prompt 提示框
<html>
<head>
<script type="text/javascript">
function disp_prompt()
{
var name=prompt("请输入您的名字","Bill Gates")
if (name!=null && name!="")
{
document.write("你好！" + name + " 今天过得怎么样？")
}
}
</script>
</head>
<body>
<input type="button" onclick="disp_prompt()" value="显示提示框" />
</body>
</html>
confirm 确认框
<html>
<head>
<script type="text/javascript">
function show_confirm()
{
var r=confirm("Press a button!");
if (r==true)
{
alert("You pressed OK!");
}
else
{
alert("You pressed Cancel!");
}
}
</script>
</head>
<body>
<input type="button" onclick="show_confirm()" value="Show a confirm box" />
</body>
</html>
alert("我是警告框！！")
<html>
<head>
<script type="text/javascript">
function disp_alert()
{
alert 我是警告框！！
}
</script>
</head>
<body>
<input type="button" onclick="disp_alert()" value="显示警告框" />
</body>
</html>
原文：http://www.cnblogs.com/xuehen/p/4834303.html