微信小程序多张照片上传与展示实现详解

<view class="page">
    <view class="page__bd">
        <mp-cells>
            <mp-cell>
                <mp-uploader select="{{selectFile}}" upload="{{uplaodFile}}" files="{{files}}" max-count="4" title="附件上传" tips="最多可上传4张照片"></mp-uploader>
            </mp-cell>
        </mp-cells>
    </view>
</view>

//data中
 this.setData({ 
            selectFile: this.selectFile.bind(this),
            uplaodFile: this.uplaodFile.bind(this)
        })

 uplaodFile(files) {
        console.log('upload files', files)
        console.log('upload files', files)
        // 文件上传的函数，返回一个promise
        return new Promise((resolve, reject) => {
          const tempFilePaths = files.tempFilePaths;
          //上传返回值
          const that = this;
          const object = {};
          for (var i = 0; i < tempFilePaths.length; i++) {
            let filePath = tempFilePaths[i]
            wx.uploadFile({
                filePath: filePath,
                name: 'file',
                url: 'http://localhost:3000/upload/upload',
                success: function(res){
                    console.log('444',res.statusCode)
                    if (res.statusCode=== 200 ) {
                        const url = JSON.parse(res.data).url
                        that.data.files.push(url)
                        if (that.data.files.length === tempFilePaths.length) {
                          object.urls = that.data.files;
                          resolve(object)  //这就是判断是不是最后一张已经上传了，用来返回，
                        }
                      } else {
                        reject('error')
                      }
                }
              })
          }
        })
        // 文件上传的函数，返回一个promise
    },

<view>
<block wx:for="{{images}}" wx:for-item="src">
  <image  src="{{src}}"></image>           
</block>
<view bindtap="upload">上传</view>

upload(){
    let that = this;
    wx.chooseImage({//异步方法
        count: 9,//最多选择图片数量
        sizeType: ['original', 'compressed'],//选择的图片尺寸 原图，压缩图
        sourceType: ['album', 'camera'],//相册选图，相机拍照
        success(res) {
            //tempFilePaths可以作为图片标签src属性
            const tempFilePaths = res.tempFilePaths
            console.log("选择成功", res)
            for (let i = 0; i < tempFilePaths.length; i++) {//多个图片的循环上传
                wx.cloud.uploadFile({//上传至微信云存储
                    cloudPath: 'myImage/' + new Date().getTime() + "_" + Math.floor(Math.random() * 1000) + ".jpg",//使用时间戳加随机数作为上传至云端的图片名称
                    filePath: tempFilePaths[i],// 本地文件路径
                    success: res => {
                        // 返回文件 ID
                        console.log("上传成功", res.fileID)
                        that.setData({
                            images: res.fileID//获取上传云端的图片在页面上显示
                        })
                        wx.showToast({
                            title: '上传成功',
                        })
                    }
                })
            }
        }
    })
}

 getShare().then(res=>{
        const list=res.data
         list.forEach(obj => {
            console.log('8888',obj.img)
         const imgString = obj.img;
         const trimmedString = imgString.replace('["', '').replace('\"]', '');
         const imgArray = trimmedString.split('"\,\"');
         console.log('444',imgArray)
         obj.img = imgArray;
        })
        this.setData({
            shareList:list
        })
       })