How do I add debugging code to my JavaScript code?

To add debugging code in JavaScript, use the alert() or document.write() method in your program. For example,

var debugging = true;
var whichImage = "widget";

if( debugging )
alert( "Calls swapImage() with argument: " + whichImage );
var swapStatus = swapImage( whichImage );

if( debugging )
alert( "Exits swapImage() with swapStatus=" + swapStatus );

checking the content and order of alert(), you can check the health of your program very easily.

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