throttle.js

      var throttle =  function(func, wait) {
                var context, args, timeout, result, previous, later;
                previous = 0;
                later = function() {
                    previous = new Date();
                    timeout = null;
                    result = func.apply(context, args);
                };
                return function() {
                    var now = new Date(), remaining = wait - (now - previous);
                    context = this;
                    args = arguments;
                    if (remaining <= 0) {
                        clearTimeout(timeout);
                        timeout = null;
                        previous = now;
                        result = func.apply(context, args);
                    } else if (!timeout) {
                        timeout = setTimeout(later, remaining);
                    }
                    return result;
                };
            }

  function throttle(){}

first	second
1	2
3	4

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