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35 lines
861 B
35 lines
861 B
5 years ago
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/**
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* 节流函数工具类
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*/
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define(function() {
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/**
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* 节流优化
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* @param {Function} fun 回调函数
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* @param {Number} delay 间隔时间
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*/
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function throttle(fun, delay) {
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var last = 0; // 最后调用的时间
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var timer; // 最新一次的定时器
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return function() {
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var main = this; // 获取方法对象
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var params = arguments; // 方法参数
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var now = +new Date(); // 最新调用的时间
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if(now - last < delay) {
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// 在规定的间隔内，调用存为定时器，并清除上一次定时器调用
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clearTimeout(timer);
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timer = setTimeout(function() {
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last = now; // 更新最后一次的调用时间
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fun.apply(main, params);
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}, delay)
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} else {
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// 超过规定的间隔内，立即调用
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last = now;
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fun.apply(main, params);
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}
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}
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}
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return {
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throttle: throttle
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}
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})
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