参考:https://baijiahao.baidu.com/s?id=1654419465068708673&wfr=spider&for=pc 参考:https://www.jianshu.com/p/be1af489551c 参考:https://blog.csdn.net/qq_37164847/article/details/81668242
获取项目的绝对路径和根目录
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