throttle

throttle.md

  function throttle(fn,wait=3000){
		let lastTime = Date.now(),
			timeFlag = null
			
		return function(...args){
			let current = Date.now()
			
			clearTimeout(timeFlag)
			
			if(current - lastTime >= wait){
				fn.apply(this,args)
				lastTime = current
			}else{
				timeFlag = setTimeout(()=>{
					fn.apply(this,args)
					lastTime = current
				},wait)
			}
		}
	}