blocks|key|1062486|text|不，这是不可能的，因为PHP是一种服务器端语言，它不以任何方式或形式访问客户端浏览器(客户端从PHP服务器请求)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1062487|客户端可能会通过HTTP头提供一些元信息，但它们不一定会告诉您用户是否启用了JavaScript，而且您也不能依赖它们。|1062488|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

<p>No, that is not possible, because PHP is a server side language, it does not access the client's browser in any way or form (the client requests from the PHP server).</p>

<p>The client may provide some meta info through HTTP headers, but they don't necessarily tell you whether the user has JavaScript enabled or not and you can't rely on them anyway,</p>


blocks|key|1062700|text|也许是一个更简单的选择。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1062701|<html>
<head>
+<noscript>
+++This+page+needs+JavaScript+activated+to+work.+
+++<style>div+{+display:none;+}</style>
+</noscript>
</head>
<body>
<div>
my+content
</div>
</body>
</html>|code-block|syntax|javascript|1062702|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>perhaps a more simple option...</p>

<pre><code>&lt;html&gt;
&lt;head&gt;
 &lt;noscript&gt;
   This page needs JavaScript activated to work. 
   &lt;style&gt;div { display:none; }&lt;/style&gt;
 &lt;/noscript&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div&gt;
my content
&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>


blocks|key|1062638|text|从技术上讲没有，因为正如其他答案所说，PHP严格地是服务器端的，但你可以这样做……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1062639|在服务器上的PHP页面中，输出(为简洁起见，删除了大量HTML+)|1062640|<html>
+++<head>
++++++<script+type="text/javascript"+src="jquery1.4.4.js"></script>
++++++<script+type="text/javascript">
++++++++$(document).ready(function(){
+++++++++++$.get("myPage.php");
+++++++++});
++++++</script>
+++</head>
+</html>|code-block|syntax|javascript|1062641|然后在myPage.php中设置一个会话变量，以指示客户端支持JS|offset|length|style|CODE|1062642|<?php
+++session_start();
+++$_SESSION['js']+=+true;
?>|1062643|但实际上，只需使用<script></script><noscript></noscript>标记，就可以轻松得多……|1062644|entityMap^0|0|0|0|3|A|0|0|9|12|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|11|8|@$K|12|L|13|M|N]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

<p>Technically no because as the other answers have said, PHP is strictly server-side, but you could do this...</p>

<p>In the PHP page on the server, output (a lot of HTML has been deleted for brevity)</p>

<pre><code>&lt;html&gt;
   &lt;head&gt;
      &lt;script type="text/javascript" src="jquery1.4.4.js"&gt;&lt;/script&gt;
      &lt;script type="text/javascript"&gt;
        $(document).ready(function(){
           $.get("myPage.php");
         });
      &lt;/script&gt;
   &lt;/head&gt;
 &lt;/html&gt;
</code></pre>

<p>Then in <code>myPage.php</code> set a session variable to indicate the client supports JS</p>

<pre><code>&lt;?php
   session_start();
   $_SESSION['js'] = true;
?&gt;
</code></pre>

<p>But really, just use <code>&lt;script&gt;&lt;/script&gt;&lt;noscript&gt;&lt;/noscript&gt;</code> tags, much, much less effort...</p>


blocks|key|1063003|text|//这里有一个解决方案://它完美地工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1063004|<?php

if(!isset($_SESSION['js'])%7C%7C$_SESSION['js']==""){
++echo+"<noscript><meta+http-equiv='refresh'+content='0;url=/get-javascript-status.php&js=0'>+</noscript>";
+++$js+=+true;

+}elseif(isset($_SESSION['js'])&&+$_SESSION['js']=="0"){
+++$js+=+false;
+++$_SESSION['js']="";

+}elseif(isset($_SESSION['js'])&&+$_SESSION['js']=="1"){
+++$js+=+true;
+++$_SESSION['js']="";
}

if+($js)+{
++++echo+'Javascript+is+enabled';
+}+else+{
++++echo+'Javascript+is+disabled';
}

?>|code-block|syntax|javascript|1063005|//然后在get-javascript-status.php中：|1063006|$_SESSION['js']+=+isset($_GET['js'])&&$_GET['js']=="0"+?+"0":"1";
header('location:+/');|1063007|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>//Here is a solution: 
//it works perfect</p>

<pre><code>&lt;?php

if(!isset($_SESSION['js'])||$_SESSION['js']==""){
  echo "&lt;noscript&gt;&lt;meta http-equiv='refresh' content='0;url=/get-javascript-status.php&amp;js=0'&gt; &lt;/noscript&gt;";
   $js = true;

 }elseif(isset($_SESSION['js'])&amp;&amp; $_SESSION['js']=="0"){
   $js = false;
   $_SESSION['js']="";

 }elseif(isset($_SESSION['js'])&amp;&amp; $_SESSION['js']=="1"){
   $js = true;
   $_SESSION['js']="";
}

if ($js) {
    echo 'Javascript is enabled';
 } else {
    echo 'Javascript is disabled';
}

?&gt;
</code></pre>

<p>//And then inside get-javascript-status.php : </p>

<pre><code>$_SESSION['js'] = isset($_GET['js'])&amp;&amp;$_GET['js']=="0" ? "0":"1";
header('location: /');
</code></pre>


blocks|key|848342|text|您无法判断浏览器是否启用了JS，但您可以判断浏览器是否支持JS+http://php.net/manual/en/function.get-browser.php|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|848343|$js_capable+=+get_browser(null,+true)=>javascript+==+1|style|CODE|848344|话虽如此，但这可能没有多大用处。您应该重新考虑从PHP中检测JS。如果您使用progressive+enhancement，应该不需要它，这意味着JS只向页面上已有的内容添加功能。|848345|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.get-browser.php|1|http://en.wikipedia.org/wiki/Progressive_enhancement^0|W|1D|0|0|0|1I|0|12|N|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|D|3|E|5|6|7|X|8|@$A|Y|B|Z|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|J|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]]]

<p>You can't tell if a browser has JS enabled, but you can tell if the browser supports JS <a href="http://php.net/manual/en/function.get-browser.php" rel="nofollow">http://php.net/manual/en/function.get-browser.php</a></p>

<p><code>$js_capable = get_browser(null, true)=&gt;javascript == 1</code></p>

<p>Having said this, that's probably not of much use. You should reconsider detecting JS from PHP. There should be no need for it if you use <a href="http://en.wikipedia.org/wiki/Progressive_enhancement" rel="nofollow" title="Progressive Enhancement">progressive enhancement</a>, meaning that JS only adds functionality to what's already on the page.</p>


blocks|key|849000|text|<noscript>
++++<?php+if(basename($_SERVER['REQUEST_URI'])+!=+"disable.html"){+?>
++++++++<meta+http-equiv="Refresh"+content="0;disable.html">
++++<?php+}+?>
</noscript>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|849001|将头文件中的上述代码放在标题标记之后，并为重定向设置适当的likedisable.html。|unstyled|849002|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>&lt;noscript&gt;
    &lt;?php if(basename($_SERVER['REQUEST_URI']) != "disable.html"){ ?&gt;
        &lt;meta http-equiv="Refresh" content="0;disable.html"&gt;
    &lt;?php } ?&gt;
&lt;/noscript&gt;
</code></pre>

<p>Place above code in your header file after title tag and set appropriate like[disable.html] for redirection.</p>


blocks|key|849135|text|在尝试之前，您必须禁用您的浏览器javascript...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|849136|在那之后|849137|尝试以下代码：|849138|<html>
<head>
<noscript><meta+http-equiv="refresh"content="0;+url=script-disabled.html">
</noscript>
<h1>congrats+!+Your+Browser+Have+Java+Script+Enabled+</h1>
</head>
</html>|code-block|syntax|javascript|849139|在script-disabled.html中编写一些内容|849140|它的工作|849141|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|T|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

<p>before try you have to disable your browsers javascript...</p>

<p>after then</p>

<p>Try This code :</p>

<pre><code>&lt;html&gt;
&lt;head&gt;
&lt;noscript&gt;&lt;meta http-equiv="refresh"content="0; url=script-disabled.html"&gt;
&lt;/noscript&gt;
&lt;h1&gt;congrats ! Your Browser Have Java Script Enabled &lt;/h1&gt;
&lt;/head&gt;
&lt;/html&gt;
</code></pre>

<p>Write something in script-disabled.html</p>

<p>its work</p>


blocks|key|1063094|text|这是我在我的页面上创建的一个小include，用来检测是否启用了js。希望这能帮上忙。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1063095|<?php
//Check+if+we+should+check+for+js
if+((!isset($_GET['jsEnabled'])+%7C%7C+$_GET['jsEnabled']+==+'true')+&&+!isset($_SERVER['HTTP_X_REQUESTED_WITH'])){

+++//Check+to+see+if+we+already+found+js+enabled
+++if+(!isset($_SESSION['javaEnabled'])){
++++++//Check+if+we+were+redirected+by+javascript
++++++if+(isset($_GET['jsEnabled'])){
+++++++++//Check+if+we+have+started+a+session
+++++++++if(session_id()+==+'')+{
++++++++++++session_start();
+++++++++}

+++++++++//Set+session+variable+that+we+have+js+enabled
+++++++++$_SESSION['javaEnabled']+=+true;
++++++}
++++++else{
+++++++++$reqUrl+=+$_SERVER['REQUEST_URI'];
+++++++++$paramConnector+=+(strpos($reqUrl,+"?"))?+"&"+:+"?";

+++++++++echo+"
++++++++++++<script+type='text/javascript'>
+++++++++++++++window.location+=+'"+.+$reqUrl+.+$paramConnector+.+"jsEnabled=true'
++++++++++++</script>
++++++++++++<noscript>
+++++++++++++++
+++++++++++++++<meta+HTTP-EQUIV='REFRESH'+content='0;+"+.+$reqUrl+.+$paramConnector+.+"jsEnabled=false'>
++++++++++++</noscript>
+++++++++";

+++++++++//Break+out+and+try+again+to+check+js
+++++++++exit;
++++++}
+++}
}
?>|code-block|syntax|javascript|1063096|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Here is a small include I made up that I have on top of my pages to detect if js is enabled. Hope this helps out...</p>

<pre><code>&lt;?php
//Check if we should check for js
if ((!isset($_GET['jsEnabled']) || $_GET['jsEnabled'] == 'true') &amp;&amp; !isset($_SERVER['HTTP_X_REQUESTED_WITH'])){

   //Check to see if we already found js enabled
   if (!isset($_SESSION['javaEnabled'])){
      //Check if we were redirected by javascript
      if (isset($_GET['jsEnabled'])){
         //Check if we have started a session
         if(session_id() == '') {
            session_start();
         }

         //Set session variable that we have js enabled
         $_SESSION['javaEnabled'] = true;
      }
      else{
         $reqUrl = $_SERVER['REQUEST_URI'];
         $paramConnector = (strpos($reqUrl, "?"))? "&amp;" : "?";

         echo "
            &lt;script type='text/javascript'&gt;
               window.location = '" . $reqUrl . $paramConnector . "jsEnabled=true'
            &lt;/script&gt;
            &lt;noscript&gt;
               &lt;!-- Redirect to page and tell us that JS is not enabled --&gt;
               &lt;meta HTTP-EQUIV='REFRESH' content='0; " . $reqUrl . $paramConnector . "jsEnabled=false'&gt;
            &lt;/noscript&gt;
         ";

         //Break out and try again to check js
         exit;
      }
   }
}
?&gt;
</code></pre>


blocks|key|849105|text|<html>
<head>
<?php
++if(!isset($_REQUEST['JS'])){?>
++++<noscript>
++++++<meta+http-equiv="refresh"+content="0;+url='<?php+echo+basename($_SERVER['PHP_SELF']);?>?JS='"/>
++++</noscript><?php
++}
?>
</head>
<body>++++
<?php
++if(isset($_REQUEST['JS']))+echo+'JavaScript+is+Disabled';
++else+echo+'JavaScript+is+Enabled';
?>
</body>
</html>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|849106|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;html&gt;
&lt;head&gt;
&lt;?php
  if(!isset($_REQUEST['JS'])){?&gt;
    &lt;noscript&gt;
      &lt;meta http-equiv="refresh" content="0; url='&lt;?php echo basename($_SERVER['PHP_SELF']);?&gt;?JS='"/&gt;
    &lt;/noscript&gt;&lt;?php
  }
?&gt;
&lt;/head&gt;
&lt;body&gt;    
&lt;?php
  if(isset($_REQUEST['JS'])) echo 'JavaScript is Disabled';
  else echo 'JavaScript is Enabled';
?&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>


blocks|key|848168|text|PHP不能用来检测javascript是否被启用。取而代之的是使用<noscript>来显示替代消息/执行某些操作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|848169|entityMap^0|X|A|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

<p>PHP can't be used to detect whether javascript is enabled or not. Instead use <code>&lt;noscript&gt;</code> to display an alternate message / do something.</p>


blocks|key|1063448|text|要在禁用JS的情况下清除机器人：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1063449|<?php
session_start();
@$_SESSION['pagecount']%2B%2B;
?>

<html>
<head>

<?php+
if+(!isset($_COOKIE['JSEnabled'])+%7C%7C+strlen($_COOKIE['JSEnabled'])!=32+)+{
++$js_cookie=md5(md5(@$_SESSION['pagecount'])+.+$_SERVER['REMOTE_ADDR']);
++echo+'<script+language="javascript">';
++echo+'document.cookie="JSEnabled='+.+$js_cookie+.+'"';
++echo+'</script>';
++echo+'<meta+http-equiv="refresh"+content="0;url=http://example.com"/>';
}
?>

<?php+
+$js=$_COOKIE['JSEnabled'];
+if+($js!=md5(md5(@$_SESSION['pagecount']-1)+.+$_SERVER['REMOTE_ADDR']))+{
+$js_cookie=md5(md5(@$_SESSION['pagecount'])+.+$_SERVER['REMOTE_ADDR']);
++echo+'<script+language="javascript">';
++echo+'document.cookie="JSEnabled='+.+$js_cookie+.+'"';
++echo+'</script>';
+++++echo+"</head><body>Sorry,+this+website+needs+javascript+and+cookies+enabled.</body></html>";
+++++die();
+}+else+{
++$js_cookie=md5(md5(@$_SESSION['pagecount'])+.+$_SERVER['REMOTE_ADDR']);
++echo+'<script+language="javascript">';
++echo+'document.cookie="JSEnabled='+.+$js_cookie+.+'"';
++echo+'</script>';++++

+}

?>|code-block|syntax|javascript|1063450|例如，没有人可以使用curl+-H+"Cookie:+JSEnabled=XXXXXXXXXXXXXXXXXX“，因为他们不知道计算散列的算法。|1063451|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>To get rid of bots with JS disabled:</p>

<pre><code>&lt;?php
session_start();
@$_SESSION['pagecount']++;
?&gt;

&lt;html&gt;
&lt;head&gt;

&lt;?php 
if (!isset($_COOKIE['JSEnabled']) || strlen($_COOKIE['JSEnabled'])!=32 ) {
  $js_cookie=md5(md5(@$_SESSION['pagecount']) . $_SERVER['REMOTE_ADDR']);
  echo '&lt;script language="javascript"&gt;';
  echo 'document.cookie="JSEnabled=' . $js_cookie . '"';
  echo '&lt;/script&gt;';
  echo '&lt;meta http-equiv="refresh" content="0;url=http://example.com"/&gt;';
}
?&gt;

&lt;?php 
 $js=$_COOKIE['JSEnabled'];
 if ($js!=md5(md5(@$_SESSION['pagecount']-1) . $_SERVER['REMOTE_ADDR'])) {
 $js_cookie=md5(md5(@$_SESSION['pagecount']) . $_SERVER['REMOTE_ADDR']);
  echo '&lt;script language="javascript"&gt;';
  echo 'document.cookie="JSEnabled=' . $js_cookie . '"';
  echo '&lt;/script&gt;';
     echo "&lt;/head&gt;&lt;body&gt;Sorry, this website needs javascript and cookies enabled.&lt;/body&gt;&lt;/html&gt;";
     die();
 } else {
  $js_cookie=md5(md5(@$_SESSION['pagecount']) . $_SERVER['REMOTE_ADDR']);
  echo '&lt;script language="javascript"&gt;';
  echo 'document.cookie="JSEnabled=' . $js_cookie . '"';
  echo '&lt;/script&gt;';    

 }

?&gt;
</code></pre>

<p>No one can use for example curl -H "Cookie: JSEnabled=XXXXXXXXXXXXXXXXXX"
because they don't know your algo of computing the hash.</p>


blocks|key|848497|text|这是我检查javascript和cookies是否已启用http://asdlog.com/Check_if_cookies_and_javascript_are_enabled的方式|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|848498|我将其复制/粘贴到此处|848499|<?
if($_SESSION['JSexe']){+++++//3rd+check+js
++++if($_COOKIE['JS'])++setcookie('JS','JS',time()-1);//check+on+every+page+load
++++else++++++++++++header('Location:+js.html');
}+++++++++++++++//2nd+so+far+it's+been+server-side+scripting.+Client-side+scripting+must+be+executed+once+to+set+second+cookie.
++++++++++++++++//Without+JSexe,+user+with+cookies+and+js+enabled+would+be+sent+to+js.html+the+first+page+load.
elseif($_COOKIE['PHP'])+++++$_SESSION['JSexe']+=+true;
else{+++++++++++++++//1st+check+cookies
++++if($_GET['cookie'])+header('Location:+cookies.html');
++++else{
++++++++++++++++setcookie('PHP','PHP');
++++++++++++++++header('Location:+'.$_SERVER['REQUEST_URI'].'?cookie=1');
++++}
}
?>
<head>
<script+type="text/javascript">document.cookie+=+'JS=JS'</script>
</head>|code-block|syntax|javascript|848500|entityMap|0|LINK|mutability|MUTABLE|url|http://asdlog.com/Check_if_cookies_and_javascript_are_enabled^0|S|1P|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<p>This is the way I check whether javascript and cookies are enabled or not <a href="http://asdlog.com/Check_if_cookies_and_javascript_are_enabled" rel="nofollow">http://asdlog.com/Check_if_cookies_and_javascript_are_enabled</a></p>

<p>I copy/paste it here</p>

<pre><code>&lt;?
if($_SESSION['JSexe']){     //3rd check js
    if($_COOKIE['JS'])  setcookie('JS','JS',time()-1);//check on every page load
    else            header('Location: js.html');
}               //2nd so far it's been server-side scripting. Client-side scripting must be executed once to set second cookie.
                //Without JSexe, user with cookies and js enabled would be sent to js.html the first page load.
elseif($_COOKIE['PHP'])     $_SESSION['JSexe'] = true;
else{               //1st check cookies
    if($_GET['cookie']) header('Location: cookies.html');
    else{
                setcookie('PHP','PHP');
                header('Location: '.$_SERVER['REQUEST_URI'].'?cookie=1');
    }
}
?&gt;
&lt;head&gt;
&lt;script type="text/javascript"&gt;document.cookie = 'JS=JS'&lt;/script&gt;
&lt;/head&gt;
</code></pre>


blocks|key|848546|text|最近，我遇到了以下难题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|848547|我使用一个PHP函数来生成与当前URL相关的QR图像，这对于移动设备非常有用。该功能运行良好，但将我的网站放在共享主机上，对CPU和RAM的使用有一些限制。这个函数太重了，而且它消耗了大量的CPU时间和RAM，所以主办方要求我减少使用量。|848548|经过几次尝试，我终于有了一个想法，我可以从搜索引擎机器人中节省一些CPU和RAM的使用量。很难通过浏览器识别来识别机器人，但所有的机器人都没有启用JS，这是我用来检测它是真正的浏览器还是机器人的主要标准。为了解释防止执行不会给搜索引擎带来更多东西的代码有多重要(在我的情况下，QR不影响搜索引擎)，我可以说，仅谷歌机器人每天就在我的网站上进行大约16000次爬行。|848549|所以我做了一件非常简单的事情，这对我很有帮助：|848550|<script+language="javascript"></script>|code-block|syntax|javascript|848551|此代码使用JS编写一行PHP代码，因此只有在启用了JS时才会编写此行。|848552|当然，如果你想在JS被禁用时显示一些东西，你可以使用'noscript‘标签，但是这个方法展示了如何在JS被启用时才执行一些PHP。|848553|希望这能有所帮助。|848554|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

<p>Recently, I had the following dilemma:</p>

<p>I use a PHP function that generates a QR image related to the current URL, which is very useful for mobile devices. The function works fine, but having my site on a shared hosting, there are some limits for CPU and RAM usage. This function is to heavy and it consumes a lot of CPU time and RAM, so the hosting guys asked me to decrease the usage.</p>

<p>After some tries, I finally reached the idea that I can save some CPU &amp; RAM usage from search engine bots. It is difficult to recognize a bot by browser identification, but all the bots have no JS enabled and that's the main criteria I used to detect if it is a real browser or it is a bot. To explain how significant it is to prevent executing code which will not give anything more for Search Engines (QR, in my case, does not affect search engines), I can say that just Google bot for example makes about 16000 crawls a day on my site.</p>

<p>So I've made this very simple thing which helped a lot:</p>

<pre><code>&lt;script language="javascript"&gt;&lt;!--
document.write('&lt;?php echo drawQR($_SERVER["REQUEST_URI"]);?&gt;');
//--&gt;&lt;/script&gt;
</code></pre>

<p>This code uses JS to write a line of PHP code, so this line will be written only when JS is enabled. </p>

<p>Of couse you can use 'noscript' tag if you want to show something when JS is disabled, but this method shows how to execute some PHP only when JS is enabled.</p>

<p>Hope this helps.</p>


blocks|key|1063401|text|使用JavaScript创建cookie，并使用PHP读取它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1063402|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

<p>Create a cookie using JavaScript and read it using PHP.</p>


blocks|key|848235|text|让您的php主页假定jscript已关闭，并在<head>中添加一个<script>以重定向到支持jscript的应用程序。如果用户实际使用的是您的第一个页面，则假定jscript已关闭。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|848236|entityMap^0|N|6|Y|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

<p>Make your main php page assume jscript is off, and add a <code>&lt;script&gt;</code> to redirect to the jscript-enabled app in the <code>&lt;head&gt;</code>. If the user actually uses your first page, assume jscript is off.</p>


blocks|key|848423|text|其他选择:如果你不需要在访问者的第一个视图(主页)检查是否启用了js，你可以用JS设置一个cookie。在下一页，你可以用php检查cookie是否在那里……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|848424|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

<p>Other option:
If you dont' have to check if JS is enabled at the visitors first view (mainpage) you can set a cookie with js. On the next page you can check with php if the cookie is there...</p>


blocks|key|1062779|text|你可以使用逻辑逻辑(default/switch)+-这是我在php中打印变量的例子：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1062780|PHP：|1062781|$js+=+'No';
print+'Javascript+Enabled:+&lt;span+id="jsEnabled"&gt;'.$js.'&lt;/span&gt;';|code-block|syntax|javascript|1062782|JS：(在我的文档中准备好)|1062783|jQuery('#jsEnabled').text('Yes');+or+$('#jsEnabled').text('Yes');|1062784|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

<p>You can use logic the logic (default/switch) - is this example I printed the variable in php:</p>

<p>PHP:</p>

<pre><code>$js = 'No';
print 'Javascript Enabled: &amp;lt;span id="jsEnabled"&amp;gt;'.$js.'&amp;lt;/span&amp;gt;';
</code></pre>

<p>JS: (in my document ready)</p>

<pre><code>jQuery('#jsEnabled').text('Yes'); or $('#jsEnabled').text('Yes');
</code></pre>


blocks|key|848623|text|您可以使用Javascript设置cookie，然后使用Javascript重新加载页面。然后使用PHP检查cookie是否已设置，如果是Javascript已启用！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|848624|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

<p>You can set a cookie using Javascript and then reload the page using Javascript. Then using PHP you shall check if the cookie is setted, if it is Javascript is enabled!</p>


blocks|key|848824|text|它是2013年。只需让脚本在body+>+noscript标记中呈现非js模板，然后在CSS中保留主js站点容器div+display:+none；然后在关闭主#container+div之后和noscript标记之前立即放入类似<script>$('#container').show();</script>的内容。(当然，如果您使用的是jquery+)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|848825|这样做将自动显示未启用js的浏览器的HTML，然后启用js的浏览器将只看到js站点。|848826|如果你担心过多的标记会使页面变得过大，那么你也可以做同样的事情，但是把<div+id="content"></div>留空，然后使用js代码，而不是仅仅显示div，使用ajax调用来获取它的内容。|848827|顺便说一句，我可能会在noscript标签中包含非js站点的额外css文件，以节省带宽。|848828|entityMap^0|E|F|37|14|0|0|Z|O|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|W|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|M|$]]

<p>Its 2013. Simply have your script render the non-js templates inside a <code>body &gt; noscript</code> tag, then inside your CSS keep your main js site container div display: none; After that just put something like <code>&lt;script&gt;$('#container').show();&lt;/script&gt;</code> immediately after you close you main #container div and before your noscript tag. (if you're using jquery of course).</p>

<p>Doing it this way will show the HTML for the non-js enabled browsers automatically, and then the js enabled browsers will only see the js site.</p>

<p>If you're worried about over-bloating the page size with too much mark up, then you could do the same but instead leave <code>&lt;div id="content"&gt;&lt;/div&gt;</code> empty, then with the js code instead of just showing the div use an ajax call to fetch the content for it.</p>

<p>On a  side note, I would probably include additional css files for the non-js site within the noscript tag to save on bandwidth. </p>


blocks|key|848953|text|因为PHP是服务器端的，所以在PHP中，您无法知道客户端是否启用了Javascript，除非您使用会话(或其他跨请求存储数据的方式)，并首先发送一些客户端响应的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|848954|如果您将以下内容放在PHP文件的开头，则客户端重定向到相同的URL，并在查询字符串后附加'js=0‘或'js=1’，这取决于它们是否启用了Javascript。在接收到重定向请求时，脚本将结果记录在会话变量中，然后重定向回原始URL，即没有附加的'js=0‘或’js=1‘。收到第二个重定向后，脚本照常进行，现在使用根据客户端Javascript功能设置的会话变量。|848955|如果您不关心查询字符串在用户地址栏中的外观，那么可以跳过第二个重定向，只需设置会话变量即可。当这些重定向正在发生时，用户会看到一条简短的信息性消息(如果你不关心这一点，也可以跳过)。|848956|<?php
session_start();
if+(!isset($_SESSION['js'])+&&+!isset($_GET['js']))+{
++++$url=$_SERVER['SCRIPT_URI'];
++++$qry='?'.($q=$_SERVER['QUERY_STRING']).($q?'&':'').'js';
++++die('<!DOCTYPE+html><html+lang="en"><head><meta+charset="utf-8"+/><title>js+check</title>'.
++++++++'<script+type="text/javascript">window.location.href="'.$url.$qry.'=1";</script>'.
++++++++'<noscript><meta+http-equiv="refresh"+content="0;+url='.$url.$qry.'=0"+/></noscript>'.
++++++++'</head><body>Hold+on+while+we+check+whether+you+have+Javascript+enabled.</body></html>');
}+elseif+(isset($_GET['js']))+{
++++$_SESSION['js']=$_GET['js'];
++++$qry+=+preg_replace('%25&?js=(0%7C1)$%25',+'',+$_SERVER['QUERY_STRING']);
++++$url+=+$_SERVER['SCRIPT_URI'].($qry?'?':'').$qry;
++++die('<!DOCTYPE+html><html+lang="en"><head><meta+charset="utf-8"+/><title>js+check</title>'.
++++++++'<meta+http-equiv="refresh"+content="0;+url='.$url.$qry.'"+/>'.
++++++++'</head><body>Hold+on+while+we+check+whether+you+have+Javascript+enabled.</body></html>');
}

if+($_SESSION['js'])+{
++++//Javascript+is+enabled
}+else+{
++++//Javascript+is+disabled
}
?>|code-block|syntax|javascript|848957|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>Since PHP is server side you can't know in PHP whether the client has Javascript enabled unless you use sessions (or some other way to store data across requests) and first send some code to which the client responds.</p>

<p>If you put the following at the start of your PHP file the client is redirected to the same URL with either 'js=0' or 'js=1' appended to the query string, depending on whether they have Javascript enabled or not. Upon receiving the redirected request the script records the result in a session variable and then redirects back to the original URL, i.e. without the appended 'js=0' or 'js=1'.Upon receiving this second redirect the script proceeds as normal, now with the session variable set according to the clients Javascript capability.</p>

<p>If you don't care about how your query string looks in the user's address bar you can skip the second redirect and just set the session variable. While these redirects are taking place the user is shown a short informative message (also something you could skip if you don't care about that).</p>

<pre><code>&lt;?php
session_start();
if (!isset($_SESSION['js']) &amp;&amp; !isset($_GET['js'])) {
    $url=$_SERVER['SCRIPT_URI'];
    $qry='?'.($q=$_SERVER['QUERY_STRING']).($q?'&amp;':'').'js';
    die('&lt;!DOCTYPE html&gt;&lt;html lang="en"&gt;&lt;head&gt;&lt;meta charset="utf-8" /&gt;&lt;title&gt;js check&lt;/title&gt;'.
        '&lt;script type="text/javascript"&gt;window.location.href="'.$url.$qry.'=1";&lt;/script&gt;'.
        '&lt;noscript&gt;&lt;meta http-equiv="refresh" content="0; url='.$url.$qry.'=0" /&gt;&lt;/noscript&gt;'.
        '&lt;/head&gt;&lt;body&gt;Hold on while we check whether you have Javascript enabled.&lt;/body&gt;&lt;/html&gt;');
} elseif (isset($_GET['js'])) {
    $_SESSION['js']=$_GET['js'];
    $qry = preg_replace('%&amp;?js=(0|1)$%', '', $_SERVER['QUERY_STRING']);
    $url = $_SERVER['SCRIPT_URI'].($qry?'?':'').$qry;
    die('&lt;!DOCTYPE html&gt;&lt;html lang="en"&gt;&lt;head&gt;&lt;meta charset="utf-8" /&gt;&lt;title&gt;js check&lt;/title&gt;'.
        '&lt;meta http-equiv="refresh" content="0; url='.$url.$qry.'" /&gt;'.
        '&lt;/head&gt;&lt;body&gt;Hold on while we check whether you have Javascript enabled.&lt;/body&gt;&lt;/html&gt;');
}

if ($_SESSION['js']) {
    //Javascript is enabled
} else {
    //Javascript is disabled
}
?&gt;
</code></pre>


blocks|key|849165|text|如果检查页面首次加载的时间，则可以在禁用javascript的情况下运行php：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|849166|<noscript>
++<?php
++++//your+php+code+here
++?>
</noscript>|code-block|syntax|javascript|849167|示例：|849168|<noscript>
++<?php
++++die('please+enable+JavaScript+to+view+this+page');
++?>
</noscript>|849169|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>if checking when the page first loads, this can run php if javascript is disabled:</p>
<pre><code>&lt;noscript&gt;
  &lt;?php
    //your php code here
  ?&gt;
&lt;/noscript&gt;
</code></pre>
<p>Example:</p>
<pre><code>&lt;noscript&gt;
  &lt;?php
    die('please enable JavaScript to view this page');
  ?&gt;
&lt;/noscript&gt;
</code></pre>


blocks|key|1062936|text|是。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1062937|确保您拥有最新的jQuery.js|offset|length|style|CODE|1062938|//javascript
$(function(){
$('#jsEnabled2').html('Yes+it+is')
})+

//php
$js+-+'No';
$jscheck+=+'Javascript+Enabled:+';
$jscheck+.=+'<span+id="jsEnabled">'.$js.'</span>';
print+$jscheck;|code-block|syntax|javascript|1062939|entityMap^0|0|8|9|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

<p>Yes.</p>

<p>Ensure you have the latest <code>jQuery.js</code></p>

<pre><code>//javascript
$(function(){
$('#jsEnabled2').html('Yes it is')
}) 

//php
$js - 'No';
$jscheck = 'Javascript Enabled: ';
$jscheck .= '&lt;span id="jsEnabled"&gt;'.$js.'&lt;/span&gt;';
print $jscheck;
</code></pre>


<p>Is there a way to check if JavaScript is enabled with PHP? If so, how?</p>


Check if JavaScript is enabled with PHP

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有没有办法检查JavaScript是否启用了PHP？如果是这样的话，是怎么做的？

问检查JavaScript是否启用了PHP
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