2.写在head中的js
<![CDATA[
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>js基础-写在head中的js</title>
<style type="text/css">
</style>
<script type="text/javascript">
var x=5;
var y=6;
var m=x+y;
document.write(m);<!--结果输出在页面中document为文档节点-->
</script>
</head>
<body>
<span>2.写在head中的js</span>
</body>
</html>
]]>