Design reusable code so that other developers can inherit properties and methods from your control.
请设计可重复使用的程序码,使其他的开发人员能够从您的控制项继承属性和方法。
Once extended, the base type will inherit the properties of the new extended type in addition to its own definition.
一旦被扩展,除了自身的定义外,这个基类型将继承新扩展的类型的属性。
A type may be a subType of another type, and can inherit all its properties.
类型可以为其他类型的子类型,可以集成这个类型的所有属性。
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