下面是一个PHP脚本，它可以在生成任何输出之前包含一次。它不是完美的，但在大多数情况下，它工作得足够好，以避免交付客户端不会使用的内容或代码。标题注释解释了它是如何工作的。

<?php
/*****************************************************************************
 * JAVASCRIPT DETECTION                                                      *
 *****************************************************************************/

// Progressive enhancement and graceful degradation are not sufficient if we
// want to avoid sending HTML or JavaScript code that won't be useful on the
// client side.  A normal HTTP request will not include any explicit indicator
// that JavaScript is enabled in the client.  So a "preflight response" is
// needed to prompt the client to provide an indicator in a follow-up request.
// Once the state of JavaScript availability has been received the state of
// data received in the original request must be restored before proceding.
// To the user, this handshake should be as invisible as possible.
// 
// The most convenient place to store the original data is in a PHP session.
// The PHP session extension will try to use a cookie to pass the session ID
// but if cookies are not enabled it will insert it into the query string.
// This violates our preference for invisibility.  When Javascript is not
// enabled the only way to effect a client side redirect is with a "meta"
// element with its "http-equiv" attribute set to "refresh".  In this case
// modifying the URL is the only way to pass the session ID back.
//
// But when cookies are disabled and JavaScript is enabled then a client side
// redirect can be effected by setting the "window.onload" method to a function
// which submits a form.  The form has a "method" attribute of "post" and an
// "action" attribute set to the original URL.  The form contains two hidden
// input elements, one in which the session ID is stored and one in which the
// state of JavaScript availability is stored.  Both values are thereby passed
// back to the server in a POST request while the URL remains unchanged.  The
// follow-up request will be a POST even if the original request was a GET, but
// since the original request data is restored, the containing script ought to
// process the request as though it were a GET.

// In order to ensure that the constant SID is defined as the caller of this
// script would expect, call session_start if it hasn't already been called.
$session = isset($_SESSION);
if (!$session) session_start();

// Use a separate session for Javascript detection.  Save the caller's session
// name and ID.  If this is the followup request then close the caller's
// session and reopen the Javascript detection session.  Otherwise, generate a
// new session ID, close the caller's session and create a new session for
// Javascript detection.
$session_name = session_name();
$session_id = session_id();
session_write_close();
session_name('JS_DETECT');
if (isset($_COOKIE['JS_DETECT'])) {
    session_id($_COOKIE['JS_DETECT']);
} elseif (isset($_REQUEST['JS_DETECT'])) {
    session_id($_REQUEST['JS_DETECT']);
} else {
    session_id(sha1(mt_rand()));
}
session_start();

if (isset($_SESSION['_SERVER'])) {
    // Preflight response already sent.
    // Store the JavaScript availability status in a constant.
    define('JS_ENABLED', 0+$_REQUEST['JS_ENABLED']);
    // Store the cookie availability status in a constant.
    define('COOKIES_ENABLED', isset($_COOKIE['JS_DETECT']));
    // Expire the cookies if they exist.
    setcookie('JS_DETECT', 0, time()-3600);
    setcookie('JS_ENABLED', 0, time()-3600);
    // Restore the original request data.
    $_GET = $_SESSION['_GET'];
    $_POST = $_SESSION['_POST'];
    $_FILES = $_SESSION['_FILES'];
    $_COOKIE = $_SESSION['_COOKIE'];
    $_SERVER = $_SESSION['_SERVER'];
    $_REQUEST = $_SESSION['_REQUEST'];
    // Ensure that uploaded files will be deleted if they are not moved or renamed.
    function unlink_uploaded_files () {
        foreach (array_keys($_FILES) as $k)
            if (file_exists($_FILES[$k]['tmp_name']))
                unlink($_FILES[$k]['tmp_name']);
    }
    register_shutdown_function('unlink_uploaded_files');
    // Reinitialize the superglobal.
    $_SESSION = array();
    // Destroy the Javascript detection session.
    session_destroy();
    // Reopen the caller's session.
    session_name($session_name);
    session_id($session_id);
    if ($session) session_start();
    unset($session, $session_name, $session_id, $tmp_name);
    // Complete the request.
} else {
    // Preflight response not sent so send it.
    // To cover the case where cookies are enabled but JavaScript is disabled,
    // initialize the cookie to indicate that JavaScript is disabled.
    setcookie('JS_ENABLED', 0);
    // Prepare the client side redirect used when JavaScript is disabled.
    $content = '0; url='.$_SERVER['REQUEST_URI'];
    if (!$_GET['JS_DETECT']) {
        $content .= empty($_SERVER['QUERY_STRING']) ? '?' : '&';
        $content .= 'JS_DETECT='.session_id();
    }
    // Remove request data which should only be used here.
    unset($_GET['JS_DETECT'],$_GET['JS_ENABLED'],
            $_POST['JS_DETECT'],$_POST['JS_ENABLED'],
            $_COOKIE['JS_DETECT'],$_COOKIE['JS_ENABLED'],
            $_REQUEST['JS_DETECT'],$_REQUEST['JS_ENABLED']);
    // Save all remaining request data in session data.
    $_SESSION['_GET'] = $_GET;
    $_SESSION['_POST'] = $_POST;
    $_SESSION['_FILES'] = $_FILES;
    $_SESSION['_COOKIE'] = $_COOKIE;
    $_SESSION['_SERVER'] = $_SERVER;
    $_SESSION['_REQUEST'] = $_REQUEST;
    // Rename any uploaded files so they won't be deleted by PHP.  When using
    // a clustered web server, upload_tmp_dir must point to shared storage.
    foreach (array_keys($_FILES) as $k) {
        $tmp_name = $_FILES[$k]['tmp_name'].'x';
        if (move_uploaded_file($_FILES[$k]['tmp_name'], $tmp_name))
            $_SESSION['_FILES'][$k]['tmp_name'] = $tmp_name;
    }
// Have the client inform the server as to the status of Javascript.
?>
<!DOCTYPE html>
<html>
<head>
    <script>
        document.cookie = 'JS_ENABLED=1';
// location.reload causes a confirm box in FireFox
//      if (document.cookie) { location.reload(true); }
        if (document.cookie) { location.href = location; }
    </script>
    <meta http-equiv="refresh" content="<?=$content?>" />
</head>
<body>
    <form id="formid" method="post" action="" >
        <input type="hidden" name="<?=$session_name?>" value="<?=$session_id?>" />
        <input type="hidden" name="JS_DETECT" value="<?=session_id()?>" />
        <input type="hidden" name="JS_ENABLED" value="1" />
    </form>
    <script>
        document.getElementById('formid').submit();
    </script>
</body>
</html>
<?php
    exit;
}
?>

人们已经发布了一些例子，这些例子都是很好的检测选项，但是基于你的要求“给出警告，如果浏览器没有启用JS，站点将无法正常运行”。你可以添加一个元素，让它以某种方式出现在页面上，例如当你获得徽章时，在Stack Overflow上弹出相应的消息，然后用一些Javascript删除它，在页面加载时立即运行(我指的是DOM，而不是整个页面)。

您会想看一下noscript标记。

<script type="text/javascript">
...some javascript script to insert data...
</script>
<noscript>
   <p>Access the <a href="http://someplace.com/data">data.</a></p>
</noscript>

我想添加我的解决方案，以获得可靠的统计数据，有多少真正的用户访问我的网站与javascript禁用的总用户。每节课只检查一次，有以下好处:

访问100个页面或仅访问1个页面的用户每人算1个。这允许只关注单个用户，而不是页面。 不打破页面流，结构或语义在任何方式 可以记录用户代理的日志。这允许排除机器人统计，如谷歌机器人和bing机器人通常有JS禁用!也可以记录IP，时间等… 每个会话只检查一次(最小的过载)

我的代码使用PHP, mysql和jquery与ajax，但可以适应其他语言:

在你的数据库中创建一个像这样的表:

CREATE TABLE IF NOT EXISTS `log_JS` (
  `logJS_id` int(11) NOT NULL AUTO_INCREMENT,
  `data_ins` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `session_id` varchar(50) NOT NULL,
  `JS_ON` tinyint(1) NOT NULL DEFAULT '0',
  `agent` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`logJS_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8;

在使用session_start()或等效(jquery必需)后将此添加到每个页面:

<?  if (!isset($_SESSION["JSTest"]))
    { 
        mysql_query("INSERT INTO log_JS (session_id, agent) VALUES ('" . mysql_real_escape_string(session_id()) . "', '" . mysql_real_escape_string($_SERVER['HTTP_USER_AGENT']). "')"); 
        $_SESSION["JSTest"] = 1; // One time per session
        ?>
        <script type="text/javascript">
            $(document).ready(function() { $.get('JSOK.php'); });
        </script>
        <?
    }
?>

像这样创建页面JSOK.php:

<?
include_once("[DB connection file].php");   
mysql_query("UPDATE log_JS SET JS_ON = 1 WHERE session_id = '" . mysql_real_escape_string(session_id()) . "'");

因为我总是想给浏览器一些有价值的东西，我经常使用这个技巧:

首先，页面中任何需要JavaScript才能正常运行的部分(包括通过getElementById调用等修改的被动HTML元素)都被设计成可用的，假设没有可用的JavaScript。(设计得好像它不存在一样)

任何需要JavaScript的元素，我在标签中放置如下内容:

<span name="jsOnly" style="display: none;"></span>

然后在文档的开头，使用.onload或document。在getElementsByName('jsOnly')的循环中设置.style。Display = "";重新打开JS依赖的元素。这样，非JS的浏览器就不需要看到站点中依赖于JS的部分，如果他们拥有它，它会在准备就绪时立即显示出来。

一旦您习惯了这种方法，就很容易混合您的代码来处理这两种情况，尽管我现在只是在试验noscript标记，并期望它会有一些额外的优点。

当然，cookie和HTTP报头是很好的解决方案，但两者都需要显式的服务器端参与。

对于简单的网站，或者我没有后端访问，我更喜欢客户端解决方案。

--

我使用下面的代码为HTML元素本身设置一个class属性，这样我的CSS就可以处理几乎所有其他显示类型逻辑。

方法:

1)将<script>document.getElementsByTagName('html')[0]. classlist .add('js-enabled');</script>放在<html>元素之上。

警告! ! ! ! 这个方法，将覆盖所有<html>类属性，更不用说可能不是“有效”的html，但在所有浏览器中都可以工作，我已经测试过了。

*注意:由于脚本运行的时间，在<html>标记被处理之前，它最终得到一个没有节点的空classList集合，所以在脚本完成时，<html>元素将只给出您添加的类。

2)保留所有其他<html>类属性，只需将script <script>document.getElementsByTagName('html')[0]. classlist .add('js-enabled');</script>放在<html>标签后面。

在这两种情况下，如果JS被禁用，则不会对<html>类属性进行任何更改。

选择

这些年来，我使用了其他一些方法:

    <script type="text/javascript">
    <!-- 
        (function(d, a, b){ 
            let x = function(){
                // Select and swap
                let hits = d.getElementsByClassName(a);
                for( let i = hits.length - 1; i >= 0; i-- ){
                    hits[i].classList.add(b);
                    hits[i].classList.remove(a);
                }
            };
            // Initialize Second Pass...
            setTimeout(function(){ x(); },0);
            x();
        })(document, 'no-js', 'js-enabled' );
    -->
</script>

//简化为:

<script type="text/javascript">
    <!-- 
        (function(d, a, b, x, hits, i){x=function(){hits=d.getElementsByClassName(a);for(i=hits.length-1;i>=0;i--){hits[i].classList.add(b);hits[i].classList.remove(a);}};setTimeout(function(){ x(); },0);x();})(document, 'no-js', 'js-enabled' );
    -->
</script>

这将在页面中循环两次，一次在页面中它所在的位置，通常在<html>和 再次页面加载后。需要两次，因为我注入了一个头。一个CMS的tpl文件，我没有后端访问，但想为no-js片段提供样式选项。

第一步，将设置.js启用的类，允许任何全局样式生效，并阻止大多数进一步的回流。第二步，是所有后来包含的内容的总称。

推理:

主要原因是，我关心是否启用JS是为了“样式化”的目的，隐藏/显示一个表单，启用/禁用按钮或重新设置滑块、表格和其他需要JS“正确”运行的表示和布局，如果没有JS来动画或处理交互，将是无用或不可用的。

此外，你不能直接用javascript检测，如果javascript被“禁用”…只有当它是“启用”时，通过执行一些javascript，所以你要么依赖<meta http-equiv="refresh" content="2;url=/url/to/no-js/content.html" />，要么你可以依靠CSS来切换样式，如果javascript执行，切换到“启用js”模式。