因此在使用方法或者属性之前我们必须对浏览器的支持性做必要的检查。

Therefore we must first check if the browser supports the methods or properties we want to use.

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清单4显示了使用方法而非属性来指定适当类的单例。

Listing 4 shows a version of the singleton that USES a method instead of an attribute to specify the appropriate class.

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认识到有必要为 Web 组件指定操作和验证方法后，JSF EL 变体添加了一个允许在属性内使用方法表达式的特性。

Recognizing the need to specify action and validation methods for a Web component, the JSF EL variant added another feature allowing you to use method expressions within an attribute.

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