像其他值类型一样，未初始化枚举的默认值为零。
The default value of an uninitialized enumeration, just like other value types, is zero.
命中测试筛选回调函数的返回值确定可视化对象的枚举应执行的操作类型。
The return value of the hit test filter callback function determines what type of action the enumeration of the visual objects should take.
命中测试筛选回调函数的返回值确定可视化对象的枚举应执行的操作类型。
The return value of the hit test filter callback function determines what type of action the enumeration of the visual objects should take.
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