1. 加入JS
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>TestJS</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<script type = "text/javascript">
function init() {
alert("Hello World!!!");
}
</script>
<body onload=init()>
</body>
</html>
2.