JS案例：打开页面，首先弹出一个问候对话框
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>alert对话框使用示例</title>
</head>
<body>
<script type="text/javascript">
var name="张三";
alert("欢迎"+name+"来到潍坊！");
</script>
</body>
</html>
