防抖与节流

[MaMaFish]

Debounce

function debounce (func, delay) {
  let timer
  return function (...args) {
    if (timer) {
      clearTimeout(timer)
    }
    timer = setTimeout(() => {
      func.apply(this, args)
    }, delay)
  }
}

Throttle

function throttle(fn, interval) {
  let flag = true;
  return funtion(...args) {
    if (!flag) return;
    flag = false;
    setTimeout(() => {
      fn.apply(this, args);
      flag = true;
    }, interval)
  }
}

或者用时间差的方式判断

functionn throttle(fn, interval) {
   let last = null
   return function (...args) {
     let now = Date.now()
     // 还没到时间
     if(now - last < interval) return
     last = now
     fn.apply(this, args)
   }
 }