Then define a function which computes the area for the rectangle object.

然后定义一个函数来计算Rectangle的面积。

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Here every Rectangle object created will have three properties - height, width and area.

在这里矩形对象中会有会个属性，height, width和area。

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Hence prototype object is the best place to define methods like area which remain the same for all Rectangle objects.

因此prototype对象是一个最理想地方来存储像area这个所有对象都相同的属性。

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