JavaScript 中的“如果调试”？
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"if debug" in JavaScript?
提问by Martin
Is there anything in JavaScript or Visual Studio to detect if the code is used in debug-mode? Something like "#if DEBUG" in C#, but for JavaScript?
JavaScript 或 Visual Studio 中是否有任何内容可以检测代码是否在调试模式下使用？类似于 C# 中的“#if DEBUG”，但对于 JavaScript？
采纳答案by M?rten Wikstr?m
No.
不。
#if/#endifare preprocessor directives in C# (and other languages) that tells the compiler to conditionally include/exclude a section of code when compiling.
#if/#endif是 C#（和其他语言）中的预处理器指令，它告诉编译器在编译时有条件地包含/排除一段代码。
JavaScript is a script language that is not precompiled, and therefore it would not make much sense to have preprocessor directives like these.
JavaScript 是一种未预编译的脚本语言，因此拥有这样的预处理器指令没有多大意义。
回答by Zoltán Tamási
A bit late, but I needed the same and could not give up until a viable solution.
有点晚了，但我需要同样的东西，并且在找到可行的解决方案之前不能放弃。
I have a kind of "main" javascript file, where I have a line like:
我有一种“主要”javascript文件，其中有一行：
Site.DEBUG = false;
Then in the code I can check for this constant. Now I needed to solve that at build time, some automation would set this for me according to project configuration. Here I've found fnr.execommand-line tool for find and replace in files. It's a quite good piece of utility, would be worth to check out anyway. So at this point I've created a folder in the project directory called BuildScripts, I've copied the fnr.exefile into it, and created a batch file like this.
然后在代码中我可以检查这个常量。现在我需要在构建时解决这个问题，一些自动化会根据项目配置为我设置这个。在这里，我找到了用于在文件中查找和替换的fnr.exe命令行工具。这是一个相当不错的实用程序，无论如何都值得一试。所以此时我已经在项目目录中创建了一个名为 的文件夹BuildScripts，我已经将fnr.exe文件复制到其中，并创建了一个这样的批处理文件。
switch_client_debug.bat
REM Params: path to folder, filename, change-DEBUG-from-this, to-this
fnr.exe --cl --dir "%1" --fileMask "%2" --caseSensitive --showEncoding --find "DEBUG = %3" --replace "DEBUG = %4"
Then I defined the corresponding pre-build events at the web project like this:
然后我在 web 项目中定义了相应的预构建事件，如下所示：
cd $(ProjectDir)BuildScripts
call switch_client_debug.bat $(ProjectDir)ts site.ts false true
and its pair at Release config:
及其在发布配置中的配对：
cd $(ProjectDir)BuildScripts
call switch_client_debug.bat $(ProjectDir)ts site.ts true false
Now everything works like a charm and I can have logging, tracing, special logic for Debug and for Release configuration in Javascript.
现在一切都像魅力一样工作，我可以在 Javascript 中为调试和发布配置进行日志记录、跟踪、特殊逻辑。
回答by alessandro
Only for IE there is the conditional compilation:
只有 IE 才有条件编译：
/*@cc_on
@set @version = @_jscript_version
@if (@_win32)
document.write("You are running 32 bit IE " + @version);
@elif (@win_16)
document.write("You are running 16 bit IE " + @version);
@else @*/
document.write("You are running another browser or an old IE.");
/*@end @*/
