防抖节流简单版（立即执行和延时执行）

 

.

  /**
   * @param {fn} 
   * @param {time} 时间间隔ms
   * @param {isRun}  是否立即执行：true false
   * @return {*}
   */

　/**
　 * 防抖
　 */
  function fangDou(fn, time, isRun){
    let timer = null;
    return function(...arg){
      if(timer){
        clearTimeout(timer)
      }else{
        isRun && fn(...arg)
      }
      timer = setTimeout(()=>{
        timer = null;
        isRun || fn(...arg)
      }, time)
    }
  }

  /**
   * 节流
   */
  function jieLiu(fn, time, isRun){
    let timer = null;
    return function(...arg){
      if(!timer){
        isRun && fn(arg)
        timer = setTimeout(()=>{
          timer = null;
          isRun || fn(...arg)
        }, time)
      }
    }
  }