jQuery plugin example.

jqueryplugin.js

// Author: Tien Do

(function ($) {
    $.fn.redify = function(options) {
        // Extend our default options with those provided.
        // Note that the first argument to extend is an empty
        // object – this is to keep from overriding our "defaults" object.
        var settings = $.extend({}, $.fn.redify.defaults, options);
 
        return this.css({
            color: settings.color,
            backgroundColor: settings.backgroundColor
        });
    };

    // Plugin defaults – added as a property on our plugin function.
    $.fn.redify.defaults = {
        color: "#f00",
        backgroundColor: "white"
    };
}(jQuery));