<JS>温故而知新

节流

每N秒触发、用于触发

const throttle = (fn, delay) => {
        let timer = null;
        let flag = true;
        return () => {
            if (!flag){
                return;
            }
            flag = false;
            timer = setTimeout(() => {
                fn();
                flag = true;
            },delay)
        }
    };

防抖

最后一次触发 防止重复提交

	function debounce(fn, delay){
    	let timer = null;
        return () => {
        	if(timer) clearTimerOut(timer);
            const args = arguments;
            timer = setTimeOut({
            	fn.apply(this,args)
            }, delay)
        }
    }

call、apply、bind

改变this