blocks|key|4452796|text|Javascript字符串具有长度属性。您可以简单地遍历字符：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4452797|for(var+i+=+0;+i+<+str.length;+i%2B%2B)+{
++++var+char+=+str[i],
+++++++code+=+str.charCodeAt(i);
}|code-block|syntax|javascript|4452798|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|$]]

A Javascript string has a length property. You can iterate over the characters simply:

<pre><code>for(var i = 0; i &lt; str.length; i++) {
 var char = str[i],
 code = str.charCodeAt(i);
}
</code></pre>

blocks|key|4452678|text|UTF-8是一种编码！JavaScript字符串使用UTF16进行(mostly)编码。只有当你在一个不支持ES6的String.fromCodePoint的环境中工作时，编码才是重要的。使用ES6从代码点获取字符串：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4452679|var+s+=+String.fromCodePoint(codePoint);|code-block|syntax|javascript|4452680|在没有ES6的情况下，对字符U%2B10000和更高版本使用UTF-16+surrogate+pair：|4452681|var+s;

if+(codePoint+<+0x10000)+{
++++s+=+String.fromCharCode(codePoint);
}+else+{
++++var+offset+=+codePoint+-+0x10000;
++++s+=+String.fromCharCode(0xd800+%2B+(offset+>>+10),
++++++++++++++++++++++++++++0xdc00+%2B+(offset+&+0x3ff));
}|4452682|码点的范围从U%2B0000到U%2B10FFFF+(1 114+Unicode+112值)，但并不是该范围内的所有字符都是有效的 字符。您可以从http://www.unicode.org/Public/8.0.0/ucd/UnicodeData.txt获取一个表，并提取您真正想要遍历的字符。|4452683|entityMap|0|LINK|mutability|MUTABLE|url|https://mathiasbynens.be/notes/javascript-encoding|1|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint|2|https://en.wikipedia.org/wiki/UTF-16#U.2B10000_to_U.2B10FFFF|3|http://www.unicode.org/Public/8.0.0/ucd/UnicodeData.txt^0|1M|K|X|8|0|1M|K|1|0|0|Z|E|2|0|0|1X|1J|3|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]|$9|1A|A|1B|1|1C]]|E|$]]|$1|F|3|G|5|H|7|1D|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1E|8|@]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|M|3|N|5|H|7|1I|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1J|8|@]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|Q|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]|Y|$5|T|U|V|E|$W|Z]]|10|$5|T|U|V|E|$W|11]]|12|$5|T|U|V|E|$W|13]]]]

UTF-8 is an encoding! JavaScript strings are <a href="https://mathiasbynens.be/notes/javascript-encoding" rel="noreferrer">(mostly)</a> encoded in UTF-16. Encoding is only important if you’re working in an environment that doesn’t support ES6’s <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint" rel="noreferrer"><code>String.fromCodePoint</code></a>. Getting a string from a codepoint with ES6:

<pre><code>var s = String.fromCodePoint(codePoint);
</code></pre>

and without ES6, using a UTF-16 <a href="https://en.wikipedia.org/wiki/UTF-16#U.2B10000_to_U.2B10FFFF" rel="noreferrer">surrogate pair</a> for characters U+10000 and onwards:

<pre><code>var s;

if (codePoint &lt; 0x10000) {
 s = String.fromCharCode(codePoint);
} else {
 var offset = codePoint - 0x10000;
 s = String.fromCharCode(0xd800 + (offset &gt;&gt; 10),
 0xdc00 + (offset &amp; 0x3ff));
}
</code></pre>

Codepoints range from U+0000 to U+10FFFF (1&thinsp;114&thinsp;112 values), but not everything that range is a valid Unicode character. You can get a table from <a href="http://www.unicode.org/Public/8.0.0/ucd/UnicodeData.txt" rel="noreferrer">http://www.unicode.org/Public/8.0.0/ucd/UnicodeData.txt</a> and extract the characters you really want to iterate over.

blocks|key|4452871|text|我认为这可能确切地定义了要迭代的内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4452872|​|4452873|📷|atomic|offset|length|4452874|4452875|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/4fa7f54278f5e9dc7cb5297e413184ee.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

I think this might define what to iterate over exactly:

<a href="https://en.wikipedia.org/wiki/Unicode" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4msQ3.png" alt="enter image description here"></a>

blocks|key|4452917|text|(添加此答案是因为与某些Google搜索相关)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4452918|在可能包含UTF-8多码点字符(即表情符号或非拉丁字母)的字符串上逐个字符迭代的正确方法是Array.from()|offset|length|style|CODE|4452919|const+bugs+=+''

//+WRONG,+does+not+account+for+characters+with+>+2+Unicode+code+points
bugs.split('')
//+Array(6)+[+"\ud83d",+"\udc1b",+"\ud83d",+"\udc1b",+"\ud83d",+"\udc1b"+]

//+CORRECT
Array.from(bugs)
//+Array(3)+[+"",+"",+""+]|code-block|syntax|javascript|4452920|然后，像你可以迭代任何普通数组一样进行迭代(建议：map/forEach)。|4452921|更多信息：https://medium.com/@giltayar/iterating-over-emoji-characters-the-es6-way-f06e4589516|4452922|entityMap|0|LINK|mutability|MUTABLE|url|https://medium.com/@giltayar/iterating-over-emoji-characters-the-es6-way-f06e4589516^0|0|19|C|0|0|P|3|T|7|0|5|2C|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|13|8|@$D|14|E|15|F|G]|$D|16|E|17|F|G]]|9|@]|A|$]]|$1|O|3|P|5|6|7|18|8|@]|9|@$D|19|E|1A|1|1B]]|A|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

(Adding this answer because relevant for some Google searches)
The correct way to iterate character by character over a string that may contain UTF-8 multi-codepoint characters (i.e. emojis or non-latin alphabets) is <code>Array.from()</code>:
<pre class="lang-js prettyprint-override"><code>const bugs = ''

// WRONG, does not account for characters with &gt; 2 Unicode code points
bugs.split('')
// Array(6) [ &quot;\ud83d&quot;, &quot;\udc1b&quot;, &quot;\ud83d&quot;, &quot;\udc1b&quot;, &quot;\ud83d&quot;, &quot;\udc1b&quot; ]

// CORRECT
Array.from(bugs)
// Array(3) [ &quot;&quot;, &quot;&quot;, &quot;&quot; ]
</code></pre>
Then, iterate as you may iterate any normal array (suggested: <code>map</code>/<code>forEach</code>).
More information: <a href="https://medium.com/@giltayar/iterating-over-emoji-characters-the-es6-way-f06e4589516" rel="nofollow noreferrer">https://medium.com/@giltayar/iterating-over-emoji-characters-the-es6-way-f06e4589516</a>

Is it possible to iterate over all Unicode characters (UTF-8)? Thanks!
I've tried using:

<pre><code>character = String.fromCharCode(i);
</code></pre>

But I'm not sure how to implement it.

How to iterate over over all Unicode characters?

是否可以遍历所有Unicode字符(UTF-8)？谢谢!我试过使用：character = String.fromCharCode(i);但我不确定如何实现它。

问如何遍历所有Unicode字符？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何遍历所有Unicode字符？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何遍历所有Unicode字符？
EN