Try --force to use installed plugin as dependency.
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cordova plugin add cordova-plugin-camera
Installing "cordova-plugin-camera" for android
Failed to install 'cordova-plugin-camera': CordovaError: Version of installed plugin: "cordova-plugin-compat@1.0.0" does not satisfy dependency plugin requirement "cordova-plugin-compat@^1.1.0". Try --force to use installed plugin as dependency.
at C:\Users\cluo\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\plugman\install.js:581:33
at _fulfilled (C:\Users\cluo\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:787:54)
at self.promiseDispatch.done (C:\Users\cluo\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:816:30)
at Promise.promise.promiseDispatch (C:\Users\cluo\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:749:13)
at C:\Users\cluo\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:509:49
at flush (C:\Users\cluo\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:108:17)
at _combinedTickCallback (internal/process/next_tick.js:73:7)
at process._tickCallback (internal/process/next_tick.js:104:9)
Error: Version of installed plugin: "cordova-plugin-compat@1.0.0" does not satisfy dependency plugin requirement "cordova-plugin-compat@^1.1.0". Try --force to use installed plugin as dependency
错误信息大概意思就是，你如果要安装 cordova-plugin-camera 插件，首先得强制把compat升级到1.1.0的版本，执行以下命令：
cordova plugin remove --force cordova-plugin-compat
cordova plugin add cordova-plugin-compat
cordova plugins
cordova platform remove android
cordova platform add android
cordova plugin add cordova-plugin-camera
