微信小程序wx.chooseImage和wx.previewImage的综合使用（图片上传不限制最多张数）

WXML:

<view class="weui">
  <view class="weui-uploader">
      <view class="weui-uploader__files">
        <block wx:for="{{imageList}}" wx:for-item="image" wx:for-index='idx'>
          <view class="weui-uploader__file">
            <image class="weui-uploader__img" src="{{image}}" data-id="{{idx}}" data-src="{{image}}" bindtap="previewImage"></image>
          </view>
        </block>
      </view>
      <view class="weui-uploader__input-box">
        <view class="weui-uploader__input" bindtap="chooseImage"></view>
      </view>
  </view>
  </view>

WXSS:

page {
  font-family: -apple-system-font, "Helvetica Neue", sans-serif;
}
icon {
  vertical-align: middle;
}
.weui{
  width: 100%;
  height: auto;
  display: flex;
  flex-direction: column;
  background-color: #fff;
}
.weui-uploader{
  width: 94%;
  margin-left: 3%;
  padding: 0px 0px 9px;
}
.weui-uploader__file {
  float: left;
  margin-right: 9px;
   margin-top: 9px;
}
.weui-uploader__img {
  display: block;
  width: 79px;
  height: 79px;
}
.weui-uploader__file_status {
  position: relative;
}
.weui-uploader__input-box {
  float: left;
  position: relative;
  margin-right: 9px;
  margin-top: 9px;
  width: 77px;
  height: 77px;
  border: 1px solid #d9d9d9;
}
.weui-uploader__input-box:before, .weui-uploader__input-box:after {
  content: " ";
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  background-color: #d9d9d9;
}
.weui-uploader__input-box:before {
  width: 2px;
  height: 39.5px;
}
.weui-uploader__input-box:after {
  width: 39.5px;
  height: 2px;
}
.weui-uploader__input-box:active {
  border-color: #999;
}
.weui-uploader__input-box:active:before, .weui-uploader__input-box:active:after {
  background-color: #999;
}
.weui-uploader__input {
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
}

JS:

Page({
  data: {
    imageList: [],
  },
  chooseImage: function (event) {
    var that = this;
    wx.chooseImage({
      count: 5, // 一次最多可以选择2张图片一起上传
      sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
      sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
      success: function (res) {
        var imgeList=that.data.imageList.concat(res.tempFilePaths);
        that.setData({
          imageList: imgeList
        });
      }
    })
  },
  previewImage: function (e) {
    var that = this;
    var dataid = e.currentTarget.dataset.id;
    var imageList = that.data.imageList;
    wx.previewImage({
      current: imageList[dataid],
      urls: this.data.imageList
    });
  }
})