<!--index.wxml-->
<view class="container">
 <text>倒计时: {{second}} </text>
</view>

//index.js
// 从从60到到0倒计时
function countdown(that) {
 var second = that.data.second
 if (second == 0) {
  that.setData({
   second: "60秒倒计时结束"
  });
  return ;
 }
 var time = setTimeout(function(){
  that.setData({
   second: second - 1
  });
  countdown(that);
 }
 ,1000)
}
Page({
  data: {
    second: 60
  },
  onLoad: function() {
    countdown(this);
  }
});