高阶函数 - 函数节流

        /*** 函数节流 - 限制函数被频繁调用* @param  {Function} fn       [需要执行的函数]* @param  {[type]}   interval [限制多长的时间再重复执行fn]*/var throttle = function(fn, interval) {var __self = fn,timer,firstTime = true;return function() {var args = arguments,__me = this;if (firstTime) {__self.apply(__me, args);return firstTime = false;};if (timer) {return false;};timer = setTimeout(function() {clearTimeout(timer);timer = null;__self.apply(__me, args);}, interval || 500);};};// testfunction A() {console.log('A');};var A2 = throttle(A, 1000);setInterval(A2, 100);