细说节流和防抖

//节流1
function throttel(name="随便起",time=2000,msg="点击的速度太快了"){
	return new Promise((resolve,reject)=>{
		if(this[name]){
			console.log(`${msg}`)
			return false;
		}
		this[name]=true;
		setTimeout(()=>{
			this[name]=false;
		},time);
		resolve()
	})
}
//使用
button.onclick=()=>{
	throttel(`随便起`).then(()=>{
		console.log('这里写事件')
	})
}

//节流2
function throttle(fun, delay = 1000) {
  let last, deferTimer;
   return function (args) {
       let that = this;
       let _args = arguments;
       let now = +new Date();
       if (last && now < last + delay) {
           clearTimeout(deferTimer);
           deferTimer = setTimeout(function () {
           last = now;
              fun.apply(that, _args);
          }, delay)
        } else {
             last = now;
             fun.apply(that, _args);
         }
      }
  }

  function fn(){
      console.log(111);
  }
  button.onclick=throttle(fn,2000)

//防抖
function debounce(fun, delay = 200) {
    return function (args) {
        //获取函数的作用域和变量
        let that = this
        let _args = args
        //每次事件被触发，都会清除当前的timeer，然后重写设置超时调用
        clearTimeout(fun.id)
        fun.id = setTimeout(function () {
            fun.call(that, _args)
        }, delay)
    }
}

function fn(){
    console.log(111);
}
button.onclick=debounce(fn,2000)