重写 window.setTimeout ，收集所有的 timerId，清除页面上所有定时器

override-settimeout.js

function overrideSetTimeout(fn) {
  let timerIds = [];

  function realSetTimeout(callback, delay) {
    const args = Array.prototype.slice.call(arguments, 2)
    const timerId = fn(() => {
      callback.apply(null, args)
    }, delay)
    
    timerIds.push(timerId);
    
    

    return {
      clear: () => {
        clearTimeout(timerId);
        const index = timerIds.findIndex(id => id === timerId);
        timerIds.splice(index, 1);
      },
      clearAll: clearAll
    };
  }

  realSetTimeout.clearAll = clearAll;
  realSetTimeout.getTimerIds = () => {
    return timerIds;
  };

  return realSetTimeout;

  function clearAll() {
    for (const id of timerIds) {
      clearTimeout(id);
    }
    timerIds = [];
  }
}

const setTimout = overrideSetTimeout(window.setTimeout);

const singleTimeout = setTimout((whom) => {
  console.log("hello", whom);
}, 2000, 'world');

// singleTimeout.clear(); // 清除单个定时器

// setTimout.clearAll(); // 清除所有定时器

setTimout.getTimerIds(); // 获取所有定时器 id