throttle.js

/**
 * JS Throttle Function
 * @example
    $('body').on('mousemove', throttle(function (event) {
        console.log('tick');
    }, 1000));
 *
 * @param fn {Function} callback function
 * @param threshhold {Number} Threshold in milliseconds
 * @param scope {object} Scope to pass into function.
 * @returns {Function}
 */
throttle: function(fn, threshhold, scope) {
    threshhold || (threshhold = 250);
    var last,
        deferTimer;
    return function () {
        var context = scope || this;

        var now = +new Date,
            args = arguments;
        if (last && now < last + threshhold) {
            // hold on to it
            clearTimeout(deferTimer);
            deferTimer = setTimeout(function () {
                last = now;
                fn.apply(context, args);
            }, threshhold);
        } else {
            last = now;
            fn.apply(context, args);
        }
    };
}