Mac OS x 启动项设置 Mac OS X的启动原理: 1,mac固件激活,初始化硬件,加载BootX引导器. 2,BootX加载内核与内核扩展(kext). 3,内核启动launchd进程. 4,launchd根据 /System/Library/LaunchAgents ,/System/Library/LaunchDaemons , /Library/LaunchDaemons,/Library/LaunchAgents , ~/Library/LaunchAgents里的plist配