来源地址：https://www.jb51.net/article/165003.htm

// 格式化日期，如月、日、时、分、秒保证为2位数function formatNumber (n) { n = n.toString() return n[1] ? n : ‘0‘ + n;}// 参数number为毫秒时间戳，format为需要转换成的日期格式function formatTime (number, format) { let time = new Date(number) let newArr = [] let formatArr = [‘Y‘, ‘M‘, ‘D‘, ‘h‘, ‘m‘, ‘s‘] newArr.push(time.getFullYear()) newArr.push(formatNumber(time.getMonth() + 1)) newArr.push(formatNumber(time.getDate())) newArr.push(formatNumber(time.getHours())) newArr.push(formatNumber(time.getMinutes())) newArr.push(formatNumber(time.getSeconds())) for (let i in newArr) { format = format.replace(formatArr[i], newArr[i]) } return format;}

调用：

var a=new Date() ; //传入格式为数字类型formatTime(a.getTime(),‘Y-M-D h:m:s‘)