The object returned by this method functions as a placeholder for a constructed generic type in your emitted code. 此方法返回的对象作为发出代码中构造泛型类型的占位符。
The object in turn exposes information about browser capabilities using strongly typed properties and a generic name-value dictionary. 该对象随后使用强类型属性和泛型名称值字典公开有关浏览器功能的信息。