利用js自动触发一个a标签的下载事件

 html

<a id="a-upload"></a>

 js

 var link = document.getElementById('a-upload');
 $(link).attr("href", "http://p370kpyfw.bkt.clouddn.com/app-release_100_jiagu_sign.apk");
 $(link).attr("download", "http://p370kpyfw.bkt.clouddn.com/app-release_100_jiagu_sign.apk");
 link.click();