微信小程序小工具之下发短信验证码倒计时

目标： 
按钮倒计时 
步骤： 
用户点击按钮，提示下发短信，按钮进行倒计时 
代码： 
wxml
<view>
<input type="number" name="linkTel" bindblur="blurTel" value="{{agentTel}}" placeholder="*手机号码" maxlength="11" />
</view>
<button  bindtap="setVerify">{{VerifyCode}}</button>
js
  blurTel: function (e) {
    var linkTel = e.detail.value.replace(/\s/g, "");
    this.setData({
      linkTel: linkTel
    })
  },
setVerify: function (e) {//发送验证码
    var linkTel = this.data.linkTel;
    var _Url = "申请下发短信的地址";
    var total_micro_second = 60 * 1000;
    //验证码倒计时
    count_down(this, total_micro_second);
    wx.request({
      url: _Url,
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      data: [{
        agentLinktel: linkTel
      }],
      success: function (res) {
        if (res.data.code == "00") {
          wx.showModal({
            title: '提示',
            content: '发送验证码成功！',
            showCancel: false
          })
        }
      },
      fail: function (res) {
        console.log("error res=")
        console.log(res.data)
      }
    });
  }
//下面的代码在page({})外面
/* 毫秒级倒计时 */
function count_down(that, total_micro_second) {
  if (total_micro_second <= 0) {
    that.setData({
      VerifyCode: "重新发送"
    });
    // timeout则跳出递归
    return;
  }
  // 渲染倒计时时钟
  that.setData({
    VerifyCode: date_format(total_micro_second) + " 秒"
  });
  setTimeout(function () {
    // 放在最后--
    total_micro_second -= 10;
    count_down(that, total_micro_second);
  }, 10)
}
// 时间格式化输出，如03:25:19 86。每10ms都会调用一次
function date_format(micro_second) {
  // 秒数
  var second = Math.floor(micro_second / 1000);
  // 小时位
  var hr = Math.floor(second / 3600);
  // 分钟位
  var min = fill_zero_prefix(Math.floor((second - hr * 3600) / 60));
  // 秒位
  var sec = fill_zero_prefix((second - hr * 3600 - min * 60));// equal to => var sec = second % 60;
  // 毫秒位，保留2位
  var micro_sec = fill_zero_prefix(Math.floor((micro_second % 1000) / 10));
  return sec;
}
// 位数不足补零
function fill_zero_prefix(num) {
  return num < 10 ? "0" + num : num
}