var body = document.body;什么意思
<!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 body = document.body;
//创建链接
function createa(url,text)
{
var btn=document.createElement("a");
btn.href=url;
btn.innerHTML=text;
btn.style.color='red';
body.appendChild(btn)
}
// 调用函数创建链接
createa("http://www.imooc.com/","慕课网");
</script>
</body>
</html>
var body = document.body;
这个代码是干嘛的?前面什么都没说明,这一节课就多出这个代码
document.body什么意思?