警示框确认框提示框

定义三个输入控件，点击进入对应的函数

<html>
<head>
<script>
function show_alert()
{
    alert("I am alert");
}
function show_confirm()
{
    var r = confirm("Press a button!")
    if (r == true)
    {
       alert("You pressed OK!");
    }
    else
    {
       alert("Your pressed Cancel!");
    }
}
function show_prompt()
{
   var name = prompt("Please input your name", "Bill Gates")
    if (name != null && name != "")
    {
         document.write("Hello!" + name + " How are you?")
    }
}
</script>
</head>

<body>
<input type="button" onclick="show_alert()" value="show a alert"/>
<input type="button" onclick="show_confirm()" value="show a confirm"/>
<input type="button" onclick="show_prompt()" value="show a prompt"/>
</body>
</html>

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警示框确认框提示框