September 2022
Intermediate to advanced
585 pages
8h 17m
Chinese
Content preview from JavaScript 经典实例：第三版
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字符串和正则表达式
｜
53
在
en-US
区域，这个对象添加逗号分隔符，但是不保留固定的小数位，也不添加货
币符号。
Intl.NumberFormat
对象支持很多选项。你可以改变负数的显示方式，可以设定最
小和最大位数，可以显示百分数，也可以选择某些语言中的其他编号系统。完整的
信息参阅
Mozilla Developer Network
参考手册（
https://oreil.ly/JEF4Q
）。
你可能会遇到区域设置的旧版写法，使用的是
Number.toLocaleString()
方法。下
面举个例子。
const
someNumber = 1242.0005;
const
moneyString = someNumber.toLocaleString(
'en-US', { style: 'currency', currency: 'USD' });
这种方式完全有效，但是如果你打算格式化一长串数字，重用一个
Intl.
NumberFormat
对象的性能更好。
2.2.4
参考
如果你想获得的格式化支持比
Intl.NumberFormat
提供的功能更多，可以使用第三
方库，例如
Numeral.js
（
https://github.com/adamwdraper/Numeral-js
）。
2.3
插入特殊字符
2.3.1
问题
你想在字符串中插入特殊字符，例如换行符。
2.3.2
方案
对很多特殊的字符来说，最简单的方法是直接把字符粘贴到编辑器中。比如说你需
要一个版权符号（
©
），首先在桌面实用程序，例如（
Windows ...
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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.