.split（/ \\ s + /）和.split（“”）之间的区别？
[英]Difference between .split(/\s+/) and .split(“ ”)?
问题描述
:) First of all, sorry my bady english :p I was taking a look to the next js code fragment: 
:)首先，对不起我的bady english：p我正在查看下一个js代码片段：
var classes = element.className.split(/\s+/);
That code will split the full classname of and element into an array containing every class... but, what's the difference between using .split(/\\s+/) , and using .split(" ") ? 该代码将完整的类名和元素分成包含每个类的数组......但是，使用.split(/\\s+/)和使用.split(" ")之间有什么区别？ i see the same result... 我看到相同的结果......
I tested this with the next simple code in Chrome: 我使用Chrome中的下一个简单代码对此进行了测试：
<!DOCTYPE html>
<html>
<body>
<div id="cono" class="clase1 clase2 clase3-xD">
</div>
<script>
var d = document.getElementById("cono");
console.log(d.className);
var classes = d.className.split(" ");
for (i in classes) {
console.log(classes[i]);
}
</script>
</body>
</html>
I have the same result whether i use .split(" ") or .split(/\\s+/) : 无论我使用.split(" ")还是.split(/\\s+/)我都有相同的结果：
clase1 clase2 clase3-xD
clase1
clase2
clase3-xD
Do they have any relevant difference? 他们有任何相关的区别吗？
3 个解决方案
解决方案1
10 2015-01-24 16:47:38
No, .split(/\\s+/) , and .split(" ") are different ones. 不， .split(/\\s+/)和.split(" ")是不同的。 \\s+ matches one or more space characters including line breaks where " " matches a single horizontal space character. \\s+匹配一个或多个空格字符，包括换行符，其中" "匹配单个水平空格字符。 So .split(/\\s+/) splits the input according to one or more space characters and .split(" ") splits the input according to a single space. 因此.split(/\\s+/)根据一个或多个空格字符拆分输入，而.split(" ")根据单个空格拆分输入。
Example: 例：
> "foo bar".split(/\s+/)
[ 'foo', 'bar' ]
> "foo bar".split(" ")
[ 'foo', '', '', 'bar' ]
解决方案2
9 已采纳 2015-01-24 17:08:50
The difference between .split(" ") and .split(/\\s+/) is: .split（“”）和.split（/ \\ s + /）之间的区别是：
The regex " " 正则表达式" "
- Match the space character literally. 从字面上匹配空间字符。
The regex /\\s+/ 正则表达式/\\s+/
- Match a single whitespacecharacter (tab, line feed, carriage return, vertical tab, form feed) between one and unlimmited times. 匹配单个空格字符（制表符，换行符，回车符，垂直制表符，换页符）在一个和无限时间之间。 (greedy) （贪婪）
Short: 短：
" " splits the array at one single space character. " "将数组拆分为一个单独的空格字符。
/\\s/ splits the array at every kind of whitespace character /\\s/在每种空格字符处拆分数组
+ Matches between one and unlimitted times +一次和无限时间之间的匹配
解决方案3
1 2015-01-24 16:51:11
\\s captures more types of whitespace than space \\s捕获比空间更多类型的空白
From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions : 来自https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions ：
Matches a single white space character, including space, tab, form feed, line feed. 匹配单个空格字符，包括空格，制表符，换页符，换行符。 Equivalent to [ \\f\\n\\r\\t\\v\ \ \\ \ \ \ \ \ \ \ \ \ \ \
\
\ \ \ ] . 相当于[ \\f\\n\\r\\t\\v\ \ \\ \ \ \ \ \ \ \ \ \ \ \
\
\ \ \ ] 。
Also the + means it will match on multiple spaces. 此外， +表示它将在多个空格上匹配。 So foo bar will produce a different result: 所以foo bar会产生不同的结果：
js> 'foo bar'.split(' ')
["foo", "", "", "", "", "", "bar"]
js> 'foo bar'.split(/\s+/)
["foo", "bar"]
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