请注意两种对象属性访问方式之间的重要差异。
Notice the important difference between the two ways of accessing object properties.
认为研究对象上的差异处于核心地位。
Among them, the difference on research object is in the core position.
这种差异并不影响传递至函数的对象；
This difference has no effect on the objects that can be passed to the function;
这种差异并不影响传递至函数的对象；
This difference has no effect on the objects that can be passed to the function;
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