父页面
<template>

<DatePicker @child="child" :searchInfo='searchInfo'></DatePicker>

<script>methods

            // 接收子组件发送的值
            child(data){
                if(data.type == 'start') {
                    this.searchInfo.startTimeStamp = data.timeVal
                } else {
                    this.searchInfo.endTimeStamp = data.timeVal
                }
            },

子组件<script>methods
定义send方法

        // 发送给父组件的方法
        send(data){
            let params = {
                type: data
            }
            if(data == 'start') {
                params.timeVal = this.startTime
                this.$emit("child", params)
            } else if(data == 'end') {
                params.timeVal = this.endTime
                this.$emit("child", params)
            }
            
        },

调用send方法

        onStartTimeChange(startTime, type) {
            // console.log(startTime)
            this.endTimeOption = {
                disabledDate(endTime) {
                    return (
                        endTime < new Date(startTime)
                    );
                }
            };
            this.send('start');
        },
        onEndTimeChange(endTime, type) {
                //  console.log(endTime)

            this.startTimeOption = {
                disabledDate(startTime) {
                    return (
                        startTime > new Date(endTime) || startTime > Date.now()
                    );
                }
            };
            this.send('end');
        }