<!DOCTYPE HTML>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<SCRIPT LANGUAGE="JavaScript">
<!--
//1.输出对话框
alert("alert输入对话框。");
//2.判断对话框,只有true和false之分
var choose = confirm("确定吗?");
alert(choose);
//3.提示并可传值对话框,有值的话返回该值,无值的话返回null
var value = prompt("What's your name?","Michael");
alert(value);
//-->
</SCRIPT>
</HEAD>
<BODY>
</BODY>
</HTML>