ant 日期选择器默认范围，当前时间倒推30天

let dayTime = new Date()
let lw = new Date(dayTime - 1000 * 60 * 60 * 24 * 30)
this.range[1] = dayTime.getFullYear() + '-0' + (dayTime.getMonth() + 1) + '-' + dayTime.getDate()
this.range[0] = lw.getFullYear() + '-0' + (lw.getMonth() + 1) + '-' + lw.getDate()