如何检测JavaScript是否被禁用?

今天早上有个帖子问有多少人禁用JavaScript。然后我开始想知道可以使用什么技术来确定用户是否禁用了它。

有人知道一些简单的方法来检测JavaScript是否被禁用吗?我的意图是给一个警告，如果浏览器没有启用JS，站点将无法正常运行。

最终，我想把它们重定向到能够在没有JS的情况下工作的内容，但我需要这个检测作为一个占位符来开始。

当前回答

这是我使用的“最干净”的解决方案:

<noscript>
    <style>
        body *{ /*hides all elements inside the body*/
            display: none;
        }
        h1{ /* even if this h1 is inside head tags it will be first hidden, so we have to display it again after all body elements are hidden*/
            display: block;
        }
    </style>
    <h1>JavaScript is not enabled, please check your browser settings.</h1>
</noscript>

2015-04-02 14:04:23

其他回答

我过去使用的一种技术是使用JavaScript编写一个会话cookie，它只是作为一个标志，表示启用了JavaScript。然后服务器端代码查找此cookie，如果没有找到，则采取适当的操作。当然，这种技术确实依赖于启用cookie !

2008-09-23 14:10:48

Why don't you just put a hijacked onClick() event handler that will fire only when JS is enabled, and use this to append a parameter (js=true) to the clicked/selected URL (you could also detect a drop down list and change the value- of add a hidden form field). So now when the server sees this parameter (js=true) it knows that JS is enabled and then do your fancy logic server-side. The down side to this is that the first time a users comes to your site, bookmark, URL, search engine generated URL- you will need to detect that this is a new user so don't look for the NVP appended into the URL, and the server would have to wait for the next click to determine the user is JS enabled/disabled. Also, another downside is that the URL will end up on the browser URL and if this user then bookmarks this URL it will have the js=true NVP, even if the user does not have JS enabled, though on the next click the server would be wise to knowing whether the user still had JS enabled or not. Sigh.. this is fun...

2009-08-13 21:16:36

当浏览器中没有启用js时，<noscript>标记中的代码将被执行。我们可以使用noscript标签来显示msg来打开JS，如下所示。

<noscript>
    <h1 style="text-align: center;">
       To view this page properly, please 
       enable JavaScript and reload the page
    </h1>
</noscript>

同时保持我们的网站内容在身体隐藏。如下

<body>
<div id="main_body" style="display: none;">
    website content.
</div>
</body>

现在如果JS是打开的，你可以让main_body中的内容可见，如下所示

<script type="text/javascript">
    document.getElementById("main_body").style.display="block";
</script>

2018-06-18 11:12:28

noscript标记工作得很好，但是需要每个额外的页面请求来继续提供无用的JS文件，因为noscript本质上是一个客户端检查。

你可以用JS设置一个cookie，但正如其他人指出的那样，这可能会失败。理想情况下，您希望能够检测到JS客户端，并且不使用cookie，为该用户设置会话服务器端，以指示是否启用JS。

A possibility is to dynamically add a 1x1 image using JavaScript where the src attribute is actually a server side script. All this script does is saves to the current user session that JS is enabled ($_SESSION['js_enabled']). You can then output a 1x1 blank image back to the browser. The script won't run for users who have JS disabled, and hence the $_SESSION['js_enabled'] won't be set. Then for further pages served to this user, you can decide whether to include all of your external JS files, but you'll always want to include the check, since some of your users might be using the NoScript Firefox add-on or have JS disabled temporarily for some other reason.

您可能希望将此检查包含在接近页面末尾的位置，以便额外的HTTP请求不会减慢页面的呈现速度。

2008-09-27 06:53:18

我建议您反过来编写不引人注目的JavaScript。

使您的项目的功能为禁用JavaScript的用户工作，当您完成后，实现您的JavaScript ui增强。

https://en.wikipedia.org/wiki/Unobtrusive_JavaScript

2008-09-23 14:12:54

如何检测JavaScript是否被禁用?

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