let date = new Date()
// 获取服务器时区
let offsetTime = date.getTimezoneOffset() * 60 * 1000
// 根据当天获取本月第一天和最后一天
let firstDay = new Date(date.getFullYear(), date.getMonth(), 1)
let lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0)
// 转换为ISO格式,可以赋值给组件
firstDay.setTime(firstDay.getTime() - offsetTime)
lastDay.setTime(lastDay.getTime() - offsetTime)
this.dateRange = [firstDay.toJSON(), lastDay.toJSON()]