opr">
        <a href="javascript:" rel="external nofollow" rel="external nofollow" rel="external nofollow" (click)="onDelete()" class="weui-gallery__del">
          <i class="weui-icon-delete weui-icon_gallery-delete"></i>
        </a >
      </p>
</p>

//点击缩略图显示预览
 showPicture($event){
  console.log("$event.target.backgroundImage：" + $event.target.style.backgroundImage);
  this.selectImageUrl = $event.target.style.backgroundImage;
  this.shown = true;
 }

//点击屏幕退出预览
touchEvent(){
  this.shown = false;
 }

onDelete(){
  if(isUndefined(this.selectImageUrl)){
   console.log("查看图片预览，图片url未定义，this.selectImageUrl：" + this.selectImageUrl);
   return;
  }
 //正则去除URL中的双引号
  this.selectImageUrl = this.selectImageUrl.replace(/"/g,"");
  console.log("(this.picturesUrl.indexOf(this.selectImageUrl):"+this.picturesUrl.indexOf(this.selectImageUrl));
  //判断图片URL是否存在
  if(this.picturesUrl.indexOf(this.selectImageUrl)!== -1){
   this.picturesUrl.splice(this.picturesUrl.indexOf(this.selectImageUrl) , 1);
   setTimeout(()=>{
     this.shown = false;
    },
    20);
  }else{
   console.log("删除图片出错，获取URL或URL格式出错出错：" + this.selectImageUrl )
  }
 }