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Page Navigation: Basic Function Structure · Calling a Function · Return | Fixing Errors This page was last updated on 2012-08-21 Now that we know about event handlers, variables, and statements, it is time to bring all our knowledge together — to create functions. This function can now be called from anywhere on the page, and whenever it is, the code between the curly braces is executed, with the arguments you passed in being substituted in.

Unlike normal lines of code, functions only kick into operation when you call for them.

They pop up everywhere, even for the most experienced programmers, but thankfully usually aren't too taxing to find.

There are a number of ways to find the problem, and a number of common errors that I'll mention here.

Click the following links to add the numbers and be alerted to the answer.

Add 3 4 | Add 19 2 | Add 8 40 Now you can see how much flexibility this one function can give you.

You can use is Internet Explorer's object that holds all the page elements in it (it is Microsoft's proprietary DOM structure).

So, if we write a script that uses the IE DOM, we'll want to make sure that no browsers of other types try executing the code, as they'd hit on a pile of errors.

We can also use this one function to add values on an event.To accomplish this, we test if Better and more specific support detection will be addressed later.Even from coding through the examples in the last few tutorials you've probably hit upon a number of Java Script errors.Once you have found the error, check for misplaced line breaks, misspellings of Java Script keywords, correct capitalisation of variable and function names, use of undefined variables and proper quoting (especially those apostrophes in Strings). Oftentimes they're all caused by one or two errors high up in your document.You should start from the top, and when you find any errors, run the script again. If you can't get a script to work, don't include it into your page until you can.

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