Debugging in Jscript code can be done by adding the debugger: keyword to the code.

function DebugSample()

{

    alert(“Pop Up Message Before Debugging”);

    // debugger keyword will trigger the debug

    debugger;

    alert(“Pop Up Message After Debugging”);

}

Here is a detailed post on this: http://social.technet.microsoft.com/wiki/contents/articles/3256.how-to-debug-jscript-in-microsoft-dynamics-crm-2011.aspx

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