blocks|key|1575525|text|AFAIK，这是不可能的但是如果你对火狐中的扩展如何与错误控制台交互感兴趣，check+this+out。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1575526|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en/Components.utils.reportError^0|12|E|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

AFAIK, it is not possible. But if you are interested in how extensions in Firefox interact with the error console, <a href="https://developer.mozilla.org/en/Components.utils.reportError" rel="nofollow noreferrer">check this out</a>.

blocks|key|1575591|text|我只需要安装Firebug并使用console.log即可。但是，如果你不能做到这一点，你可以抛出一个错误：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1575592|throw+"foobar";
throw+new+Error("bazquux");|code-block|syntax|javascript|1575593|当然，这将使您脱离当前正在执行的代码，因此您不能使用它来进行详细的日志记录，但如果您可以解决这个问题，我认为这是使某些内容开箱即用的唯一方法。|1575594|entityMap^0|G|B|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

I would just install Firebug and use <code>console.log</code>. If you can't do that, though, you can always throw an error:

<pre><code>throw "foobar";
throw new Error("bazquux");
</code></pre>

Of course, this will break you out of the code that you're currently executing, so you can't use it for detailed logging, but if you can work around that I think it's the only way to get something logged out of the box.

blocks|key|1575646|text|您不能直接从不受信任的JavaScript写入控制台(例如，来自页面的脚本)。然而，即使安装Firebug对你没有吸引力，我也建议你试试Firebug+Lite，它不需要在浏览器中安装(实际上，它甚至也不需要Firefox)。它是一个脚本，你可以将它包含在任何网页中(甚至是动态的)，它将为你提供一些基本的Firebug功能(比如console.log())。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1575647|entityMap|0|LINK|mutability|MUTABLE|url|http://getfirebug.com/lite.html^0|4L|D|1W|C|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

You cannot write to the console directly from untrusted JavaScript (e.g. scripts coming from a page). However, even if installing Firebug does not appeal to you, I'd recommend checking out <a href="http://getfirebug.com/lite.html" rel="noreferrer">Firebug Lite</a>, which requires no installation into the browser (nor, in fact, does it even require Firefox). It's a script which you can include into any web page (even dynamically), which will give you some basic Firebug functionality (such as <code>console.log()</code>).

blocks|key|1360490|text|如果您定义了一个全局函数来检查window.console的存在，那么您可以使用Firebug进行跟踪，并且仍然可以很好地与其他浏览器配合使用，并且/或者如果您关闭了Firebug的控制台跟踪：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1360491|debug+=+function+(log_txt)+{
++++if+(typeof+window.console+!=+'undefined')+{
++++++++console.log(log_txt);
++++}
}

debug("foo!");|code-block|syntax|javascript|1360492|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|$]]

If you define a global function that checks for the existence of window.console, you can use Firebug for tracing and still plays nice with other browsers and/or if you turn Firebug's console tracing off:

<pre><code>debug = function (log_txt) {
 if (typeof window.console != 'undefined') {
 console.log(log_txt);
 }
}

debug("foo!");
</code></pre>

blocks|key|1575762|text|这个函数不需要任何扩展，也不需要库。但是，它会将所有权限授予相关网站。不用担心，因为你是开发它的人，对吧？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1575763|//+Define+mylog()+function+to+log+to+Firefox'+error+console+if+such+a
//+thing+exists
function+defineMyLog()
{
++++//+Provide+a+useless+but+harmless+fallback
++++mylog+=+function(msg)+{+};
++++//+return;+//+disable+in+production

++++if+(typeof(netscape)+===+"undefined")+{
++++++++//+alert("Logging+implemented+only+for+Firefox");
++++++++return;
++++}
++++//+The+initial+auth+popup+can+be+avoided+by+pre-setting+some+magic+user_pref
++++//++(+"capability.principal.codebase.p0.granted",+"UniversalXPConnect"),+etc.
++++try+{
++++++++netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
++++}+catch+(e)+{+//+User+has+denied+privileges
++++++++//+alert(e.name+%2B+":+"+%2B+e.message);
++++++++return;
++++}
++++ffconsoleService+=+Components.classes["@mozilla.org/consoleservice;1"]
+++++++++++++++++++++++++++++++++.getService(Components.interfaces.nsIConsoleService);
++++mylog+=+function+(msg)
++++{
++++++++netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
++++++++ffconsoleService.logStringMessage(new+Date().toLocaleTimeString()+%2B+":+"+%2B+msg);
++++}
++++mylog("Firefox+logging+function+has+been+defined");

++++//+window.open("javascript:");+//+this+URL+does+not+work+anymore?
}|code-block|syntax|javascript|1575764|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|$]]

This function does not require any extension nor library. However it grants full privileges to the relevant website. No worries since you are the one developing it, right?

<pre><code>
// Define mylog() function to log to Firefox' error console if such a
// thing exists
function defineMyLog()
{
 // Provide a useless but harmless fallback
 mylog = function(msg) { };
 // return; // disable in production

 if (typeof(netscape) === "undefined") {
 // alert("Logging implemented only for Firefox");
 return;
 }
 // The initial auth popup can be avoided by pre-setting some magic user_pref
 // ( "capability.principal.codebase.p0.granted", "UniversalXPConnect"), etc.
 try {
 netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
 } catch (e) { // User has denied privileges
 // alert(e.name + ": " + e.message);
 return;
 }
 ffconsoleService = Components.classes["@mozilla.org/consoleservice;1"]
 .getService(Components.interfaces.nsIConsoleService);
 mylog = function (msg)
 {
 netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
 ffconsoleService.logStringMessage(new Date().toLocaleTimeString() + ": " + msg);
 }
 mylog("Firefox logging function has been defined");

 // window.open("javascript:"); // this URL does not work anymore?
}
</code></pre>

blocks|key|1360616|text|window.console在Firefox4Beta6中没有定义，即使Firebug1.6X.0b1被启用和打开，可能是因为其他人讨论的特权问题。然而，Firefox4有一个新的工具>+Web控制台，如果这个控制台是打开的，那么页面上有一个window.console对象和不可信的JavaScript代码可以使用console.log()。网络控制台正在变化(请参阅https://wiki.mozilla.org/Firefox/Projects/Console)，您可能需要更改名为devtools.*的设置。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1360617|entityMap|0|LINK|mutability|MUTABLE|url|https://wiki.mozilla.org/Firefox/Projects/Console^0|55|1D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

window.console is undefined in Firefox 4 beta 6 even if Firebug 1.6X.0b1 is enabled and open, probably because of privilege issues that others discuss. However, Firefox 4 has a new Tools > Web Console, and if this is open you have a window.console object and untrusted JavaScript code on the page can use console.log(). The Web Console is in flux (see <a href="https://wiki.mozilla.org/Firefox/Projects/Console" rel="noreferrer">https://wiki.mozilla.org/Firefox/Projects/Console</a>), you may need to change settings named devtools.* in about:config , YMMV.

blocks|key|1575926|text|我今天遇到了一个问题，注意到Firebug中的控制台有不同的标签，而我的标签在净化信息中，你必须选择ALL选项才能看到console.log工作，而不会出现拖拽错误！像这样简单！;%5E)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1575927|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|$]]

I had an issue today, and notice that the Console in Firebug has different tabs, and mine was in Depuration Information, and you must select the ALL option in order to see console.log work without trowing errors! Simple like this! ;^)

Is it possible to add messages to the built-in error console of Firefox from JavaScript code running in web pages?

I know that I there's Firebug, which provides a <code>console</code> object and its own error console, but I was looking for a quick fix earlier on and couldn't find anything.

I guess it might not be possible at all, to prevent malicious web pages from spamming the log?

Log to Firefox Error Console from JavaScript

可以从网页中运行的JavaScript代码向火狐的内置错误控制台添加消息吗？我知道有Firebug，它提供了一个console对象和自己的错误控制台，但我之前一直在寻找快速修复方法，但什么也找不到。我猜这可能根本不可能，以防止恶意网页垃圾日志？

问从JavaScript记录到Firefox错误控制台
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