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var Direction;
(function (Direction) {
Direction[Direction["Up"] = 10] = "Up";
Direction[Direction["Down"] = 11] = "Down";
Direction[Direction["Left"] = 12] = "Left";
Direction[Direction["Right"] = 13] = "Right";
})(Direction || (Direction = {}));
以上是ts的枚举类型编译出来的代码，通过赋值时有返回值，做到双向映射，竟然还有这样的写法！
(function (Direction) {
Direction[Direction["Up"] = 10] = "Up";
Direction[Direction["Down"] = 11] = "Down";
Direction[Direction["Left"] = 12] = "Left";
Direction[Direction["Right"] = 13] = "Right";
})(Direction || (Direction = {}));
以上是ts的枚举类型编译出来的代码，通过赋值时有返回值，做到双向映射，竟然还有这样的写法！
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