// 防抖
function debounce(fn, wait = 50, immediate) {
let timer;
return function() {
if (immediate) {
fn.apply(this, arguments)
}
if (timer) clearTimeout(timer)
timer = setTimeout(() => {
fn.apply(this, arguments)
}, wait)
}
}
// 节流
function throttle(fn, wait) {
let prev = new Date();
return function() {
const args = arguments;
const now = new Date();
if (now - prev > wait) {
fn.apply(this, args);
prev = new Date()
}
}
}