wepy 小程序定时器，验证码倒计时 数据绑定页面无刷新

每次改变数据的时候记得调用 this.$apply()

验证码倒计时

使用的vant-weapp UI组件

wxml：

1    <van-col span="10" >
3             <view wx:if="{{sendAuthCode}}"bindtap="getCode()">获取验证码</view>
6             <view wx:elif="{{!sendAuthCode}}">{{auth_time}}S</view>
8     </van-col>

JS：

 1 data = {
 2     auth_time: 5,//倒计时
 3     sendAuthCode: true,//控制获取验证码
 4   };
 5 methods = {
 6     getCode () {//获取验证码
 7       let that = this
 8       this.sendAuthCode = false
 9       var auth_timetimer = setInterval(() => {
10         this.auth_time--;
11         that.$apply()
12         console.log(this.auth_time)
13         if (this.auth_time <= 0) {
14           this.sendAuthCode = true;
15           that.$apply()
16           clearInterval(auth_timetimer);
17         }
18       }, 1000)
19     }
20 }