防抖函数
回调函数会在停止触发的规定时间后执行
function debounce(fn,delay){
let timer = null
return function() {
if(timer){
clearTimeout(timer)
}
timer = setTimeout(fn,delay)
}
}
节流函数
回调函数会每隔规定时间执行一次
function throttle(fn, delay) {
let date = new Date();
return function() {
const currentDate = new Date();
if (currentDate - date > delay) {
fn();
date = currentDate;
}
}
}