JS奇怪 [英] JS strangeness

问题描述

（我不知道这个问题是否已被多次询问和回答，

因为我刚刚加入这个组并且没有尝试搜索

档案。）


我正在构建一个使用jQuery的页面，而且相当于
。当我在Firefox下本地运行时，一切正常，

但是当我在主机网站上运行时，我经常遇到困难

以下类型。我有一个$（document）.ready（）函数，

引用在其他JS脚本中定义的变量和元素

（内联），或者在HTML中。有时（但并非总是），引用

这些变量或元素中的一个解析为空指针，

中止执行我的$（文档）.ready（ ）功能导致FF

挂在错误的地方。例如，我有一个JS变量

称为''calimg''，它应该是一个包含图像文件的URL

的字符串，如果我看的话在源代码中，就是在包含$

（文档）.ready（）函数的脚本之前放置的脚本中定义它是如何定义的。但是，Firebug经常报告，当$（document）.ready（）函数运行时，
变量''calimg''没有定义。造成这种情况的原因是什么，我该怎么办？

(I don''t know if this question has been asked and answered many times,
since I just joined this group and haven''t attempted to search the
archives.)

I have a page under construction which uses jQuery and is fairly
massive. When I run it locally under Firefox, everything works fine,
but when I run it on the host site, I frequently run into difficulties
of the following type. I have a $(document).ready() function that
references variables and elements defined either in other JS scripts
(inline), or in the HTML. Sometimes, but not always, a reference to
one of these variables or elements resolves to a null pointer, which
aborts the execution of my $(document).ready() function and causes FF
to get hung up in the wrong place. For example, I have a JS variable
called ''calimg'', which is supposed to be a string containing the URL
of an image file, and if I look at the source, that is how it is
defined, in a script that is placed before the script containing the $
(document).ready() function. But often, Firebug reports that the
variable ''calimg'' is not defined when the $(document).ready() function
runs. What is causing this, and what can I do about it?

推荐答案

（文件）.ready（）函数

引用在其他JS脚本中定义的变量和元素

（内联），或HTML中。有时，但并非总是如此，引用

这些变量或元素之一解析为空指针，

中止执行我的

(document).ready() function that
references variables and elements defined either in other JS scripts
(inline), or in the HTML. Sometimes, but not always, a reference to
one of these variables or elements resolves to a null pointer, which
aborts the execution of my

（document）.ready（）函数并导致FF

挂在错误的地方。例如，我有一个JS变量

称为''calimg''，它应该是一个包含图像文件的URL

的字符串，如果我看的话在源代码中，就是在包含

(document).ready() function and causes FF
to get hung up in the wrong place. For example, I have a JS variable
called ''calimg'', which is supposed to be a string containing the URL
of an image file, and if I look at the source, that is how it is
defined, in a script that is placed before the script containing the

的脚本之前放置的脚本中，定义了它是如何定义的（b
） document）.ready（）函数。但通常，Firebug报告说

(document).ready() function. But often, Firebug reports that the
variable ''calimg'' is not defined when the

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