费不多说，直接代码：
`
// pages/test1/test1.js
var num = 10,
interval = null,
min = 0;
Page({
/**
* 页面的初始数据
*/
data: {
time:10
},
onClickTimeStart(){
startTime();
}
,
startTime: function(){
console.log("开始点击");
var that = this;
interval = setInterval(function(){
console.log(num + "-- 循环次数");
num--;
if(num <= min){
clearInterval(interval);
wx.showToast({
title: '结束了',
icon: '',
image: '',
duration: 1,
mask: true,
success: function(res) {},
fail: function(res) {},
complete: function(res) {},
})
}
that.setData({time:num})
},1000);
}
})
`
