JS 日期轉字符串

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

// 格式化日期，如月、日、時、分、秒保證為2位數
function formatNumber (n) {
 n = n.toString()
 return n[1] ? n : '0' + n;
}
// 參數number為毫秒時間戳，format為需要轉換成的日期格式
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;
}

調用：

var a=new Date() ; 
//傳入格式為數字類型
formatTime(a.getTime(),'Y-M-D h:m:s')
//臨時調用如下

let start = new Date();
start = start.getFullYear() + '.' + (start.getMonth()) + '.' + start.getDay();