微信小程序项目实践之验证码倒计时功能

<view class='centerRow'>
 <view class='inputLabel'>动态码:</view>
 <input class='inputStyle' style="flex:1 " bindinput="bindKeyInput" placeholder="短信动态码" adjust-position='false'  confirm-type='search'></input>
 <button class="emailCode" hidden='{{!codeIsCanClick}}' size="mini" bindtap='clickCode'>获取动态码</button>
 <button class="emailCodeSend" hidden='{{codeIsCanClick}}' size="mini">{{last_time}}秒后重新发送</button>
</view>

.centerRow{
 display: flex;
 flex-direction: row;
 align-items: center;
 height: 44px;
 padding-left: 16px;
 padding-right: 16px;
 border-bottom: 1rpx solid #D9D9D9;
 border-top: 1rpx solid #D9D9D9;
}
.inputStyle{
 border-radius:4px;
 color:#D9D9D9;
 outline:0;
 padding-left: 4px;
 margin-left: 4px;
 margin-right: 20rpx;
 font-size: 14px;
}
.inputLabel{
 font-size: 16px;
 color: #33496D;
 width: 90px;
}
.emailCode{
 width: 118px;
 height: 28px;
 align-items: center;
 justify-content: center;
 display: flex;
 flex-direction: row;
 color:white;
 font-size: 14px;
 background-color: #50A2EC;
 border-radius: 14px;
}
.emailCodeSend{
 width: 118px;
 height: 28px;
 align-items: center;
 justify-content: center;
 display: flex;
 flex-direction: row;
 color:white;
 font-size: 14px;
 background-color: #B9DAF7;
 border-radius: 14px;
}

// 倒计时事件 单位s
var countdown = 10;
var settime = function (that) {
 if (countdown == 0) {
 that.setData({
  codeIsCanClick: true
 })
 countdown = 10;
 return;
 } else {
 that.setData({
  codeIsCanClick: false,
  last_time: countdown
 })
 countdown--;
 }
 setTimeout(function () {
 settime(that)
 }, 1000
 )
}
Page({
 /**
 * 页面的初始数据
 */
 data: {
 codeIsCanClick: true
 },
 /**
 * 点击验证码按钮
 */
 clickCode: function () {
 var that = this;
 settime(that)
 },