我还没见过

Math.floor(Date.now() / 1000); // current time in seconds

另一个我还没看到的是

var _ = require('lodash'); // from here https://lodash.com/docs#now
_.now();

更简单的方法：

var timeStamp=event.timestamp || new Date().getTime();

var timestamp = Number(new Date()); // current time as number

var time = Date.now || function() {
  return +new Date;
};

time();

function getTimeStamp() {
    var now = new Date();
    return ((now.getMonth() + 1) + '/' +
            (now.getDate()) + '/' +
             now.getFullYear() + " " +
             now.getHours() + ':' +
             ((now.getMinutes() < 10)
                 ? ("0" + now.getMinutes())
                 : (now.getMinutes())) + ':' +
             ((now.getSeconds() < 10)
                 ? ("0" + now.getSeconds())
                 : (now.getSeconds())));
}

前几天，我从JQueryCookie的源代码中学习了一种将给定的Date对象转换为Unix时间戳的非常酷的方法。

下面是一个示例：

var date = new Date();
var timestamp = +date;