JavaScript时间与时间戳的转换操作实例分析

var timestamp1 = Date.parse(new Date());
// 结果1544151187000 不推荐这种办法，毫秒级别的数值被转化为000
console.log(timestamp1);

var timestamp2 = (new Date()).valueOf();
// 结果1544151187152 通过valueOf()函数返回指定对象的原始值获得准确的时间戳值
console.log(timestamp2);

var timestamp3 = new Date().getTime();
// 结果1544151187152 ，通过原型方法直接获得当前时间的毫秒值，准确
console.log(timestamp3);

var timetamp4 = Number(new Date()) ;
//结果1544151187152 ,将时间转化为一个number类型的数值，即时间戳
console.log(timetamp4);

var timetamp5 = Date.now();
//结果1544151187152 
console.log(timetamp5);

var timestamp4 = new Date(1544151250236);//直接用 new Date(时间戳) 格式转化获得当前时间
console.log(timestamp4);
console.log(timestamp4.toLocaleDateString().replace(/\//g, "-") + " " + timestamp4.toTimeString().substr(0, 8)); //再利用拼接正则等手段转化为yyyy-MM-dd hh:mm:ss 格式

function getdate() {
  var now = new Date(),
    y = now.getFullYear(),
    m = ("0" + (now.getMonth() + 1)).slice(-2),
    d = ("0" + now.getDate()).slice(-2);
  return y + "-" + m + "-" + d + " " + now.toTimeString().substr(0, 8);
}