精确到毫秒
let date = new Date()
let timeStamp = date.getTime()
console.log(timeStamp) // 1606704849115
精确到毫秒
let date = new Date()
let timeStamp = date.valueOf()
console.log(timeStamp) // 1606704906237
精确到秒,毫秒会用000替代
let date = new Date()
let timeStamp = Date.parse(date)
console.log(timeStamp) // 1606705009000