JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home"exportJAVA_HOMECLASS_PATH="$JAVA_HOME/lib"PATH=".$PATH:$JAVA_HOME/bin"PATH=$PATH:/usr/local/bin/exportPATH="$HOME/.yarn/bin:$PATH"这三行没怎么看懂,请问是什么意思PATH=".$PATH:$JAVA_HOME/bin"PATH=$PATH:/usr/local/bin/exportPATH="$HOME/.yarn/bin:$PATH"
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