<script type="text/javascript">

var main = document.body;

//创建链接

function createa(url,text)

{

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

  a.href=url;

  a.innerHTML=text;

  a.style.color="red";

  main.appendChild(link);

}

// 调用函数创建链接

</script> 

<input type="button" name="Leo's" value="创建链接" onclick="createa("http://www.imooc.com","慕课网")"/>

</body>