使用Vue写一个datepicker的示例

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

 export default {
  data () {
   return {
    panelState: false //初始值，默认panel关闭
   }
  },
  props: {
   value: String
  }
 }

computed: {
 dateList () {
  //获取当月的天数
  let currentMonthLength = new Date(this.tmpMonth, this.tmpMonth + 1, 0).getDate()
  //先将当月的日期塞入dateList
  let dateList = Array.from({length: currentMonthLength}, (val, index) => {
   return {
    currentMonth: true,
    value: index + 1
   }
  })
  //获取当月1号的星期是为了确定在1号前需要插多少天
  let startDay = new Date(this.year, this.tmpMonth, 1).getDay()
  //确认上个月一共多少天
  let previousMongthLength = new Date(this.year, this.tmpMonth, 0).getDate()
 }
 //在1号前插入上个月日期
 for(let i = 0, len = startDay; i < len; i++){
  dateList = [{previousMonth: true, value: previousMongthLength - i}].concat(dateList)
 }
 //补全剩余位置
 for(let i = 0, item = 1; i < 42; i++, item++){
  dateList[dateList.length] = {nextMonth: true, value: i}
 }
 return dateList
}

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

selectMonth (month) {
 if(this.validateMonth(month)){
  return
 }else{
  //临时变量
  this.tmpMonth = month
  //切换panel状态
  this.panelType = 'date'
 }
},
selectDate (date) {
 //validate logic above...
 //一次性全部赋值
 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)}`
 //选择完日期后，panel自动隐藏
 this.panelState = false
}

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`}
 }
}

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

  

 
 
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

//index.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

//修改后，filter传参的方式也变了，变成了函数调用的风格
{{tmpMonth + 1 | month(language)}}

//

//1.x版本，设置了value的值会同步到父级
this.value = `${this.tmpYear}-${('0' + (this.month + 1)).slice(-2)}-${('0' + this.date).slice(-2)}`

//2.x版本，需要自己触发input事件，将新值作为参数传递回去
let value = `${this.tmpYear}-${('0' + (this.month + 1)).slice(-2)}-${('0' + this.date).slice(-2)}`
this.$emit('input', value)