1：精确到秒

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
    <head>
        <title>JS获取当前时间戳的方法</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <!-- <link rel="stylesheet" href="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
        <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
        <script src="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> -->     
    </head>
    <body>
    </body>
    <script type="text/javascript">
        var timestamp = Date.parse(new Date());
        console.log(timestamp)
    </script>
</html>

在浏览器打印


 
JS获取当前系统时间戳的方法_javascript
 

2：精确到毫秒

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
    <head>
        <title>JS获取当前时间戳的方法</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <!-- <link rel="stylesheet" href="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
        <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
        <script src="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> -->     
    </head>
    <body>
    </body>
    <script type="text/javascript">
        var timestamp = (new Date()).valueOf();
        console.log(timestamp)
    </script>
</html>
 
JS获取当前系统时间戳的方法_js_02