el-date-picker 开始时间选定后，结束时间不可选择开始时间之前的日期
<el-date-pickerv-model="startTime"name="startTime"value-format="yyyy-MM-dd"type="date"@change="activityStartTime"placeholder="请选择开始日期":picker-options="pickerOptions"/>
<el-date-pickerv-model="endTime"name="endTime"value-format="yyyy-MM-dd"type="date"@change="activityEndTime"placeholder="请选择结束日期":picker-options="pickerOptions1"/>data(){return{startTime:new Date(new Date - 1000*60*60*24*31)，toLocaleDateString().split('/').map(item=>{if(item<10){return '0'+item}else{return item}}).join('-'),endTime:new Date().toLocaleDateString().split('/').map(item=>{if(item<10){return '0'+item}else{return item}}).join('-'),pickerOptions:{},pickerOptions1:{}}
}activityStartTime(val){this.pickerOptions1 = Object.assign({}, this.pickerOptions,{disabledDate: time => {return (new Date(time).getTime() <= new Date(this.startTime))}})
}activityEndTime(val){if(!value){this.pickerOptions = Object.assign({}, this.pickerOptions1,{disabledDate: time => {return time.getTime() >= new Date("2999-12-30 23:59:59").getTime();}})return}this.pickerOptions = Object.assign({}, this.pickerOptions1,{disabledDate: time => {return (time.getTime() >new Date(this.endTime).getTime() - 24*3600*1000)}})
}参考：
1、el-date-picker中日期选择器时间限制，限制选择30天时间范围且不大于当前时间 ； 时间范围只能选择1天；时间范围在某一段时间内
2、el-date-picker日期的限制