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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质量保证
｜
37
5.2
QA
：
是否值得
QA
的成本可能会很高——有时会
极
高，那么这么做是否值得？这很难说。大多数组织会
使用某种“投资回报”模型进行评估。我们花一笔钱，必然期望收回成本（多一些更好）。
可是对于
QA
来说
，这种关系会非常复杂。举个例子，一个已经取得地位和好评的产品可
能需要比新的不知名产品花更多时间来解决质量问题。显然，没人
想
制造劣质产品，但是
生产上承受的各种压力是很大的。产品的投产时间非常关键，有时宁可尽快把不完美的产
品推向市场，也不能等数月后再推完美的产品。
在
We
b
开发中，质量可以划分为
4
个维度。
用户覆盖
用户覆盖指的是产品市场渗透，即浏览网站或使用服务的人数。用户覆盖跟盈利能力直
接相关：访问网站的人越多，购买产品或服务的人就越多。从开发的视角来看，搜索引
擎优化（
SEO
）对用户覆盖的影响最大，这就是为什么我们的
QA
计划会包含
SEO
。
功能实现
一旦人们开始访问你的网站或使用你的服务，功能实现的质量就会对用户留存率产生极
大影响。相比实际与宣传不符的网站，实际与宣传完全相符的网站运行起来更有可能获
得用户的回访。自动化测试适用于评估功能实现。
易用性
功能实现关注的是功能的正确性，易用性评估的则是人机交互（
HCI
）方面
。要评估的
基本问题就是“这个功能以这种方式来呈现，对目标用户有用吗？”这常常可以转换为
“这易用吗？”不过，对易用性的追求往往有悖于软件的灵活性或强大功能：程序员觉
得容易的东西跟无技术背景的消费者觉得容易的东西也许完全不同。换句话说，在评估
易用性时必须考虑目标用户。既然易用性衡量的基本输入来自用户，那么它通常是不可 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.