最简单的防抖和节流防抖节流时间戳实现定时器实现,面试出现的频率巨高，所以还是需要牢牢掌握的。。。。。。。。。。。。

防抖

function debounce(fn, t){
  let flag = null
  return function (...args) {
    clearTimeout(flag)
    flag = setTimeout(() => {
      fn.apply(this, args)
    }, t)
  }
}

节流

时间戳实现

function throttle(fn, wait){
  let pre = Date.now()

  return function(...args){
      
    let now = Date.now()

    if(now - pre >= wait){
      fn.apply(this, args)
      pre = Date.now()
    }
  }
}

定时器实现

function throttle(fn, wait){
  let timer = null;
  return function(...args){
    
    if(!timer) {
      timer = setTimeout(() => {
        fn.apply(this, args);
        timer = null;
      }, wait)
    }
  }
}