vue下载excel权限限制处理

 在开发过程中会遇到下载excel但是需要传token来验证的问题，一般情况下是用直接指向地址来实现，但是token校验没办法实现，所以就用到了blod

 一般情况下:

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); //创建下载的链接
    downloadElement.href = href;
    downloadElement.download = 'demo.xlsx'; //下载后文件名
    document.body.appendChild(downloadElement);
    downloadElement.click(); //点击下载
    document.body.removeChild(downloadElement); //下载完成移除元素
    window.URL.revokeObjectURL(href); //释放掉blob对象
 };
 xhr.send(formData);