console 命令行工具 X clear

console

function disp_prompt(){
    var name=prompt("请输入您的姓名","123");
    if (name!=null && name!="")
    {
        document.write("您好，" + name + "!");
    }
}

<html>
    <head>
        <title>提示框</title>
    </head>
    <body>
	<form action="" method="post">
        <input type="button" onclick="disp_prompt()" value="显示确认框">
    </form>
</body>
</html>