function throttle(fn, gapTime) { if (gapTime == null || gapTime == undefined) { gapTime = 1500 } let _lastTime = null // 返回新的函數 return function () { let _nowTime = + new Date() if (_nowTime - _lastTime > gapTime || !_lastTime) { fn.apply(this, arguments) //將this和參數傳給原函數 _lastTime = _nowTime } } } module.exports = { throttle: throttle }
but_: util.throttle(function(e) { let that = this var data; //執行函數內容 }, 1000),