function-throttler.js

/**
 * @usage $('body').on('mousemove', throttle(function (event) {console.log('tick');}, 1000));
 */
function throttle(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 + last - now);
        } else {
            last = now;
            fn.apply(context, args);
        }
    };
}