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Asked: 2026-06-13T14:11:02+00:00

Recently I begin to study the jquery, I feel confused how jquery library implement

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Recently I begin to study the jquery, I feel confused how jquery library implement the $, I walked through the jquery source code and still cannot understand it.

Why is $( “#xid” ) equivalent to getElementById(“xid”)?

Could you please explain $ for me according to the source code of jquery?

thanks.

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1 Answer

  1. Editorial Team

    Quick Answer

    The $ is simply a function name. To explain in simple words, it just mimics the DOM Selector.

    function $(selector)
{
    if (selector[0] == "#")
        return document.getElementById(substr(selector, 1));
    else if (selector[0] == ".")
        return document.getElementsByClassName...
    else
        return document.getElementsByTagName...
}

    Where the selector is something like #hello, the selector[0] depicts the first character, which is a # in this case. The # is used to denote an ID of an element. Similarly, . is used to denote a class name and others are for tags. Hope it is clear.

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