if else语句会根据条件的不同选择性的执行不同的程序下面的程序当12管脚状态为高时点亮LED，反之熄灭LED1211HIGH11LOWdm9pZCBzZXR1cCgpewogIHBpbk1vZGUoMTIsIElOUFVUKTsKICBwaW5Nb2RlKDExLCBPVVRQVVQpOwp9Cgp2b2lkIGxvb3AoKXsKICAvL2lmIGVsc2Xor63lj6XkvJrmoLnmja7mnaHku7bnmoTkuI3lkIzpgInmi6nmgKfnmoTmiafooYzkuI3lkIznmoTnqIvluo8KICAvL+S4i+mdoueahOeoi+W6j+W9kzEy566h6ISa54q25oCB5Li66auY5pe254K55LquTEVE77yM5Y+N5LmL54aE54GtTEVECiAgaWYgKGRpZ2l0YWxSZWFkKDEyKSkgewogICAgZGlnaXRhbFdyaXRlKDExLEhJR0gpOwoKICB9IGVsc2UgewogICAgZGlnaXRhbFdyaXRlKDExLExPVyk7CgogIH0KCn0=