#if的作用是指导编译器针对不同的情况分别编译。例如：
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#ifUNITY_ANDROID
Debug.Log(
"Android"
);
#endif
#if UNITY_IPHONE
Debug.Log(
"IOS"
);
#endif
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众所周知，Unity跨平台非常的多，下面是所有平台的关键字
UNITY_EDITOR |
Define for calling Unity Editor scripts from your game code. |
UNITY_STANDALONE_OSX |
Platform define for compiling/executing code specifically for Mac OS (This includes Universal, PPC and Intel architectures). |
UNITY_DASHBOARD_WIDGET |
Platform define when creating code for Mac OS dashboard widgets. |
UNITY_STANDALONE_WIN |
Use this when you want to compile/execute code for Windows stand alone applications. |
UNITY_STANDALONE_LINUX |
Use this when you want to compile/execute code for Linux stand alone applications. |
UNITY_STANDALONE |
Use this to compile/execute code for any standalone platform (Mac, Windows or Linux). |
UNITY_WEBPLAYER |
Platform define for web player content (this includes Windows and Mac Web player executables). |
UNITY_WII |
Platform define for compiling/executing code for the Wii console. |
UNITY_IPHONE |
Platform define for compiling/executing code for the iPhone platform. |
UNITY_ANDROID |
Platform define for the Android platform. |
UNITY_PS3 |
Platform define for running PlayStation 3 code. |
UNITY_XBOX360 |
Platform define for executing Xbox 360 code. |
UNITY_NACL |
Platform define when compiling code for Google native client (this will be set additionally to UNITY_WEBPLAYER). |
UNITY_FLASH |
Platform define when compiling code for Adobe Flash. |
UNITY_BLACKBERRY |
Platform define for a Blackberry10 device. |
UNITY_WP8 |
Platform define for Windows Phone 8. |
UNITY_METRO |
Platform define for Windows Store Apps (additionally NETFX_CORE is defined when compiling C# files against .NET Core). |