1. // 防抖
    2. const debounce = (fn, delay) => {
    3.   let timer = null
    4.   return function () {
    5.     const args = arguments
    6.     clearTimeout(timer)
    7.     timer = setTimeout(() => {
    8.       fn.apply(this, args)
    9.     }, delay)
    10.   }
    11. }
    13. // 节流
    14. const throttle = (fn, delay) => {
    15.   let timer = null
    16.   return function () {
    17.     const args = arguments
    18.     if (timer) return
    19.     timer || fn.apply(this, args)
    20.     timer = setTimeout(() => {
    21.       timer = null
    22.     }, wait)
    23.   }
    24. }