... 使整个DIV可点击 （Make the entire DIV clickable） 克隆对象 （Clone a object） 使元素居中屏幕 （Center an element on the screen） ...
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Because clone has protected access in Object and, to call clone , you have to call it through a reference to a class that has overridden clone to be public.
因为clone在Object中是保护访问的，调用clone必须通过将clone改写公共访问的类引用来完成。
Therefore when you make a change in the data member object, the original and the clone will be both changed.
因此，当你修改这个对象中的一个数据成员时，原始的和克隆的数据成员都会被改变。
A deep clone of an object creates a copy of the object and a copy of everything directly or indirectly referenced by that object.
对象的深层克隆创建对象的副本以及该对象直接或间接引用的所有内容的副本。
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