为什么出不来东西
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<script type="text/javascript">
var main = document.body;
//创建链接
function createa(url,text)
{
// 链接地址 http://www.imooc.com，文本为:慕课网
alert("000");
var a=createElement("a");
a.addAttribute("href",url);
a.innerHTML=text;
document.innerHTML=a;
};
// 调用函数创建链接
createa("http://www.imooc.com","慕课网");
</script>
</body>
</html>
