系统中需要一个月份日期范围
<el-date-picker
v-model="startDate"
class="datePicker"
type="daterange"
range-separator="至"
start-placeholder="开始日期"
popper-class="date-style"
value-format="yyyy-MM-dd"
:picker-options="yearTime"
end-placeholder="">
</el-date-picker>