1、wxml代码

<!--index.wxml-->
<view class="container">
  <button type='primary' style='margin-bottom:40px;' bindtap='startSetInter'>开始</button>
  <button type='primary' bindtap='endSetInter'>结束</button>
</view>

2、js代码

　　将计时器赋值给 data 中的变量，这样在任何方法中都可以清除计时器

Page({
  data: {
	  //存储计时器
	setInter:'',
	num:1,
  },
  onLoad: function () {
	  var that = this;
	  
  },
  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)
  },

})