您如何获得JavaScript时间戳？

more simpler way:

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

For lodash and underscore users, use _.now.

var timestamp = _.now(); // in milliseconds

Moment.js can abstract away a lot of the pain in dealing with Javascript Dates.

See: http://momentjs.com/docs/#/displaying/unix-timestamp/

moment().unix();

If it is for logging purposes, you can use ISOString

new Date().toISOString()

"2019-05-18T20:02:36.694Z"

If want a basic way to generate a timestamp in Node.js this works well.

var time = process.hrtime();
var timestamp = Math.round( time[ 0 ] * 1e3 + time[ 1 ] / 1e6 );

Our team is using this to bust cache in a localhost environment. The output is /dist/css/global.css?v=245521377 where 245521377 is the timestamp generated by hrtime().

Hopefully this helps, the methods above can work as well but I found this to be the simplest approach for our needs in Node.js.

This one has a solution : which converts unixtime stamp to tim in js try this

var a = new Date(UNIX_timestamp*1000);
var hour = a.getUTCHours();
var min = a.getUTCMinutes();
var sec = a.getUTCSeconds();

Any browsers not supported Date.now, you can use this for get current date time:

currentTime = Date.now() || +new Date()

You can only use

    var timestamp = new Date().getTime();
    console.log(timestamp);

to get the current timestamp. No need to do anything extra.

Today - 2018.06.27 I provide some time comparison for pure js solutions. This can be useful for people who wanna get/measure time in JS in light/efficient way (eg. for real-time applications like simulations, games etc.)

Tested on MacOs High Sierra 10.13.3 on Chrome 67.0.3396.99 (64-bit), Safari 11.0.3 (13604.5.6), Firefox 59.0.2 (64-bit). On below screenshot I show you results for fastest browser (Safari):

As I observe the Date.now() was fastest method to get timestamp for all three browsers. Safari has 19.2M operations per second, Firefox 16.1M, Chrome 7.8M.

The new Date()*1 was slowest for Chrome (2.8M) and Firefox (2.6M). The Number(new Date()) was slowest for Safari (2.9M).

So the winner JS code is Date.now() and fastest browser is Safari (2x faster that chrome! ).

You can perform test on your machine here: https://jsperf.com/timestamp-test-x.

The Date.getTime() method can be used with a little tweak:

The value returned by the getTime method is the number of milliseconds since 1 January 1970 00:00:00 UTC.

Divide the result by 1000 to get the Unix timestamp, floor if necessary:

(new Date).getTime() / 1000

^{The Date.valueOf() method is functionally equivalent to Date.getTime(), which makes it possible to use arithmetic operators on date object to achieve identical results. In my opinion, this approach affects readability.}

In addition to the other options, if you want a dateformat ISO, you get can get it directly

console.log(new Date().toISOString());

jQuery provides its own method to get the timestamp:

var timestamp = $.now();

^{(besides it just implements (new Date).getTime() expression)}

REF: http://api.jquery.com/jQuery.now/

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

time();

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

JavaScript自时期起以毫秒为单位运行，而大多数其他语言以秒为单位运行。您可以以毫秒为单位工作，但是只要您传递一个值来表示PHP，PHP本机功能就可能会失败。因此，请确保我始终使用秒，而不是毫秒。

这将为您提供Unix时间戳（以秒为单位）：

var unix = Math.round(+new Date()/1000);

这将为您提供自纪元以来的毫秒数（不是Unix时间戳）：

var milliseconds = new Date().getTime();

我喜欢这个，因为它很小：

+new Date

我也喜欢这样，因为它很短，并且与现代浏览器兼容，并且有500多人投票认为它更好：

Date.now()