JavaScript Functions and Some Tricks
What exactly is a function? A function is a block of code given a name. Whenever you refer to a function by its name, the block of code gets executed. A function is usually defined (written) in between the <head> and </head> tags. The name is almost always followed by an opening and closing parantheis pair, like this: function_name ( ). The name of the function comes after the "function" keyword. The code that a function contains is encoded between { and }. A function is defined using the following syntax: function function_name () Now whenever we want to take actions listed in the body of some function, we can simply call the function by its name, like this: function_name ( ).
An Example <html> </head>
Summary Today we learned a very important concept in any programming / scripting language - the function. Functions are indispensible tools, without them you can't go any further. Make sure you do understand the concept behind them. Give me feedback / ask questions if things are not clear.
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{
body of the function
}
<head>
<title>Simple JavaScript Example</title>
<script language="JavaScript">
<!-- Hiding from old browsers
function do_work()
{
window.status='The best place on Cyberspace';
alert ('The best place on Cyberspace');
}
// done hiding !-->
<body>
<a href="http://www.somewhere.com/mypage"
onMouseOver= "do_work()"
onMouseOut= "window.status= ' ' ">
My Homepage
</a>
</body>
</html>
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