The valid.css file (see Listing 10) defines the ValidationError style class that is used for the error messages

css文件（参见清单10）定义了用于错误消息的ValidationError样式类

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The validator method receives the user's input as a parameter and may return an error message, which is stored in a JSP variable named validationError.

validator方法将用户输入作为参数，并且可能会返回一条错误消息，保存在一个名为 validationError 的JSP变量中。

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The validator method receives the user's input as a parameter and may return an error message, which is stored in a JSP variable named validationError.

validator方法将用户输入作为参数，并且可能会返回一条错误消息，保存在一个名为 validationError 的JSP变量中。

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