防抖

const debounce = (fn,time)=>{
    let timer = null
    return ()=>{
        if(timer){
            clearTimeout(timer)
        }
        timer = setTimeout(()=>{
            fn()
            timer = null
        },time)
    }
}
//使用
const tp = debounce(()=>{
  console.log('tp了')
},3000)

节流

const throttle = (fn, time) => {
  let timer = null;
  return (...args) => {
    if (timer) {
      return;
    }
    fn.call(undefined,...args)
    timer = setTimeout(() => {
        timer = null
    }, time);
  };
};
//使用
const coodown = throttle(()=>{
  console.log('cd 中')
},3000)