微信小程序---获取上传图片大小

wx.chooseImage({
        count: 1,
        sizeType: ['compressed'],
        sourceType: ['album', 'camera'],
        success: function (res) {
          var tempFilesSize = res.tempFiles[0].size;  //获取图片的大小，单位B
          const tempFilePaths = res.tempFilePaths;
          console.log('size:', tempFilesSize)
          if (tempFilesSize <= 2000000) {   //图片小于或者