Alert Box
<html>
<head>
<script type="text/javascript">
function show_alert()
{
alert("I am an alert box");
}
</script>
</head>
<body>
<input type="button" onclick="show_alert()" value="show alert box"/>
</body>
</html>
Confirm Box
<html>
<head>
<script type="text/javascript">
function show_confirm()
{
var r=confirm("press a button");
if(r==true)
{
alert("you pressed ok!");
}
elese
{
alert("you pressed cancel!");
}
}
</script>
</head>
<body>
<input type="button" onclick="show_confirm()" value="show a confirm box"/>
</body>
</html>Prompt Box
<html>
<head>
<script type="text/javascript">
function show_prompt()
{
var name=prompt("Please Enter your Name ");
if(name!=null&name!="")
{
document.write("Hello "+name+" !How are you?");
}
}
</script>
</head>
<body>
<input type="button" onclick="show_prompt()" value="show prompt box"/>
</body>
</html>
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