datepicker插件监听输入框

 <label class="fl">日期：</label>
 <p class="input-wrapper fr">
 <input class="daterangepicker" ref="datepicker" v-model="dateRange"/>
 <a href="javascript:;" rel="external nofollow" ></a>
 </p>
export default {
 data() {
 return {
 dateRange: ''
 }
 },
 watch: {
 dateRange(newVal, oldVal) {
 console.log(newVal) // 选择日期后无法监听dateRange的改变
 }
 }
}

data() {
 return {
 date: '',
 beginDate: '',
 endDate: ''
 }
 },
mounted () {
 $('.daterangepicker').dateRangePicker({
 autoClose: true,
 format: 'YYYY-MM-DD'
 }).bind('datepicker-change', this.setDate) //插件自带方法，选择日期后触发回调
 },
methods: {
 setDate() {
 let datepicker = this.$refs.datepicker
 //这一步是关键，具体说明可以参见vue api手册
 this.$set(this.date, 'beginDate', datepicker.value)
 this.$set(this.date, 'endDate', datepicker.value)
 this.beginDate = this.date.beginDate.slice(0, 11)
 this.endDate = this.date.endDate.slice(-10)
 } 
 },
 watch: {
 // 这里就可以监听数据变化啦，可以愉快的选择日期了！
 beginDate(newVal, oldVal) {
 this.$emit( 'beginDateChange', newVal )
 },
 endDate(newVal, oldVal) {
 this.$emit( 'endDateChange', newVal )
 }
 }