在Flex的，现在可以使用-define编译器选项做各种很酷的东西。 在我的计划，我现在用的选项，这样我的一些code被排除块这样的：

In Flex it is now possible to use the -define compiler option to do all sorts of cool stuff. In my program, I am using the option such that some of my code is excluded by blocks like this:

CONFIG::FACEBOOK{
   //Some code
}

这是运作良好。

And this is working well.

我要如何使用MXML一个类似的行为？

How do I get a similar behaviour with MXML?

我想要做同样的事情，但省略/包括MXML标签这种方式，AS code不是块。

I want to do the same thing, but omitting/including MXML tags in this way, not blocks of AS code.

推荐答案

我的解决办法是添加一些标签，可以帮助注释掉MXML code块不必要的某些版本。 比如我想在Android中增加不同的按钮和iOS构建：

My solution is to add some tags that could help to comment out unnecessary blocks of mxml code in certain build. For example I want to add different buttons in Android and iOS builds:

<!-- iOS --><!--
<s:Button id="backBtn" 
    icon="{SHOW_LIST}" 
    click="navigator.popView()"/>
--><!-- /iOS -->

<!--Android-->
<s:Button id="exitBtn" 
    label="Exit" 
    click="NativeApplication.nativeApplication.exit()"/>
<!--/Android-->

现在运行简单的批处理脚本，将注释掉所有的Andr​​oid特定的code源代码中为iOS打造

Now run simple batch script which will comment out all Android specific code in the source for iOS build

prepareForIos.cmd

@echo off
"C:\Program Files (x86)\bin\fart.exe" -r -w -- H:\Flash\MyProject\src\* "<!--Android-->" "<!-- Android --><!--"
"C:\Program Files (x86)\bin\fart.exe" -r -w -- H:\Flash\MyProject\src\* "<!--/Android-->" "--><!-- /Android -->"
"C:\Program Files (x86)\bin\fart.exe" -r -w -- H:\Flash\MyProject\src\* "<!-- iOS --><!--" "<!--iOS-->"
"C:\Program Files (x86)\bin\fart.exe" -r -w -- H:\Flash\MyProject\src\* "--><!-- /iOS -->" "<!--/iOS-->"
pause

放屁是一个命令行工具，用于查找和替换字符串

FART is a command-line tool for finding and replacing strings

现在我们code看起来是这样的，并准备为iOS待建：

Now our code looks like this and is ready to be built for iOS:

<!--iOS-->
<s:Button id="backBtn" 
    icon="{SHOW_LIST}" 
    click="navigator.popView()"/>
<!--/iOS-->

<!-- Android --><!--
<s:Button id="exitBtn" 
    label="Exit" 
    click="NativeApplication.nativeApplication.exit()"/>
--><!-- /Android -->

逆操作批次：

Inverse operation batch:

prepareForAndroid.cmd

@echo off
"C:\Program Files (x86)\bin\fart.exe" -r -w -- H:\Flash\MyProject\src\* "<!--Android-->" "<!-- Android --><!--"
"C:\Program Files (x86)\bin\fart.exe" -r -w -- H:\Flash\MyProject\src\* "<!--/Android-->" "--><!-- /Android -->"
"C:\Program Files (x86)\bin\fart.exe" -r -w -- H:\Flash\MyProject\src\* "<!-- iOS --><!--" "<!--iOS-->"
"C:\Program Files (x86)\bin\fart.exe" -r -w -- H:\Flash\MyProject\src\* "--><!-- /iOS -->" "<!--/iOS-->"
pause