<image src="{{value}}" class="picture_img" bindtap="pictureChange"/> pictureChange(){ wx.chooseMedia({         count: 1,         mediaType: ['image' ],         sourceType: ['album', 'camera'],         camera: 'front',         success(res) {           console.log(res.tempFiles[0].tempFilePath)           console.log(res.tempFiles[0].size)         }       })     },