var time1 = Date.parse(new Date()) //精确到秒
var time2 = new Date().getTime() //精确到毫秒
var time3 = new Date().valueOf() //精确到毫秒
var time4 = Date.now() //精确到毫秒
var time5 = +new Date() //会将时间转换称number进行计算
console.log(time1) //1626430837000
console.log(time2) //1626430837152
console.log(time3) //1626430837152
console.log(time4) //1626430837152
console.log(time5) //1626430837152
