小程序 使用定时器

 startSetInter:  function (){
      var  that =  this ;
      //将计时器赋值给setInter
      that.data.setInter = setInterval(
          function  () {
              var  numVal = that.data.num + 1;
              that.setData({ num: numVal });
              console.log( 'setInterval=='  + that.data.num);
          }
    , 2000);
  },
  endSetInter:  function (){
      var  that =  this ;
      //清除计时器  即清除setInter
      clearInterval(that.data.setInter)
  },
  onHide:  function  () {

  },
  onUnload:  function  () {
      var  that = this ;
      //清除计时器  即清除setInter
      clearInterval(that.data.setInter)
  },