//获取数组最后一个元素 
  let hasFiles = files[Object.keys(files).pop()] // 参考上面的图片 
  let file = hasFiles.url 
  let name = hasFiles.file.name 
  let type = hasFiles.file.type 
 
  function base64ToBlob(urlData, type) { 
    let arr = urlData.split(','); 
    let mime = arr[0].match(/:(.*?);/)[1] || type; 
    // 去掉url的头，并转化为byte 
    let bytes = window.atob(arr[1]); 
    // 处理异常,将ascii码小于0的转换为大于0 
    let ab = new ArrayBuffer(bytes.length); 
    // 生成视图（直接针对内存）：8位无符号整数，长度1个字节 
    let ia = new Uint8Array(ab); 
    for (let i = 0; i < bytes.length; i++) { 
      ia[i] = bytes.charCodeAt(i); 
    } 
    return new Blob([ab], { 
      type: mime 
    }); 
  } 
 
  if (hasFiles.file.size > 1024 * 1024 * 10) { 
    throw '文件超过10M' 
  } 
  let conversions = base64ToBlob(file, type) 
  let param = new FormData() 
  // 没给好一个值 param.append('file', file, name) 改为param.append('file', conversions, name) 
  param.append('file', conversions, name) 
  param.append('chunk', '0') 
  axios.post(config.api.upload, param).then(function (res) { 
    if (res.status === 200) { 
      //后端判断文件大小 
      if (res.data && res.data.state === 'ERROR') { 
        throw res.data && res.data.msg; 
      } 
      console.log(res) 
    } 
  });