微信小程序倒计时，小程序60秒倒计时，小程序倒计时防止重复点击

html部分
<view class="signIn">
  <view class="mainBody">
    <view class="title">手机号登录</view>
    <view class="weui-input">
      <input bindinput="adminNameInput" type="number" name="adminInput" value="{{adminInput}}" placeholder="请输入手机号码"/>
    </view>
    <view class="weui-input">
      <input bindinput="codeInput" maxlength="4" name="codeInput" value="{{codeInput}}" placeholder="请输入验证码"/>
      <button bindtap="sendCode" disabled="{{smsFlag}}" class="countDown">{{sendTime}}</button>
    </view>
    <view class="botMain">
        <view bindtap='noBtn'>退出</view>
        <view bindtap='okBtn'>登录</view>
    </view>
  </view>
</view>

css部分
.signIn{
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,.6);
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
}
.signIn .mainBody{
  background-color: #fff;
  width: 82%;
  margin: 0 auto;
  border-radius: 20rpx;
}
.signIn .botMain{
  display: flex;
  text-align: center;
  margin-top: 40rpx;
}
.signIn .botMain view{
  flex: 1;
  height: 90rpx;
  line-height: 90rpx;
  background-color: #ccc;
  color: #fff;
}
.signIn .botMain view:last-child{
  background-color: #0089ff;
}

.signIn .mainBody .title{
  font-size: 40rpx;
  padding: 30rpx 0;
}
.signIn .mainBody .weui-input{
  border: 1rpx solid #ccc;
  text-align: left;
  width: 70%;
  margin: 0 auto 20rpx;
  border-radius: 16rpx;
  height: 80rpx;
  line-height: 80rpx;
  padding: 0 30rpx;
  position: relative;
}
.signIn .mainBody .weui-input input{
  width: 100%;
  height: 100%;
  font-size: 28rpx;
}
.signIn .mainBody .weui-input .countDown{
  position: absolute;
  right: 0;
  top: 0;
  width: 200rpx;
  height: 77rpx;
  line-height: 77rpx;
  font-size: 26rpx;
  border: 0;
  border-radius: 16rpx;
  z-index: 11;
  background-color: #eee;
}
.signIn .mainBody .weui-input .countDown::after{
  border: 0;
}

js部分
data: {
    adminInput: '',
    sendTime: '',
    codeInput: '',
    sendTime: '获取验证码',
    sendColor: '#363636',
    snsMsgWait: 60,
  },
  onLoad: function () {
    
  },
  adminNameInput (e) {
    this.setData({
      adminInput: e.detail.value
    })
  },
  sendCode: function() {  
    console.log('获取验证码事件')
    let myreg=/^[1][3,4,5,7,8][0-9]{9}$/
    if(this.data.adminInput == "") {
      console.log('手机号不能为空')
    } else if(this.data.adminInput !== "" && myreg.test(this.data.adminInput) == false ) {
      console.log('请输入正确的手机号码')
    } else {
      console.log('成功')
      var inter = setInterval(function() {
        this.setData({
          smsFlag: true,
          sendTime: this.data.snsMsgWait + 's后重发',
          snsMsgWait: this.data.snsMsgWait - 1
        });
        if (this.data.snsMsgWait < 0) {
          clearInterval(inter)
        }
      }.bind(this), 500);
    }
  },
  codeInput (e) {
    this.setData({
      codeInput: e.detail.value
    })
  },