我的世界怎么做自动桥

首先我们在需要铺设铁轨的地方放置一块命令方块

命令方块获取代码：

/summon MinecartCommandBlock ~-1 ~ ~ {Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Command:"/setblock ~-1 ~1 ~ 0 0 destroy"},Command:"/setblock ~-1 ~ ~ 0 0 destroy"},Command:"/setblock ~-1 ~-2 ~ 152 0 replace"},Command:"/setblock ~-1 ~-1 ~ 157 0 replace"}

然后在命令方块的W方向放置一块红石，并且在红石上面放一个激活的铁轨，记得命令方块需要在红石块的上方。

完成后可以右击按钮来激活命令方块，然后会发现在命令矿车出现在命令方块的下方。然后尝试推一下命令矿车，就会发现铁轨和红石块会不停地复制了。

如果是想要其他的方向来铺设铁轨，用同样的道理就可以了。

4个方向不同的代码(往哪个方向挖就用哪个方向的代码)：

W方向：

/summon MinecartCommandBlock ~-1 ~ ~ {Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Command:"/setblock ~-1 ~1 ~ 0 0 destroy"},Command:"/setblock ~-1 ~ ~ 0 0 destroy"},Command:"/setblock ~-1 ~-2 ~ 152 0 replace"},Command:"/setblock ~-1 ~-1 ~ 157 0 replace"}

S方向：

/summon MinecartCommandBlock ~ ~ ~1 {Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Command:"/setblock ~ ~1 ~1 0 0 destroy"},Command:"/setblock ~ ~ ~1 0 0 destroy"},Command:"/setblock ~ ~-2 ~1 152 0 replace"},Command:"/setblock ~ ~-1 ~1 157 0 replace"}

E方向：

/summon MinecartCommandBlock ~1 ~ ~ {Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Command:"/setblock ~1 ~1 ~ 0 0 destroy"},Command:"/setblock ~1 ~ ~ 0 0 destroy"},Command:"/setblock ~1 ~-2 ~ 152 0 replace"},Command:"/setblock ~1 ~-1 ~ 157 0 replace"}

N方向：

/summon MinecartCommandBlock ~ ~ ~-1 {Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Riding:{id:"MinecartCommandBlock",Command:"/setblock ~ ~1 ~-1 0 0 destroy"},Command:"/setblock ~ ~ ~-1 0 0 destroy"},Command:"/setblock ~ ~-2 ~-1 152 0 replace"},Command:"/setblock ~ ~-1 ~-1 157 0 replace"}