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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:Step 2: Exhaust Time杨长帆笑道：这怪灰蛋子，他没尽职维护。呵，呵呵。生活在美国的少年路杰是赛车天才，其父杰森却一直禁止他碰车。路杰偷偷参加了一次黑市赛车，意外的被车队经理张博一眼看中，张博说服路杰加入车队，开始了自己的赛车梦想。路杰与张博携手奋斗，战胜老牌车手大卫，迅速成长为一颗新星，并以自己对赛车的激情感动了杰森，化解父子间的心结。两个男孩还同时爱上了古灵精怪的中国女孩纪春晓。然而，急功近利的张博却意外害死了杰森使得兄弟反目成仇。司马二是成名已久的武侠名家，可以说他就是武侠小说界的一面旗帜，几乎可以代替武侠小说界。After the setup is successful, the module will be installed in D:\ vueProject\ nodejs\ node_global with the command npm install XXX-g