1)Alert box
<html>
<head>
<script type="text/javascript">
function disp_alert()
{
alert("I am an alert box!!")
}
</script>
</head>
<body>
<input type="button" onclick="disp_alert()" value="Display alert box" />
</body>
</html>
(2) confirm box
<html>
<head>
<script type="text/javascript">
function disp_confirm()
? {
? var r=confirm("Press a button")
? if (r==true)
??? {
??? document.write("You pressed OK!")
??? }
? else
??? {
??? document.write("You pressed Cancel!")
??? }
? }
</script>
</head>
<body>
<input type="button" onclick="disp_confirm()" value="Display a confirm box" />
</body>
</html>
(3)
Prompt box
<html>
<head>
<script type="text/javascript">
function disp_prompt()
? {
? var name=prompt("Please enter your name","Harry Potter")
? if (name!=null && name!="")
??? {
??? document.write("Hello " + name + "! How are you today?")
??? }
? }
</script>
</head>
<body>
<input type="button" onclick="disp_prompt()" value="Display a prompt box" />
</body>
</html>
(4)
?Call a function1
<html>
<head>
<script type="text/javascript">
function myfunction()
{
alert("HELLO")
}
</script>
</head>
<body>
<form>
<input type="button"
onclick="myfunction()"
value="Call function">
</form>
<p>By pressing the button, a function will be called. The function will alert a message.</p>
</body>
</html>
(5)
Function with an argument
<html>
<head>
<script type="text/javascript">
function myfunction(txt)
{
alert(txt)
}
</script>
</head>
<body>
<form>
<input type="button"
onclick="myfunction('Hello')"
value="Call function">
</form>
<p>By pressing the button, a function with an argument will be called. The function will alert
this argument.</p>
</body>
</html>
(7)Function with an argument 2
<html>
<head>
<script type="text/javascript">
function myfunction(txt)
{
alert(txt)
}
</script>
</head>
<body>
<form>
<input type="button"
onclick="myfunction('Good Morning!')"
value="In the Morning">
<input type="button"
onclick="myfunction('Good Evening!')"
value="In the Evening">
</form>
<p>
When you click on one of the buttons, a function will be called. The function will alert
the argument that is passed to it.
</p>
</body>
</html>
(8)
Function_return
<html>
<head>
<script type="text/javascript">
function myFunction()
{
return ("Hello, have a nice day!")
}
</script>
</head>
<body>
<script type="text/javascript">
document.write(myFunction())
</script>
<p>The script in the body section calls a function.</p>
<p>The function returns a text.</p>
</body>
</html>
(9)
<html>
<head>
<script type="text/javascript">
function product(a,b)
{
return a*b
}
</script>
</head>
<body>
<script type="text/javascript">
document.write(product(4,3))
</script>
<p>The script in the body section calls a function with two parameters (4 and 3).</p>
<p>The function will return the product of these two parameters.</p>
</body>
</html>
(10)
loop
<html>
<body>
<script type="text/javascript">
for (i = 0; i <= 5; i++)
{
document.write("The number is " + i)
document.write("<br />")
}
</script>
<p>Explanation:</p>
<p>This for loop starts with i=0.</p>
<p>As long as <b>i</b> is less than, or equal to 5, the loop will continue to run.</p>
<p><b>i</b> will increase by 1 each time the loop runs.</p>
</body>
</html>
(11)
<html>
<body>
<script type="text/javascript">
for (i = 1; i <= 6; i++)
{
document.write("<h" + i + ">This is header " + i)
document.write("</h" + i + ">")
}
</script>
</body>
</html>
(12)
<html>
<body>
<script type="text/javascript">
i = 0
while (i <= 5)
{
document.write("The number is " + i)
document.write("<br />")
i++
}
</script>
<p>Explanation:</p>
<p><b>i</b> is equal to 0.</p>
<p>While <b>i</b> is less than , or equal to, 5, the loop will continue to run.</p>
<p><b>i</b> will increase by 1 each time the loop runs.</p>
</body>
</html>
(13)
<html>
<body>
<script type="text/javascript">
i = 0
do
{
document.write("The number is " + i)
document.write("<br />")
i++
}
while (i <= 5)
</script>
<p>Explanation:</p>
<p><b>i</b>? equal to 0.</p>
<p>The loop will run</p>
<p><b>i</b> will increase by 1 each time the loop runs.</p>
<p>While <b>i</b> is less than , or equal to, 5, the loop will continue to run.</p>
</body>
</html>
(14)
<html>
<body>
<script type="text/javascript">
var i=0
for (i=0;i<=10;i++)
{
if (i==3){break}
document.write("The number is " + i)
document.write("<br />")
}
</script>
<p>Explanation: The loop will break when i=3.</p>
</body>
</html>
(15)
<html>
<head>
<script type="text/javascript">
var txt=""
function message()
{
try
?? {
?? adddlert("Welcome guest!")
?? }
catch(err)
?? {
?? txt="There was an error on this page.\n\n"
?? txt+="Error description: " + err.description + "\n\n"
?? txt+="Click OK to continue.\n\n"
?? alert(txt)
?? }
}
</script>
</head>
<body>
<input type="button" value="View message" onclick="message()" />
</body>
</html>