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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218
｜
第
19
章
价。我见过页面的加载时间因为额外的
HTTP
请求而变成了原来的
2
倍甚至
3
倍的情况。
如果页面性能对你来说很重要（应该是这样的，尤其是从移动端用户的角度考虑），就需
要仔细考虑应该如何集成社交媒体。
虽然这么说，但是实现了
Facebook
的“喜欢”按钮或“发推”按钮的代码还是需要利用浏
览器内的
Cookie
并以用户的名义提交。要把这个功能移到后端，可能会很困难（而且，在
有些情形中是不可能的）。因此，如果你需要的是“喜欢”按钮或“发推”按钮那样的功
能，那么在页面中引用合适的第三方库是你最好的选择，即使它会影响页面的性能。
19.1.2
搜索推文
如果希望展现最近
10
条包含主题标签“
#Oregon #travel
”的推文，的确可以使用一个前端
组件来实现，但这样做会产生额外的
HTTP
请求
。而如果在后端实现，则可以为了满足性
能的需要而缓存这些推文。而且，如果搜索是在后端进行的，就可以把一些很刻薄的推文
“拉黑”，但在前端实现就会相对困难一些。
跟
Facebook
一
样，
Twitter
允许你创建
应用
。说是应用，其实有些不恰当，因为一个
Twitter
应用并不做任何事情（在传统意义上）。它更像是在网站上可以用来创建实际应用的“凭
证”。要访问
T
witter API
，最容易且最可移植的方式是创建一个应用，再通过这个应用来
获取访问令牌。
要想创建
T
witter
应用，首先需要进入它的开发者中心。先确认登录，然后点击导航栏
中你的用户名，再点击
Apps
。接着点击
“
Create an app
”，并遵照说明操作 ...
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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.