September 2022
Intermediate to advanced
585 pages
8h 17m
Chinese
Content preview from JavaScript 经典实例：第三版
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
56
｜
第
2
章
汉堡表情符号的十六进制编码为
U+1F354
。在
fromCodePoint()
方
法中使用时，要
把前缀
U
+
替换为
0x
。
包含表情符号的字符串可以写入开发者控制台，或者显示在网页中，与包含常规字
符的常规字符串没有差别。
2.4.3
讨论
截至
2020
年，世界上有超过
3000
个表情符号。你可以打开
Full Emoji List
网 站（
https://
oreil.ly/IIguA
）查看所有表情符号及对应的十六进制值。存在的表情符号不一定受
想用的设备支持，因此要事先测试兼容性。
处理包含表情符号的字符串时，其他问题可能随之浮现。例如，你觉得下面这段代
码的结果是什么？
const hamburger = '
emoji exists doesn’t mean it will be supported on the devices where you plan to use it,
so test for compliance early.
If you need to do string processing with strings that may include emojis, other issues
can crawl out of the woodwork. For example, what do you expect this code will find?
const hamburger = '';
const hamburgerLength = hamburger.length; ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.