关于定时器的一个小东西

var duration = "3000";
    var durGo = 2000;
    var timer = '';
    if(data.status == 200){
     mui.toast(data.msg,{"duration": duration});
     timer = setTimeout(function(){
      　　window.open(window.location.origin + "/air/air-order", "_self");
     },durGo);
     setTimeout(function(){clearTimeout(timer);},durGo);
     
    }