wx.chooseImage({

     success (res) {

        const tempFilePaths = res.tempFilePaths

        wx.uploadFile({

          url: 'https://******/uploadPic.ashx', //仅为示例，非真实的接口地址

          filePath: tempFilePaths[0],

          name: 'uploadfile',

          formData: {

            'user': 'test'

          },

          success (res){

            const data = res.data

            console.log(data)

            //do something

          }

        })

      }

    })

后端ashx

HttpPostedFile file = context.Request.Files[“uploadfile”];//接收

打印一直是null，无法接收到前端上传的文件路径？？？？？？？？？？？？？？？？？