June 2021
Intermediate to advanced
290 pages
9h 21m
Chinese
Content preview from Node与Express开发（第2版）
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80
｜
第
8
章
8.4
处理表单的不同做法
如果不使用
Ajax
，就只能通过浏览器提交表单了，这样做的结果是会刷新页面。不过，页
面要
怎样
刷新由你决定。当处理表单时，有两件事情需要考虑：由哪个路径处理这个表单
（表单中的
action
）以及给浏览器返回什么样的响应。
如果使用
method="POST"
（这是推荐做法），那么显示表单和处理表单都使用同一个路径也
是相当常见的。不过，它们是可以区分的，因为显示表单是一个
GET
请求，而处理表单是
一个
POST
请求。如果采取这种做法，就可以忽略表单的
action
属性。
另一个选择是使用另外的路径来处理表单。例如，如果联系信息页使用了路径
/contact
，可
以使用路径
/process-contact
来处理表单
（通过指定
action="/process-contact"
）。如果采
取这种做法，就可以选择使用
GET
来提交表单（我不推荐这样做，因为在
URL
上暴露表
单的字段毫无必要）。如果有多个
URL
是同样的提交途径
（例如，网站的多个页面都有使
用邮箱地址的注册框），那么为表单提交提供单独的端点或许会更好。
不管用什么路径来处理表单，都需要决定给浏览器返回什么样的响应。你有以下几种选择。
直接 HTML 响应
处理完表单之后，可以直接把
HTML
发回浏览器
（比如说一个视图）。如果试图刷新页
面，浏览器就会给出一条警告信息。而且这样做还会影响到浏览器的书签和返回按钮。
所以，不推荐这种做法。
302 重定向
尽管这是常见的做法，但它是对
302
（已找到）状态码最初含义的误用。
HTTP
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.