S2N("N2S","S2W",false),S2W("N2E","E2W",false),E2W("W2E","E2S",false),E2S("W2N","S2N",false),
        N2S(null,null,false),N2E(null,null,false),W2E(null,null,false),W2N(null,null,false),
        S2E(null,null,true),E2N(null,null,true),N2W(null,null,true),W2S(null,null,true)

视频上这么写,还是不太好懂啊

大神给指点一下