原生微信小程序批量上传文件

<!--index.wxml-->
<view class="container">
  <block wx:for="{{images}}" wx:key="*this">
    <view>
      <image src="{{item}}" bindtap="handleImagePreview"></image>
    </view>
  </block>
    <button bindtap="uploudImage"> 批量上传 </button>
</view>

//index.js
//获取应用实例
const app = getApp()

Page({
  data: {
    images:[],
  },
  onLoad: function () {
  },
  uploudImage() {
    const that = this;
    wx.chooseImage({
      count: 9,
      sizeType: ['original', 'compressed'],
      sourceType: ['album', 'camera'],
      success(res) {
        // tempFilePath可以作为img标签的src属性显示图片
        const tempFilePaths = res.tempFilePaths
        console.log(res);
        that.setData({
          images: tempFilePaths,
        });
        var promise = Promise.all(tempFilePaths.map((tempFilePath, index) => {
          return new Promise(function (resolve, reject) {
            wx.uploadFile({
              url: 'uploadurl',
              filePath: tempFilePath,
              name: 'name',
              header: {},
              formData: {},
              success: function (res) {
                resolve(res.data);
              },
              fail: function (err) {
                console.log(err)
                reject(new Error('failed to upload file'));
              }
            });
          });
        }));
        promise.then(function (results) {
          console.log(results); //返回上传成功的数据
        }).catch(function (err) {
          console.log(err);
        });
      }
    })
  },
})