js如何计算两个日期之间间隔了多少天？

this.startDate = this.$moment(this.form.date_time[0]).format('YYYY-MM-DD')
            this.endDate = this.$moment(this.form.date_time[1]).format('YYYY-MM-DD')
const sDate = Date.parse(this.startDate)
const eDate = Date.parse(this.endDate)
const days = (eDate - sDate) / (1 * 24 * 60 * 60 * 1000) //间隔时间