blocks|key|1239470|text|下面是我使用的函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1239471|function+trim(s){+
++return+(+s+%7C%7C+''+).replace(+/%5E\s%2B%7C\s%2B$/g,+''+);+
}|code-block|syntax|javascript|1239472|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's the function I use.

<pre><code>function trim(s){ 
 return ( s || '' ).replace( /^\s+|\s+$/g, '' ); 
}
</code></pre>

blocks|key|1454465|text|Steven+Levithan曾经写过关于如何实现Faster+JavaScript+Trim的文章。这绝对值得一看。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1454466|entityMap|0|LINK|mutability|MUTABLE|url|http://blog.stevenlevithan.com/about|1|http://blog.stevenlevithan.com/archives/faster-trim-javascript^0|0|F|0|P|M|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

<a href="http://blog.stevenlevithan.com/about" rel="noreferrer">Steven Levithan</a> once wrote about how to implement a <a href="http://blog.stevenlevithan.com/archives/faster-trim-javascript" rel="noreferrer">Faster JavaScript Trim</a>. It’s definitely worth a look.

blocks|key|1239581|text|如果不是编写新的代码来修剪字符串，而是查看调用"strip()“的现有代码，并想知道为什么它不能工作，那么您可能希望检查它是否试图包含一些类似于prototypejs框架的东西，并确保它确实被加载了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1239582|该框架为所有字符串对象添加了一个条带函数，但是如果你升级了它，而你的网页仍然引用旧的.js文件，那么它当然不会起作用。|1239583|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

If, rather than writing new code to trim a string, you're looking at existing code that calls "strip()" and wondering why it isn't working, you might want to check whether it attempts to include something like the prototypejs framework, and make sure it's actually getting loaded. 
That framework adds a strip function to all String objects, but if e.g. you upgraded it and your web pages are still referring to the old .js file it'll of course not work.

blocks|key|1454556|text|对于jquery用户，$.trim(s)怎么样？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1454557|entityMap^0|B|9|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

For jquery users, how about <code>$.trim(s)</code>

blocks|key|1239666|text|如果你已经在使用jQuery，那么你可能想看看jQuery已经提供的jQuery.trim()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1239667|entityMap|0|LINK|mutability|MUTABLE|url|http://api.jquery.com/jQuery.trim/^0|Y|D|Y|D|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

If you're already using jQuery, then you may want to have a look at <a href="http://api.jquery.com/jQuery.trim/" rel="nofollow"><code>jQuery.trim()</code></a> which is already provided with jQuery.

blocks|key|1239732|text|支持去除BOM和NBSP的来自MDN的更好的填充|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1239733|if+(!String.prototype.trim)+{
++String.prototype.trim+=+function+()+{
++++return+this.replace(/%5E[\s\uFEFF\xA0]%2B%7C[\s\uFEFF\xA0]%2B$/g,+'');
++};
}|code-block|syntax|javascript|1239734|请记住，修改内置原型会影响性能(由于JS引擎依赖于许多运行时优化)，并且在性能关键的情况下，您可能需要考虑定义myTrimFunction(string)的替代方案。也就是说，如果您的目标是没有原生.trim()支持的旧环境，您可能会有更重要的性能问题需要处理。|style|CODE|1239735|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Byte_order_mark|1|https://en.wikipedia.org/wiki/Non-breaking_space|2|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim^0|4|3|0|8|4|1|F|3|2|0|0|1J|M|2R|7|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]|$A|12|B|13|1|14]|$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|F|7|18|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|19|8|@$A|1A|B|1B|K|L]|$A|1C|B|1D|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]|W|$5|P|Q|R|C|$S|X]]]]

A better polyfill from the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim" rel="nofollow noreferrer">MDN</a> that supports removal of <a href="https://en.wikipedia.org/wiki/Byte_order_mark" rel="nofollow noreferrer">BOM</a> and <a href="https://en.wikipedia.org/wiki/Non-breaking_space" rel="nofollow noreferrer">NBSP</a>:

<pre class="lang-js prettyprint-override"><code>if (!String.prototype.trim) {
 String.prototype.trim = function () {
 return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
 };
}
</code></pre>

Bear in mind that modifying built-in prototypes comes with a performance hit (due to the JS engine bailing on a number of runtime optimizations), and in performance critical situations you may need to consider the alternative of defining <code>myTrimFunction(string)</code> instead. That being said, if you are targeting an older environment without native <code>.trim()</code> support, you are likely to have more important performance issues to deal with.

What's a clean and efficient JavaScript implementation to strip leading and trailing spaces from a string? 

For example:

<code>" dog"</code>

<code>"dog "</code>

<code>" dog "</code>

<code>" dog "</code>

all get turned into

<code>"dog"</code>

String strip() for JavaScript?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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从字符串中去掉前导空格和尾随空格的干净高效的JavaScript实现是什么？例如：" dog""dog "" dog ""           dog "所有的一切都变成了"dog"

问JavaScript的字符串条()？
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