基于Vue组件化的日期联动选择器功能的实现代码

// timestamp 为时间戳
new Date(timestamp)
//获取到时间标砖对象，如：Sun Sep 02 2018 00:00:00 GMT+0800 (中国标准时间)
/*
 获取年： new Date(timestamp).getFullYear()
 获取月： new Date(timestamp).getMonth() + 1
 获取日： new Date(timestamp).getDate() 
 获取星期几： new Date(timestamp).getDay() 
*/

//三种形式
 new Date('2018-9-2').getTime()
 new Date('2018-9-2').valueOf()
 Date.parse(new Date('2018-9-2'))

watch: {
 currentDate: {
  handler(newValue, oldValue) {
  this.judgeDay(); //更新当前天数
  this.emitDate(); //发送结果至父组件或其他地方
  },
  deep: true
 }
}

judgeDay() {
 if ([4, 6, 9, 11].indexOf(this.currentDate.month) !== -1) {
 this.normalMaxDays = 30; //小月30天
 if (this.currentDate.day && this.currentDate.day == 31) {
  this.currentDate.day = ""; 
 }
 } else if (this.currentDate.mOnth== 2) {
 if (this.currentDate.year) {
  if (
  (this.currentDate.year % 4 == 0 &&
   this.currentDate.year % 100 != 0) ||
  this.currentDate.year % 400 == 0
  ) {
  this.normalMaxDays = 29; //闰年2月29天
  } else {
  this.normalMaxDays = 28; //平年2月28天
  }
 } else {
  this.normalMaxDays = 28; //平年2月28天
 }
 } else {
 this.normalMaxDays = 31; //大月31天
 }
}

emitDate：
emitDate() {
 let timestamp; //暂默认传给父组件时间戳形式
 if ( this.currentDate.year && this.currentDate.month && this.currentDate.day) {
  let mOnth= this.currentDate.month <10 &＃63; ('0'+ this.currentDate.month):this.currentDate.month;
  let day = this.currentDate.day <10 &＃63; ('0'+ this.currentDate.day):this.currentDate.day;
  let dateStr = this.currentDate.year + "-" + month + "-" + day;
  timestamp = new Date(dateStr).getTime();
 } 
 else {
  timestamp = "";
 }
 this.$emit("dateSelected", timestamp);//发送给父组件相关结果
},

watch: {
 normalMaxDays() {
  this.getFullDays();
  if (this.currentDate.year && this.currentDate.day > this.normalMaxDays) {
  this.currentDate.day = "";
  }
 }
}