loads(){
		  let data={
			  userWord:this.dataList.userWord,
			  examId:this.$route.query.id,
			  exportType:this.active,
		  }
		api.exportUserResult(data).then((res) => {
					const blob = new Blob([res.data]); 
                    const fileName = '考試成績.xls';
                    const linkNode = document.createElement('a');
                    linkNode.download = fileName; //a標簽的download屬性規(guī)定下載文件的名稱
                    linkNode.style.display = 'none';
                    linkNode.href = URL.createObjectURL(blob); //生成一個Blob URL
                    document.body.appendChild(linkNode);
                    linkNode.click();  //模擬在按鈕上的一次鼠標單擊
                    URL.revokeObjectURL(linkNode.href); // 釋放URL 對象
                    document.body.removeChild(linkNode);
      });
	  },

     axios({
        method: "post",
        url: url,
        data: params,
        headers: {
          // ... 接口需要的請求頭
        },
        responseType: "blob"
      }).then(response => {
        const blob =  new Blob([res.data],{type: 'application/vnd.ms-excel'});
        const fileName = res.headers["content-disposition"].split("=")[1]; //接口響應頭定義的文件名
        downloadFile(blob, fileName);
      });

//import { Message } from "element-ui";
 
/**
 * 文件下載, 對于下載鏈接可直接用 window.open(url, "_blank");
 * @param {*} data 二進制數據或base64編碼 Blob、String
 * @param {*} fileName 下載的文件命名，可帶擴展名，跨域下無效
 */
export function downloadFile(data, fileName) {
  let url = "";
  let isBlob = false;
  const errMsg = "下載出錯，文件數據無法識別！";
 
  if (data instanceof Blob) {
    isBlob = true;
    url = window.URL.createObjectURL(data);
  } else if (typeof data == "string") {
    // base64編碼
    url = data;
  } else {
    Message.error(errMsg);
    return;
  }
 
  if ("download" in document.createElement("a")) {
    // 非IE下載
    const tmpLink = document.createElement("a");
    tmpLink.download = fileName || "";
    tmpLink.style.display = "none";
    tmpLink.href = url;
    document.body.appendChild(tmpLink);
    tmpLink.click();
    window.URL.revokeObjectURL(tmpLink.href); // 釋放URL 對象
    document.body.removeChild(tmpLink);
  } else {
    // IE10+下載
    if (isBlob) {
      window.navigator.msSaveBlob(data, fileName);
    } else {
      //Message.error(errMsg);
      console.log(errMsg);
      return;
    }
  }
}