blocks|key|876459|text|实际上，由于t.co+url缩短器的存在，仅仅计算字符已经不再起作用。看看这两个Twitter参考资料，看看如何处理缩短的链接：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|876460|https://support.twitter.com/articles/78124-how-to-shorten-links-urls|offset|length|876461|https://dev.twitter.com/docs/tco-url-wrapper/how-twitter-wrap-urls|876462|如果你正在寻找客户端的帮助，你必须通过twitter-text.js交一个新朋友|876463|https://github.com/twitter/twitter-text-js|876464|我还发布了一个函数的演练，该函数用于计算tweet中的剩余字符|876465|http://blog.pay4tweet.com/2012/04/27/twitter-lifts-140-character-limit/|876466|该函数如下所示|876467|function+charactersleft(tweet)+{
++++var+url,+i,+lenUrlArr;
++++var+virtualTweet+=+tweet;
++++var+filler+=+"01234567890123456789";
++++var+extractedUrls+=+twttr.txt.extractUrlsWithIndices(tweet);
++++var+remaining+=+140;
++++lenUrlArr+=+extractedUrls.length;
++++if+(+lenUrlArr+>+0+)+{
++++++++for+(var+i+=+0;+i+<+lenUrlArr;+i%2B%2B)+{
++++++++++++url+=+extractedUrls[i].url;
++++++++++++virtualTweet+=+virtualTweet.replace(url,filler);
++++++++}
++++}
++++remaining+=+remaining+-+virtualTweet.length;
++++return+remaining;
}|code-block|syntax|javascript|876468|该函数返回剩余的字符数，假设所有URL(包括那些缩短为少于20个字符的URL)都已被t.co“缩短”为19个字符加一个空格。|876469|它假设包含了twitter-text.js。|876470|entityMap|0|LINK|mutability|MUTABLE|url|1|2|3^0|0|0|1W|0|0|0|1U|1|0|0|0|16|2|0|0|0|1Z|3|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@$D|1C|E|1D|1|1E]]|A|$]]|$1|F|3|G|5|6|7|1F|8|@]|9|@$D|1G|E|1H|1|1I]]|A|$]]|$1|H|3|I|5|6|7|1J|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1K|8|@]|9|@$D|1L|E|1M|1|1N]]|A|$]]|$1|L|3|M|5|6|7|1O|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1P|8|@]|9|@$D|1Q|E|1R|1|1S]]|A|$]]|$1|P|3|Q|5|6|7|1T|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|1U|8|@]|9|@]|A|$U|V]]|$1|W|3|X|5|6|7|1V|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1W|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|C]]|17|$5|13|14|15|A|$16|G]]|18|$5|13|14|15|A|$16|K]]|19|$5|13|14|15|A|$16|O]]]]

Actually, because of the t.co url shortener, just counting characters doesn't work anymore. Check out these two Twitter references to see how to handle shortened links:

<a href="https://support.twitter.com/articles/78124-how-to-shorten-links-urls">https://support.twitter.com/articles/78124-how-to-shorten-links-urls</a>

<a href="https://dev.twitter.com/docs/tco-url-wrapper/how-twitter-wrap-urls">https://dev.twitter.com/docs/tco-url-wrapper/how-twitter-wrap-urls</a>

If you're looking for help on the client-side, you'll have to make a new friend with twitter-text.js

<a href="https://github.com/twitter/twitter-text-js">https://github.com/twitter/twitter-text-js</a>

I also posted a walk-through of a function I use to count the remaining characters in a tweet

<a href="http://blog.pay4tweet.com/2012/04/27/twitter-lifts-140-character-limit/">http://blog.pay4tweet.com/2012/04/27/twitter-lifts-140-character-limit/</a>

The function looks like this

<pre><code>function charactersleft(tweet) {
 var url, i, lenUrlArr;
 var virtualTweet = tweet;
 var filler = "01234567890123456789";
 var extractedUrls = twttr.txt.extractUrlsWithIndices(tweet);
 var remaining = 140;
 lenUrlArr = extractedUrls.length;
 if ( lenUrlArr &gt; 0 ) {
 for (var i = 0; i &lt; lenUrlArr; i++) {
 url = extractedUrls[i].url;
 virtualTweet = virtualTweet.replace(url,filler);
 }
 }
 remaining = remaining - virtualTweet.length;
 return remaining;
}
</code></pre>

The function returns the number of characters remaining, assuming that all URLs, including those shortened to less than 20 characters, have been "shortened" by t.co to 19 characters plus a space.

It assumes that twitter-text.js is being included.

blocks|key|876488|text|正如其他人提到的，twitter将链接计算为长度为20的字符串。在我们的小项目中，我们最终使用了以下代码片段：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|876489|function+getTweetLength(input)+{
++var+tmp+=+"";
++for(var+i+=+0;+i+<+20;+i%2B%2B){tmp%2B="o"}
++return+input.replace(/(http[s]?:\/\/[\S]*)/g,+tmp).length;
};|code-block|syntax|javascript|876490|如果你正在使用angular.js，这里有一个可以在你的angular.js应用中使用的小过滤器：|876491|app.filter('tweetLength',+function()+{
++return+function(input)+{
++++var+tmp+=+"";
++++for(var+i+=+0;+i+<+20;+i%2B%2B){tmp%2B="o"}
++++return+input.replace(/(http[s]?:\/\/[\S]*)/g,+tmp).length;
++};
});|876492|用法很简单，就像：|876493|Tweet+length+is+{{tweet%7CtweetLength}}|876494|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

As others mentioned, twitter counts links as a string with length of 20. In our small project we ended up using following code piece : 

<pre><code>function getTweetLength(input) {
 var tmp = "";
 for(var i = 0; i &lt; 20; i++){tmp+="o"}
 return input.replace(/(http[s]?:\/\/[\S]*)/g, tmp).length;
};
</code></pre>

In case you are using angular.js, here is a small filter you can use in your angular.js app:

<pre><code>app.filter('tweetLength', function() {
 return function(input) {
 var tmp = "";
 for(var i = 0; i &lt; 20; i++){tmp+="o"}
 return input.replace(/(http[s]?:\/\/[\S]*)/g, tmp).length;
 };
});
</code></pre>

And usage is as simple as :

<pre><code>Tweet length is {{tweet|tweetLength}}
</code></pre>

From the Twitter API docs ( <a href="http://dev.twitter.com/pages/counting_characters" rel="noreferrer">http://dev.twitter.com/pages/counting_characters</a> ):

the 140 chars tweet limit doesn't really count the characters but rather the bytes of the string.

How would I be able to count the bytes in a string using Javascript or does every character in my string always use 2 bytes since I set the encoding of my page to UTF-8?

Perhaps there is already a nice counter function for me to use?

Best way to count characters in Javascript for a tweet

从Twitter API文档(  )：140个字符的tweet限制并不真正计算字符，而是字符串的字节数。我如何才能使用Javascript计算字符串中的字节数，还是因为我将页面的编码设置为UTF-8，所以字符串中的每个字符都使用2个字节？也许已经有一个很好的计数器函数可供我使用了？

问在Javascript中计算推文字符数的最佳方法
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