js 文件下载兼容ie 火狐

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获取流

downloadFile() {
   Api[this.templateHref](this.particpant).then(res => {
      let blob = new Blob([res], {type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;'}) // ttype 限定为excel
        utils.downFile(blob, this.fileName)
    })
  },

//导出文件
    downFile:function(blob, fileName) {
        if (window.navigator.msSaveOrOpenBlob) {
            navigator.msSaveBlob(blob, fileName);
        } else {
          const elink = document.createElement('a')
          elink.download = fileName
          elink.style.display = 'none'
          elink.href = URL.createObjectURL(blob)
          document.body.appendChild(elink)
          elink.click()
          URL.revokeObjectURL(elink.href) // 释放URL 对象
          document.body.removeChild(elink)
          // var link = document.createElement('a');
          // link.href = window.URL.createObjectURL(blob);
          // link.download = fileName;
          // link.click();
          // window.URL.revokeObjectURL(link.href);
        }
    },