推荐回答（1个）
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最近书生在看中国古代的神话传说就产生了一个问题，九重天上的天庭又没有墙要门干什么，在《西游记》中大家都知道天庭有个南天门，是天庭的门户关口还得派人去守，现代有些电视剧电影直接就说二郎神和哮天犬还有哪吒三太子在镇守南天门，有过这回事吗？这南天门到底有什么用？取经路上孙悟空老上天，闯南天门为什么看起来那么轻松？
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在中国古代神话传说中，天庭是有南天门的至于守将是谁？不知道没细说不过在《封神演义》中倒是提过佳梦关的魔家四兄弟：
南方增长天王：名魔礼青，长二丈四尺，面如活蟹，须如铜线。手持青锋宝剑，上有符印，中分四字：‘地，水，火，风’，这风乃黑风，风内有万千戈矛。
东方持国天王：名魔礼海，用一根枪，背上一面琵琶，上有四条弦，也按‘地、水、火、风’，拨动弦声，风火齐至。
北方多闻天王：名魔礼红，手持混元伞，以伞之义谐“雨”；伞上有祖母绿，祖母印，祖母碧，有夜明珠，碧尘珠，碧火珠，碧水珠，消凉珠，九曲珠，定颜珠，定风珠，还有珍珠穿成四字“装载乾坤”。这把伞不敢撑，撑开时，天昏地暗，日月无光；转一转，乾坤晃动。
西方广目天王：名魔礼寿，用两根鞭。囊里有一物，形如白鼠，名曰“花狐貂”，放起空中，现身似白象，肋生飞翅，食尽世人。
后来四人在佳梦关杀周军无数被黄天化给杀了，在封神榜上被姜子牙封为“四大天王”负责看守南天门。
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至于杨戬有没有看守南天门不知道，反正在《封神演义》中玉皇大帝派天使给杨戬宣读任命诏书，杨戬直接在诏书上写了“听调不听宣”。倒是哮天犬据说是二郎神杨戬在南天门捡到的一只“流浪狗”，不知是不是真的。估计哪吒三太子可能守过南天门，毕竟在名义上托塔李天王是“魔家四大天王”的上司。
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还记得《西游记》中孙悟空把如意金箍棒伸到了天宫，其实就是伸到了南天门。叫什么孙悟空伸金箍棒到南天门，天庭众神被激怒了。于是玉皇大帝派顺风耳千里眼开南天门，二人看得很仔细就回去禀报玉帝说：“臣奉旨观听金光之处，乃下界碗口粗细一根铁棒，于东胜神洲我东部海域冉放金光，射冲斗府。”也就是说关了南天门就进不了天宫，里面的神仙也出不了天宫。
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大家说这南天门要不要守？估计天庭还有其它门但是正门可能就是南天门，这可是脸面如果孙悟空不闹出那么大的动静，天庭上的神仙关上大门也不会理凡间的事。至于孙悟空进出南天门为什么那么容易？想想魔家四兄弟在花果山使出了看家本领，还是没擒拿住妖猴，就可知这四个人不是孙悟空的对手，但是不代表“四大天王”不厉害也就是孙悟空有72变和筋斗云，这不孙悟空在保唐僧去取经的路上，经常去天庭搬救兵老闯南天门，四大天王也拿他没办法，要知道九重天上的天庭是想来就来想走就走的吗？好歹也先敲门不是。
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由此可见不见南天门就不见天庭，虽然天庭没墙，但是它待在一个次元空间里，它唯一开放的进出路口就是“南天门”。
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