微信小程序上传图片并预览

	<view>
     <view class='title'>
          上传图片
      </view>
      <view class='imgArr'>
          <view wx:for="{{imgArrs}}" class='img_item'>
              <image src='{{item}}' mode='widthFix' bindtap='previewImage' data-item="{{item}}"  />
          </view>
          <view class='addImg' bindtap='chooseImage'>
              <image  src='http://etc-app.oss-cn-beijing.aliyuncs.com/image_201905301537160389.png' mode='widthFix' />
          </view>
      </view>

</view>

.addImg {
  width: 122rpx;
	height: 122rpx; 
}
.imgArr image {
  display: inline !important;
  width: 100%;
  height: 100%;
}
.imgArr view {
  display: inline-block;
  margin: 10rpx;
}
.img_item {
    width: 122rpx;
	height: 122rpx; 
  border: 1rpx solid #e5e5e5;
  position: relative;
}
.title {
  height: 96rpx;
  line-height: 96rpx;
  font-size: 32rpx;
	font-weight: normal;
	font-stretch: normal;
	letter-spacing: 1rpx;
	color: #333333;
}

 data: {
    imgArrs:[],					//加一个图片显示一张
    idArrs:[]					//存放每张图片标识符id
  },

  /**
   * 组件的方法列表
   */
  methods: {
    chooseImage() {
      let that = this
      wx.chooseImage({
        count: 1,
        sourceType: ['album', 'camera'],
        success(res) {
          // tempFilePath可以作为img标签的src属性显示图片
          const path = res.tempFilePaths[0]
          wx.uploadFile({
            url: '要上传的地址',
            filePath: path,
            name: 'image',
            success: (res) => {
              console.log(res)
              // 根据查看结果是否需要json化
              let {url, id } = JSON.parse(res.data).data
              console.log(url)
              console.log(id)
              that.data.imgArrs.push(url)
              that.data.idArrs.push(id)
              that.setData({
                imgArrs: that.data.imgArrs,
                idArrs: that.data.idArrs
              })
              console.log(that.data.imgArrs)
              console.log(that.data.idArrs)

            }
          })
        }
      })
    },
    // 图片预览
    previewImage(e) {
      console.log(e)
      let that = this
      wx.previewImage({
        urls: that.data.imgArrs,
        current: e.target.dataset.item,
      })
    }
  }