vue下載excel權限限制處理

 在開發過程中會遇到下載excel但是需要傳token來驗證的問題，一般情況下是用直接指向地址來實現，但是token校驗沒辦法實現，所以就用到了blod

 一般情況下:

var pathurl = process.env.VUE_APP_CUSTOMERRL_URL + 'xxx/xxxx';
window.open(pathurl, '_blank')

采用blod：

var xhr = new XMLHttpRequest();
var formData = new FormData();
xhr.open('get',process.env.VUE_APP_CUSTOMERRL_URL + 'xxx/xxxx'); 
xhr.setRequestHeader("Authorization",'bearer '+localStorage.getItem("access_token")); 
xhr.responseType = 'blob';        
xhr.onload = function (e) {
    let blob = new Blob([xhr.response], {type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8'});
    let downloadElement = document.createElement('a');
    let href = window.URL.createObjectURL(blob); //創建下載的鏈接
    downloadElement.href = href;
    downloadElement.download = 'demo.xlsx'; //下載后文件名
    document.body.appendChild(downloadElement);
    downloadElement.click(); //點擊下載
    document.body.removeChild(downloadElement); //下載完成移除元素
    window.URL.revokeObjectURL(href); //釋放掉blob對象
 };
 xhr.send(formData);