In many cases, we tend to only pay attention to the control of the first type of error, while the second type of error often being not considered.
在很多时候，我们往往只注意第一类错误的控制，而对于第二类错误经常不考虑。
BC mode impacts numeric comparisons in two ways: allowing selection of the first member of a set and obtaining NaN for a non-numeric value, rather than throwing a type error.
BC模式对数字比较的影响有两个方面：允许选择集合的第一个成员，对于非数字值返回NaN而不是抛出类型错误。
Add some control to the Web application to display the localized messages. First, add a String variable key to record what type of error occurs for Login.java
向 Web 应用程序中添加一些控制来显示地方化的消息。
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