JavaScript：Ci 未定义

发布于 2024-07-08 03:59:56 字数 596 浏览 7 评论 0原文

我刚刚花了半个小时来找出导致我的 JavaScript 代码中出现错误消息“Ci 未定义”的原因。我终于找到了原因：

它应该是（jQuery）：

$("asd").bla();

它是：（

("asd").bla();

美元符号消失了）

现在解决了问题后，我想了解消息本身：当Firefox告诉我“Ci”时，它是什么意思没有定义。什么是“慈”？

更新：我正在使用当前版本的 Firefox (3.0.3)。

要重现，只需使用以下 HTML 代码：

<html><head><title>test</title>
<script>
("asd").bla();
</script>
</head><body></body></html>

为了明确起见：我知道是什么导致了错误消息。我只是想知道 Firefox 试图通过“Ci”告诉我什么......

原文

I just spent half an one our to find out what caused the Error-Message "Ci is not defined" in my JavaScript code. I finally found the reason:

It should be (jQuery):

$("asd").bla();

It was:

("asd").bla();

(Dollar sign gone missing)

Now after having fixed the problem I'd like to understand the message itself: What does Firefox mean when it tells me that "Ci" is not defined. What's "Ci"?

Update:
I'm using the current version of Firefox (3.0.3).

To reproduce, just use this HTML code:

<html><head><title>test</title>
<script>
("asd").bla();
</script>
</head><body></body></html>

To make it clear: I know what caused the error message. I'd just like to know what Firefox tries to tell me with "Ci"...

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神仙妹妹 2024-07-15 03:59:56

我不知道您使用的是哪个版本的 FF，但无论如何，该消息可能指的是 bla() 不是 String 对象上可用的函数。由于您缺少 $，这意味着您缺少一个函数，("asd") 将计算为字符串，然后 JavaScript 解释器将尝试调用 <该对象上的 code>bla() 。因此，如果您的项目中有以下代码：

String.prototype.bla = function() {};

// now this next line will execute without any problems:
("asd").bla();

那么，Ci 可能是一些内部 Firefox 符号，仅指代函数的概念。这是我的猜测，我想您需要了解 Firefox 内部结构的人才能更好地回答这个问题...

更新：我正在完全相同相同的版本中运行您的示例代码FF 和你一样，但它报告错误为：

错误：“asd”.bla 不是函数
源文件：file:///C:/test.html
行：3

也许您正在运行一个扩展/插件来执行此操作？也许有一些 Greasemonkey 脚本之类的？

I don't know which version of FF you are using, but regardless, the message is probably referring to the fact that bla() is not a function available on the String object. Since you were missing the $, which means you were missing a function, ("asd") would evaluate to a string, and then the JavaScript interpreter would try to call bla() on that object. So, if you had the following code in your project:

String.prototype.bla = function() {};

// now this next line will execute without any problems:
("asd").bla();

So, it is possible that Ci is some internal Firefox symbol that simply refers to the idea of a function. That is my guess, I imagine you are going to need someone that knows something about Firefox's internals to get a better answer to this question...

UPDATE: I am running your example code in the exact same version of FF as you are, but it reports the error as: