后台页面数据导出

 //导出
    exportExl() {
 
    	let url = process.env.VUE_APP_BASE_API + `/Approval/exportCheckApproval?pages=${this.pages}`;
        url = url + `&villageName=${this.cz}`;  // 导出的查询的条件
      if (this.villageAreaId != "") {
        url = url + `&addressId=${this.villageAreaId}`;
      }
      // window.location.href = url;
                          var xhr = new XMLHttpRequest();
      xhr.open("get", url, true); // get、post都可
      xhr.responseType = "blob";  // 转换流
      xhr.setRequestHeader("Authorization", "Bearer"+" "+ getToken()); // token键值对
      xhr.onload = function() {
          if (this.status == 200) {
              var blob = this.response;
              var a = document.createElement("a")
              var url = window.URL.createObjectURL(blob)
              a.href = url
              a.download = "xxx.xls"  // 文件名
          }
       a.click()
       window.URL.revokeObjectURL(url)
       } 
       xhr.send();
    },