关于a标签下载设置下载保存类型，部署到线上出错

写一个点击事件

a标签新的属性download

a标签中download属性部署到线上可能会出现属性失效，是因为出现跨域了。
解决方案：

<a @click="downloadFile(fileUrl,fileName)">下载文件</a>

downloadFile(url, fileName) {
    var x = new XMLHttpRequest();
    x.open("GET", url, true);
    x.responseType = 'blob';
    x.onload=function(e) {
        var url = window.URL.createObjectURL(x.response)
        var a = document.createElement('a');
        a.href = url
        a.download = fileName;
        a.click()
    }
    x.send();
},

参考：https://blog.csdn.net/weixin_44379204/article/details/105056713?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.channel_param