防抖与节流

防抖：触发高频事件后 n 秒内函数只会执行一次，如果 n 秒内高频事件再次被触发，则重新计算时间。作用：防止事件连续或高频触发，让它只触发一次或者最后一次。

function debounce (fn, delay){
	let timer=null
	return function(){
		if(timer){
			clearTimeout(timer)
		}
		timer=setTimeout(()=>{
			fn.apply(this,arguments)
			timer=null
		},delay)
	}
}

let test=debounce(()=>{console.log(1)},5000)

节流：高频事件触发，但在 n 秒内只会执行一次，所以节流会稀释函数的执行频率。作用：降低事件触发的频率，比如2s 内最多执行一次。

function throttle(fn, wait){
	let last=0
	return function(){
		let now=+new Date()
		if(now-last>=wait){
			fn.apply(this,arguments)
			last=now
		}
	}
}

let test=throttle(()=>{console.log(2)},2000)

The issue mentions no target file, test, or entry point. First inspect the repository structure to find where JavaScript notes are kept; the work is done only when the intended debounce and throttle material is added there, but the issue does not define a specific location or acceptance check.