JavaScript定时任务

//定时任务
function Task(cnt, timeout, run) {
  function newInterval() {
    return window.setInterval(function () {
      if(i < cnt){
        try {
          run(i);
        } catch (e) {
          console.error(e);
        }
      } else {
        window.clearInterval(interval);
      }
      i++;
    },timeout);
  }
  var i = 0, interval;
  return {
    //如果已经在执行，则重新开始
    start: function () {
      if(interval){window.clearInterval(interval);}
      i = 0; interval = newInterval();
    }
    //中断任务
    , close: function () {
      if(interval){window.clearInterval(interval); delete interval;}
    }
  }
}

//循环执行10次，每次等待1秒
var task = new Task(10, 1000, function (i) {
  console.log(i);
})