小程序——日期时间选择器（自定义精确到分秒）

效果图：

需求：预计进场时间，精确到秒；
需要实现一个时间日期的选择器，但是小程序的picker组件只支持五种选择器，分别是普通选择器、多列选择器、时间选择器、日期选择器、省市区选择器。并没有我需要的时间日期的选择器，于是就找了一个.
实现方法：
wxml:

  <picker mode="multiSelector" value="{{dateTime}}" bindchange="changeDateTime" range="{{dateTimeArray}}">
    <view class="selectDate tui-picker-detail">
      {{estimate_in_time ? estimate_in_time : '请选择进场时间'}}
    </view>
    <view class="caleander">
      <image src="/images/home/stock/caleander.png" class="caleanderPic"></image>
    </view>
  </picker>

js

import dateTimePicker from '../../../utils/dateTimePicker.js';
Page({
	data: {
    	estimate_in_time: '',
    	dateTime: null,
    	dateTimeArray: null,
    	startYear: new Date().getFullYear(),
    	endYear: new Date().getFullYear() + 10,
	},
  changeDateTime(e) {
    this.setData({
      dateTime: e.detail.value
    });
    var arr = this.data.dateTime,
      dateArr = this.data.dateTimeArray;
    // arr[e.detail.column] = e.detail.value;
    dateArr[2] = dateTimePicker.getMonthDay(dateArr[0][arr[0]], dateArr[1][arr[1]]);
    
    var estimate_in_time = `${dateArr[0][arr[0]]}-${dateArr[1][arr[1]]}-${dateArr[2][arr[2]]} ${dateArr[3][arr[3]]}:${dateArr[4][arr[4]]}:${dateArr[5][arr[5]]}`;
    this.setData({
      dateTimeArray: dateArr,
      dateTime: arr,
      estimate_in_time,
    });
  },
   /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function(options) {
    // 获取完整的年月日 时分秒，以及默认显示的数组
    var obj = dateTimePicker.dateTimePicker(this.data.startYear, this.data.endYear);
    var obj1 = dateTimePicker.dateTimePicker(this.data.startYear, this.data.endYear);
    // 精确到分的处理，将数组的秒去掉
    var lastArray = obj1.dateTimeArray.pop();
    var lastTime = obj1.dateTime.pop();
    this.setData({
      dateTime: obj.dateTime,
      dateTimeArray: obj.dateTimeArray
    });

  },
})

外部JS，dateTimePicker.js的引入

function withData(param){
  return param < 10 ? '0' + param : '' + param;
}
function getLoopArray(start,end){
  var start = start || 0;
  var end = end || 1;
  var array = [];
  for (var i = start; i <= end; i++) {
    array.push(withData(i));
  }
  return array;
}
function getMonthDay(year,month){
  var flag = year % 400 == 0 || (year % 4 == 0 && year % 100 != 0), array = null;

  switch (month) {
    case '01':
    case '03':
    case '05':
    case '07':
    case '08':
    case '10':
    case '12':
      array = getLoopArray(1, 31)
      break;
    case '04':
    case '06':
    case '09':
    case '11':
      array = getLoopArray(1, 30)
      break;
    case '02':
      array = flag ? getLoopArray(1, 29) : getLoopArray(1, 28)
      break;
    default:
      array = '月份格式不正确，请重新输入！'
  }
  return array;
}
function getNewDateArry(){
  // 当前时间的处理
  var newDate = new Date();
  var year = withData(newDate.getFullYear()),
      mont = withData(newDate.getMonth() + 1),
      date = withData(newDate.getDate()),
      hour = withData(newDate.getHours()),
      minu = withData(newDate.getMinutes()),
      seco = withData(newDate.getSeconds());

  return [year, mont, date, hour, minu, seco];
}
function dateTimePicker(startYear,endYear,date) {
  // 返回默认显示的数组和联动数组的声明
  var dateTime = [], dateTimeArray = [[],[],[],[],[],[]];
  var start = startYear || 1978;
  var end = endYear || 2100;
  // 默认开始显示数据
  var defaultDate = date ? [...date.split(' ')[0].split('-'), ...date.split(' ')[1].split(':')] : getNewDateArry();
  // 处理联动列表数据
  /*年月日 时分秒*/ 
  dateTimeArray[0] = getLoopArray(start,end);
  dateTimeArray[1] = getLoopArray(1, 12);
  dateTimeArray[2] = getMonthDay(defaultDate[0], defaultDate[1]);
  dateTimeArray[3] = getLoopArray(0, 23);
  dateTimeArray[4] = getLoopArray(0, 59);
  dateTimeArray[5] = getLoopArray(0, 59);

  dateTimeArray.forEach((current,index) => {
    dateTime.push(current.indexOf(defaultDate[index]));
  });

  return {
    dateTimeArray: dateTimeArray,
    dateTime: dateTime
  }
}
module.exports = {
  dateTimePicker: dateTimePicker,
  getMonthDay: getMonthDay
}