SOURCE

 var links = document.getElementsByTagName('a');

    for(var i = 0; i < links.length; i++) {
        (function(j) {
            links[j].onclick = function() {
                var sort = this.dataset.sort,
                    uri = this.dataset.uri;

                if(sort === 'free') {
                    alert('这是免费影片');
                }else{
                    alert('这是付费影片');
                }
            }
        })(i)
    }

   <a href="javascript:;" data-uri="lldq" data-sort="free">流浪地球</a><br>
   <a href="javascript:;" data-uri="fczlm" data-sort="vip">复仇者联盟</a><br>
   <a href="javascript:;" data-uri="plmxs" data-sort="free">普罗米修斯</a><br>
   <a href="javascript:;" data-uri="xskjs" data-sort="vip">肖申克救赎</a><br>

a {
    text-decoration: none;
    font-size: 36px;
}