55 lines
1.2 KiB
JavaScript
55 lines
1.2 KiB
JavaScript
/**
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* @desc 函数防抖
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* @param func 目标函数
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* @param wait 延迟执行毫秒数
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* @param immediate true - 立即执行， false - 延迟执行
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*/
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export const debounce = function(func, wait = 1000, immediate = true) {
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let timer;
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return function() {
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let context = this,
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args = arguments;
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if (timer) clearTimeout(timer);
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if (immediate) {
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let callNow = !timer;
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timer = setTimeout(() => {
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timer = null;
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}, wait);
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if (callNow) func.apply(context, args);
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} else {
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timer = setTimeout(() => {
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func.apply(context, args);
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}, wait)
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}
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}
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}
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/**
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* @desc 函数节流
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* @param func 函数
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* @param wait 延迟执行毫秒数
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* @param type 1 使用表时间戳，在时间段开始的时候触发 2 使用表定时器，在时间段结束的时候触发
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*/
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export const throttle = (func, wait = 1000, type = 1) => {
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let previous = 0;
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let timeout;
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return function() {
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let context = this;
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let args = arguments;
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if (type === 1) {
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let now = Date.now();
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if (now - previous > wait) {
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func.apply(context, args);
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previous = now;
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}
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} else if (type === 2) {
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if (!timeout) {
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timeout = setTimeout(() => {
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timeout = null;
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func.apply(context, args)
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}, wait)
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}
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}
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}
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}
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