cordova ionic error命令失败，退出代码为2

Question

当我执行cordova build时，我有这个错误 - 释放android，

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   cordova build --release android
Running command: "C:\Program Files (x86)\nodejs\node.exe" C:\Users\Dell\MRTv3\hooks\after_prepare\010_add_platform_class.js C:\Users\Dell\MRTv3 add to body class: platform-android
 Running command: cmd "/s /c "C:\Users\Dell\MRTv3\platforms\android\cordova\build
.bat --release""
[Error: ANDROID_HOME is not set and "android" command not in your PATH. You must
 fulfill at least one of these conditions.]
ERROR building one of the platforms: Error: cmd: Command failed with exit code 2

You may not have the required environment or OS to build this project
Error: cmd: Command failed with exit code 2
    at ChildProcess.whenDone (C:\Users\Dell\AppData\Roaming\npm\node_modules\cor
dova\node_modules\cordova-lib\src\cordova\superspawn.js:139:23)
    at emitTwo (events.js:87:13)
    at ChildProcess.emit (events.js:172:7)
    at maybeClose (internal/child_process.js:817:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:211:5)

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