4

This question already has an answer here:

I see that label in most SharePoint JavaScript libraries. I am curious - what's that used for?

Example:

EnsureScriptFunc("clienttemplates.js", "RenderUserFieldWorker", function () {
    ULS2Vv:; // <-- THIS IS THE LABEL IN QUESTION
    var renderCtx = new ContextInfo();
    renderCtx.Templates = {};
...
}

marked as duplicate by SPArchaeologist, Gaurravs, Trevor Seward, Mohamed El-Qassas MVP Feb 8 '18 at 17:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

4

It is used to leverage the ULS (Unified Logging Service) capabilities. If you go look in the hive and open any of the *.js files, you'll find a similar declaration at the beginning of the file. Each file uses a slightly different declaration, but they all begin with ULS.

For example, in SP 2010 SP.debug.js this is ULS5vl and is declared:

function ULS5Vl() {
    var o=new Object;
    o.ULSTeamName="Microsoft SharePoint Foundation";
    o.ULSFileName="SP.debug.js";
    return o;
}

The label ULS5vl:; throughout the file at the beginning of each function is used to provide trace information.

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