节流与防抖
2023-02-26 21:02:00
节流
节流函数：在指定时间内只执行一次
throttle.ts
function throttle<T extends (...args: any[]) => any>(fn: T, delay: number): (...args: Parameters<T>) => ReturnType<T> | void {
let lastTime = 0;
return function (this: any, ...args: Parameters<T>) {
const now = Date.now();
if (now - lastTime >= delay) {
lastTime = now;
return fn.apply(this, args);
}
};
}
防抖
防抖函数：在指定时间内只执行最后一次
debounce.ts
function debounce<T extends (...args: any[]) => any>(fn: T, delay: number): (...args: Parameters<T>) => void {
let timer: number | null = null;
return function (this: any, ...args: Parameters<T>) {
if (timer) clearTimeout(timer);
timer = setTimeout(() => {
fn.apply(this, args);
}, delay);
};
}