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base64转file/blob对象：

dataURLtoFile(dataurl, filename) {
      var arr = dataurl.split(",");
      var mime = arr[0].match(/:(.*?);/)[1];
      var bstr = atob(arr[1]);
      var n = bstr.length;
      var u8arr = new Uint8Array(n);
      while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
      }
      //转换成file对象
      return new File([u8arr], filename, { type: mime });
      //转换成成blob对象
      //return new Blob([u8arr],{type:mime});
    },

base 64转file对象：

 // 将base64转换为blob
    dataURLtoBlob(dataurl) {
      var arr = dataurl.split(",");
      var mime = arr[0].match(/:(.*?);/)[1];
      var bstr = atob(arr[1]);
      var n = bstr.length;
      var u8arr = new Uint8Array(n);
      while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
      }
      return new Blob([u8arr], { type: mime });
    },

blob对象转file对象

// 将blob转换为file
    blobToFile(theBlob, fileName) {
      theBlob.lastModifiedDate = new Date();
      theBlob.name = fileName;
      return theBlob;
    }