1. 函数防抖(事件频繁触发,在特定时间内,函数只被触发一次, 如果在特定时间内,不断被触发,则会重新计算时间)
<button id="btn1">防抖</button> // 防抖 function getData() { console.log(1111); } const debounce = (fn, delay = 300) => { let timer = null; return (...args) => { if (timer) { clearTimeout(timer) } timer = setTimeout(() => { fn.apply(this, args) }, delay) } } let btn1 = document.getElementById('btn1') btn1.addEventListener('click', debounce(getData, 500))
2. 函数节流 (事件频繁被触发, 在特定时间内,只触发一次, 若在单位时间内, 触发多次, 只要一次生效)
<input id="search" type="text" name="search"> // 节流 function queryData(text) { console.log('搜索' + text); } const throttle = (fn, delay = 300) => { let flag = false; return (...arg) => { if (flag) return; flag = true; setTimeout(() => { fn.apply(this, arg); flag = false; }, delay); } } const search = document.getElementById('search'); const throttleFn = throttle(queryData, 500); search.addEventListener('keyup', (event) => { throttleFn(event.target.value) })
若有不对的地方, 请指出...