The first argument to the add function is a symbolic name, by which the generated page can be referred to in the notebook: we will make use of it below.
add函数的第一个参数是一个符号名，可以在notebook中通过它引用生成的页：下面我们将使用它。
The first page of the application is shown in Figure 2, with the values of apacheu entered for the user name and password.
应用程序的第一个页面如图2所示，输入apacheu作为用户名和密码。
The first one, with the name of page_title, allows you to override the value for the header of the page.
第一个的名称是page _ title，允许您重写页眉的值。
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