<script type="text/javascript">

var main = document.body;

//创建链接

function createa(url,text)

{

    var link = document.createElement("a");

    link.setAttribute("href",url);

    link.innerHTML = text;

    link.style.color = "red";

    main.appendChild(link);

}

createa("http://www.imooc.com","慕课网");// 调用函数创建链接

</script>