How to set up error handlers.

如何建立错误处理器。

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As we did for USERNAME in the previous step, set the value as required on the validation TAB, and set the control up to display validation error messages in an error message control.

如我们上一步对USERNAME做的一样，将验证选项卡上的值设为必须，然后在错误消息控制中设定显示验证错误消息。

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When you set up your 404 error page, make sure that the server delivers a 404 error code if a page doesn't exist.

在设置404错误页面的时候，一定要确保服务器提交一个404错误代码，如果某个页面不存在的话。

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Number one, the basic structure is that you have a pointer and it points over to a pointee, but the pointer and pointee are separate and the common error is to set up a pointer but to forget to give it a pointee.

第一，基本结构是，你有一个,指向数据的指针，但是那个指针和数据,是分开的，通常错误是声明了一个指针,但是没有指向一个数据。

哈佛公开课 - 计算机科学课程节选

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