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例子中有点小bug,right方法对当前rot判断 会因为left 把rot变成3之后,再right,rot会一直增长 #2

@laisxn

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@laisxn

var fun = {
right: function () {
if (param.rot === 3) {
param.rot = -1;
}
param.rot += 1;
param.img.className = "rot" + param.rot;

    },
    left: function () {
        param.rot -= 1;
        if (param.rot === -1) {
            param.rot = 3;
        }
        param.img.className = "rot" + param.rot;
    }
};

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