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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256
｜
第
22
章
户的数据了。比如说你的表单标签是
<form action="/submit/email" method="POST">
，
然后在
Ajax
代码里
，通过
DOM
操作可以从表单中获得
action
，并在
Ajax
表单提交的
代码中使用。
至少提供一层冗余
很可能你会想把意向客户的信息保存到一个数据库或者是像
Campaign
Monitor
这样的
外部服务中去。但如果数据库出现了故障，或是
Campaign
Monitor
服务停机了，或是
出现了网络问题，那么该怎么办呢？如果你不想丢失这些信息，就需要增加冗余。存储
信息的同时发送一封邮件，这是增加冗余的常见办法。如果这样做，就不要使用个人邮
箱，而应该使用共享邮箱（比如
dev@meadowlarktravel.com
）
。如果你是把邮件发送给
某一个人，而这个人离开了你们组织，那么这个信息冗余就没有什么用处了。你也可以
把意向客户的信息存储到备用数据库，甚至
CSV
文件里
。不过，
不管任何时候
你的主
存储出现了故障，都应该有某种警告机制。而从冗余存储里收集信息只是事情的一半，
意识到故障并采取适当的措施是事情的另一半。
万一存储全部出了问题，要通知用户
比如说你有
3
层冗余
：你的主存储是
Campaign Monitor
服务，如果它失败了，就保存
到
CSV
文件
，并发送一封邮件到
dev@meadowlarktravel.com
。如果
所有
这些存储通道
都失败了，那么用户应该能收到一条类似这样的消息：“很抱歉，我们遇到了技术问题。
请过一会儿再试，或者联系
support@meadowlarktravel.com ...
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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.