document.body; 这个是什么意思
<body>
<script type="text/javascript">
var main = document.body;
//创建链接
function createa(url,text)
{
var x=document.createElement("a");
x.setAttribute("href",url);
x.innerHTML=text;
x.style.color="green";
main.appendChild(x);
}
// 调用函数创建链接
createa(" http://www.imooc.com","慕课网")
</script>
</body>
