把base64转回字符串出现和之前文件对不上的问题

      let reader = new FileReader()
      reader.readAsDataURL(file.raw)
      reader.onload = function () {
        _this.fileList = fileList
        _this.bartenderstring = reader.result.substring(reader.result.indexOf('base64') + 'base64,'.length)
      }

直接将文件使用readAsDataURL进行转base64

        let content = window.atob(this.bartenderstring)
        const blob = new Blob([content])
        let a = document.createElement('a');
        a.download = file.name + '.btw';
        a.href =  URL.createObjectURL(blob);
        let event = new MouseEvent('click');
        a.dispatchEvent(event);

获取的值进行window.atob解析

从sqlserver拿到的字符串然后进行base64解析的文件和之前上传的文件不同了

已解决

    decode (base64) {
      let decode = window.atob(base64)
      var len = decode.length
      var bytes = new Uint8Array(len)
      for (var i = 0; i < len; i++) {
        bytes[i] = decode.charCodeAt(i)
      }
      // let str = decodeURI(decode)
      return bytes
    }

现将base64转为字节bytes，在进行new Blob就能得到ANSI编码文件