只需要给标签加上pickerOptions，当前时间日期选择器特有的选项参考下表

<el-date-picker
	v-model="FormData.time"
	value-format="yyyy:MM:DD"
	:picker-options="pickeroptions"
	type-"daterange"
	range-separator="至"
	start-placeholder="开始日期"
	end-placeholder="结束日期"
</el-date-picker>

// 方法一：时间跨度为之前一年
 pickerOptions:{
   disabledDate: () => false,
   onPick: ({ maxDate, minDate }) => {
     if (minDate && !maxDate) {
       const oneYear = 365 * 24 * 60 * 60 * 1000;
       this.pickerOptions.disabledDate = time => {
       return time.getTime() < minDate.getTime() || time.getTime() > minDate.getTime() + oneYear;
       };
     } else {
       this.pickerOptions.disabledDate = () => false;
     }
   },
},

//方法二：
pickDate:"",
pickerOptions:{
	onPick: this.getPickDate,
	disabledDate:this.disabledDate
}

methods:{
	getPickDate(pick){
		this.pickDate = pick
	},
	disabledDate(date){
		const {minDate,maxDatel}= this.pickDate,
		if(minDate && !maxDate){
			const diff = Math.abs(minDate.valueof()- date.valueof())
			if(diff >1000*3600*24*365){
				return true;
			}
		}
	}
}