Use the element only selector type if it is in fact global.

如果 element only 选择器类型确实是全局的，则使用它。

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Of course, normal CSS selector rules apply, and you can exploit them to apply different styles to the same widget type depending on its context.

当然，普通的 CSS 选择器规则也可以应用，所以可以根据小部件的上下文，用选择器规则在同一小部件上应用不同的样式。

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To implement this RESTful service, a function selector class will be implemented for selecting a correct service function according to the type of HTTP method and returning the function name.

为了实现这个RESTful服务，要实现一个函数选择器类，它根据HTTP方法的类型选择正确的服务函数并返回函数名。

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