入坑微信小程序必经之路（三）日期选择组件

<view class="pro-section">
  <text style="float:left;margin-left:-30rpx;">申请日期：</text>
 <view class="section" style="float:left;width:70%;">
  <picker mode="date" value="{{date}}" start="2021-1-1" end="2030-1-1" bindchange="binddateChange1" id='dateTime'>
  <!-- 在js中判断所选picker的id为startTime时，将value赋值给startTime，放在input内 -->
   <view class="picker" style="margin-top:-2rpx;">
     <input placeholder='申请时间' value='{{ApplyForTime}}' name="dateTime"></input>
   </view>
  </picker>
 </view>
</view>

data:{
ApplyForTime:'',
},
binddateChange1:function(e){
    //获取当前选择日期
    if (e.currentTarget.id=="dateTime") {
      this.setData({ApplyForTime:e.detail.value});
     }
  },

　　在utils文件夹里添加dateTimePicker.js,

1	`const` `util = require("../../../utils/dateTimePicker");`

　　下方：dateTimePicker.js,

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
}