.
├── Datepicker.vue
├── LICENSE
├── README.md
├── dist
│ └── vue-datepicker.js
├── index.js
├── package.json
└── webpack.config.js

<template>
 <div class="date-picker">
  <div class="input" v-text="value" @click="panelState = !panelState">
 </div>
 <div class="date-panel" v-show="panelState">
 </div>
</template>

<scrip>
 export default {
  data () {
   return {
    panelState: false //初始值，默認(rèn)panel關(guān)閉
   }
  },
  props: {
   value: String
  }
 }
</script>

computed: {
 dateList () {
  //獲取當(dāng)月的天數(shù)
  let currentMonthLength = new Date(this.tmpMonth, this.tmpMonth + 1, 0).getDate()
  //先將當(dāng)月的日期塞入dateList
  let dateList = Array.from({length: currentMonthLength}, (val, index) => {
   return {
    currentMonth: true,
    value: index + 1
   }
  })
  //獲取當(dāng)月1號(hào)的星期是為了確定在1號(hào)前需要插多少天
  let startDay = new Date(this.year, this.tmpMonth, 1).getDay()
  //確認(rèn)上個(gè)月一共多少天
  let previousMongthLength = new Date(this.year, this.tmpMonth, 0).getDate()
 }
 //在1號(hào)前插入上個(gè)月日期
 for(let i = 0, len = startDay; i < len; i++){
  dateList = [{previousMonth: true, value: previousMongthLength - i}].concat(dateList)
 }
 //補(bǔ)全剩余位置
 for(let i = 0, item = 1; i < 42; i++, item++){
  dateList[dateList.length] = {nextMonth: true, value: i}
 }
 return dateList
}

<ul class="date-list">
 <li v-for="item in dateList"
  v-text="item.value" 
  :class="{preMonth: item.previousMonth, nextMonth: item.nextMonth,
   selected: date === item.value && month === tmpMonth && item.currentMonth, invalid: validateDate(item)}"
  @click="selectDate(item)">
 </li>
</ul>

data () {
 return {
  yearList: Array.from({length: 12}, (value, index) => new Date().getFullYear() + index)
 }
}

<div>
 <div class="type-year" v-show="panelType === 'year'">
  <ul class="year-list">
   <li v-for="item in yearList"
    v-text="item"
    :class="{selected: item === tmpYear, invalid: validateYear(item)}" 
    @click="selectYear(item)"
   >
   </li>
  </ul>
 </div>
 <div class="type-month" v-show="panelType === 'month'">
  <ul class="month-list">
   <li v-for="item in monthList"
    v-text="item | month language"
    :class="{selected: $index === tmpMonth && year === tmpYear, invalid: validateMonth($index)}" 
    @click="selectMonth($index)"
   >
   </li>
  </ul>
 </div>
 <div class="type-date" v-show="panelType === 'date'">
  <ul class="date-list">
   <li v-for="item in dateList"
    v-text="item.value" 
    track-by="$index" 
    :class="{preMonth: item.previousMonth, nextMonth: item.nextMonth,
     selected: date === item.value && month === tmpMonth && item.currentMonth, invalid: validateDate(item)}"
    @click="selectDate(item)">
   </li>
  </ul>
 </div>
</div>

selectMonth (month) {
 if(this.validateMonth(month)){
  return
 }else{
  //臨時(shí)變量
  this.tmpMonth = month
  //切換panel狀態(tài)
  this.panelType = 'date'
 }
},
selectDate (date) {
 //validate logic above...
 //一次性全部賦值
 this.year = tmpYear
 this.month = tmpMonth
 this.date = date.value
 this.value = `${this.tmpYear}-${('0' + (this.month + 1)).slice(-2)}-${('0' + this.date).slice(-2)}`
 //選擇完日期后，panel自動(dòng)隱藏
 this.panelState = false
}

<datepicker :value.sync="start"></datepicker>
<!-- 現(xiàn)在min的值會(huì)隨著start的變化而變化 -->
<datepicker :value.sync="end" :min="start" ></datepicker>

new Date(2015, 0, 0).getTime() === new Date(2014, 11, 31).getTime() //true
new Date(2015, 12, 0).getTime() === new Date(2016, 0, 0).getTime() //true

validateDate (date) {
 let mon = this.tmpMonth
 if(date.previousMonth){
  mon -= 1
 }else if(date.nextMonth){
  mon += 1
 }
 if(new Date(this.tmpYear, mon, date.value).getTime() >= new Date(this.minYear, this.minMonth - 1, this.minDate).getTime()
  && new Date(this.tmpYear, mon, date.value).getTime() <= new Date(this.maxYear, this.maxMonth - 1, this.maxDate).getTime()){
  return false
 }
 return true
}

ready () {
 if(this.$el.parentNode.offsetWidth + this.$el.parentNode.offsetLeft - this.$el.offsetLeft <= 300){
  this.coordinates = {right: '0', top: `${window.getComputedStyle(this.$el.children[0]).offsetHeight + 4}px`}
 }else{
  this.coordinates = {left: '0', top: `${window.getComputedStyle(this.$el.children[0]).offsetHeight + 4}px`}
 }
}
<!-- template中對(duì)應(yīng)的動(dòng)態(tài)style -->
<div :style="coordinates"></div>

<div :style="this.coordinates" v-show="panelState" transition="toggle"></div>

//less syntax
.toggle{
 &-transition{
  transition: all ease .2s;
 }
 &-enter, &-leave{
  opacity: 0;
 }
}

<ul class="weeks">
  <li v-for="item in weekList" v-text="item | week language"></li>
 </ul>
 
filters : {
 week (item, lang){
  switch (lang) {
   case 'en':
    return {0: 'Su', 1: 'Mo', 2: 'Tu', 3: 'We', 4: 'Th', 5: 'Fr', 6: 'Sa'}[item]
   case 'ch':
    return {0: '日', 1: '一', 2: '二', 3: '三', 4: '四', 5: '五', 6: '六'}[item]
   default:
    return item
  }
 }
}

//App.vue
<script>
 import datepicker from 'path/to/datepicker.vue'
 export default {
  components: { datepicker}
 }
</script>

//index.html
<html>
 <script src="path/to/vue.js"></script>
 <script src="path/to/datepicker.js"></script>
 <body>
  <div id="app"></div>
  <script>
   new Vue({
    el: '#app',
    components: { datepicker }
   })
  </script>
 </body>
</html>

module.exports = {
 entry: './index.js',
 output: {
  path: './dist',
  library: 'datepicker',
  filename: 'vue-datepicker.js',
  libraryTarget: 'umd'
 },
 module: {
  loaders: [
   {test: /\.vue$/, loaders: ['vue']},
   {test: /\.js$/, exclude: /node_modules/, loaders: ['babel']}
  ]
 }
}

//修改前
<div class="month-box" @click="chType('month')" v-text="tmpMonth + 1 | month language"></div>
//修改后，filter傳參的方式也變了，變成了函數(shù)調(diào)用的風(fēng)格
<div class="month-box" @click="chType('month')">{{tmpMonth + 1 | month(language)}}</div>

<li v-for="item in monthList" @click="selectMonth($index)"></li>
//
<li v-for="(item, index) in monthList" @click="selectMonth(index)"></li>

//1.x版本，設(shè)置了value的值會(huì)同步到父級(jí)
this.value = `${this.tmpYear}-${('0' + (this.month + 1)).slice(-2)}-${('0' + this.date).slice(-2)}`

//2.x版本，需要自己觸發(fā)input事件，將新值作為參數(shù)傳遞回去
let value = `${this.tmpYear}-${('0' + (this.month + 1)).slice(-2)}-${('0' + this.date).slice(-2)}`
this.$emit('input', value)