$(".item").attr("href","myCompeteInfo.html?comUserId="+cpId);
<a href="myCompeteInfo.html?comUserId=" class="item"><span class="compete-title"></span></a><em class="text"> • 课题设计</em>
<a href="myCompeteInfo.html?comUserId=" class="item font5 FR LH36">返回>></a>
利用attr,补全地址,代替window.open()有时会被浏览器阻拦的