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How can we check whether a function exists in javascript?

Platform: ASP.NET| Category: Client Side Scripting

We can check the existence of a function by Window.FunctionName as shown below, where the FunctionName is the name of the function,whose existence has to be checked.

<SCRIPT LANGUAGE='JavaScript' type='text/javascript'>
if( window.CheckIfExists)
 	alert( Function Not Exists!’ )

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