blocks|key|4491578|text|YouTube+pageToken的长度为六个字符。以下是我对该格式所能确定的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4491579|char+1:我见过的总是'C‘。char+2-3:编码的起始位置char+4-5:我看到的总是'QA‘。char+6：'A‘表示列表项的位置大于或等于起始位置。“q”表示起始位置之前的列表项。|4491580|由于字符6的性质，有两种不同的方式来表示同一页。给定maxResults=1，可以通过将页面标记设置为"CAEQAA“或"CAIQAQ”来访问页面2。第一个表示从结果编号2(由字符2-3“AE”表示)开始，并列出1个项目。第二个表示返回结果编号3之前的一项(由字符2-3+"AI“表示)。|4491581|字符2-3是一种奇怪的16进制编码。|4491582|字符3使用A+-Z中的列表，然后是a-z，然后是0-9，列表中的增量为4。该序列为A、E、I、M、Q、U、Y、c、g、k、o、s、w、0、4、8。字符2从A到B再到C到D，依此类推。出于我的目的，我不会处理大的结果集，所以我没有费心去看第二个字符在几百个结果之外会发生什么。也许有人使用更大的集合将提供更新，关于角色2在那之后如何表现。|4491583|由于该字符串仅包含起始位置和">=“或"<”选项，因此同一字符串可用于多种情况。例如，每页有2个结果，第二页的开始位置是结果3，其pageToken是"CAIQAA“。这与第三个页面的令牌相同，每个页面一个结果。|4491584|由于我主要是php用户，下面是我用来获取给定页面的pageToken的函数：|4491585|function+token($limit,+$page)+{
++++$start+=+1+%2B+($page+-+1)+*+$limit;
++++$third_chars+=+array_merge(
++++++++++++range("A","Z",4),
++++++++++++range("c","z",4),
++++++++++++range(0,9,4));
++++return+'C'.
+++++++++++chr(ord('A')+%2B+floor($start+/+16)).
+++++++++++$third_chars[($start+%25+16)+-+1].
+++++++++++'QAA';
}
$limit+=+1;
echo+"With+$limit+result(s)+per+page...".PHP_EOL;
for+($i+=+1;+$i+<+6;+%2B%2B$i)+{
++++echo+"The+token+for+page+$i+is+".token($limit,+$i).PHP_EOL;
}|code-block|syntax|javascript|4491586|请在你的项目中测试这个函数，如果你发现一个缺陷或增强，请更新我们的其余部分，因为YouTube没有为我们提供一个简单的方法来做到这一点。|4491587|编辑:+YouTube接口v3的页面令牌序列已更改，该系统将不再工作。有关最新的和工作页面标记的示例，请参阅this+page。|offset|length|4491588|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/thomas-xin/Miza/blob/dabf27408effa1d5a44e09f73b1ad7dddc2a1452/misc/page_tokens.txt^0|0|0|0|0|0|0|0|0|0|1I|9|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|19|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1B|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1C|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1D|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1E|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1F|8|@]|9|@$W|1G|X|1H|1|1I]]|A|$]]|$1|Y|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

A YouTube pageToken is six characters long. Here's what I've been able to determine about the format:
char 1: Always 'C' that I've seen.
char 2-3: Encoded start position
char 4-5: Always 'QA' that I've seen.
char 6: 'A' means list items in a position greater than or equal to the start position. 'Q' means list items before the start position.
Due to the nature of character 6, there are two different ways to represent the same page. Given maxResults=1, page 2 can be reached by setting the page token to either &quot;CAEQAA&quot; or &quot;CAIQAQ&quot;. The first one means to start at result number 2 (represented by characters 2-3 &quot;AE&quot;) and list 1 item. The second means to return one item before result number 3 (represented by characters 2-3 &quot;AI&quot;.
Characters 2-3 are a strange base 16 encoding.
Character 3 uses a list from A-Z, then a-z, then 0-9 and increments by 4 in the list for each increase of 1. The series is A,E,I,M,Q,U,Y,c,g,k,o,s,w,0,4,8. Character 2 goes from A to B to C to D and so on. For my purposes, I'm not working with large result sets, so I haven't bothered to see what happens to the second character beyond a couple hundred results. Perhaps someone working with larger sets will provide an update as to how character 2 behaves after that.
Since the string only contains a start position and an option for &quot;&gt;=&quot; or &quot;&lt;&quot;, the same string is used in multiple cases. For instance, with 2 results per page, the start position of the second page is result 3. The pageToken for this is &quot;CAIQAA&quot;. This is identical to the token for the third page with one result per page.
Since I'm primarily a php person, here's the function I'm using to get the pageToken for a given page:
<pre><code>function token($limit, $page) {
 $start = 1 + ($page - 1) * $limit;
 $third_chars = array_merge(
 range(&quot;A&quot;,&quot;Z&quot;,4),
 range(&quot;c&quot;,&quot;z&quot;,4),
 range(0,9,4));
 return 'C'.
 chr(ord('A') + floor($start / 16)).
 $third_chars[($start % 16) - 1].
 'QAA';
}
$limit = 1;
echo &quot;With $limit result(s) per page...&quot;.PHP_EOL;
for ($i = 1; $i &lt; 6; ++$i) {
 echo &quot;The token for page $i is &quot;.token($limit, $i).PHP_EOL;
}
</code></pre>
Please test this function in your project and update the rest of us if you find a flaw or an enhancement since YouTube hasn't provided us with an easy way to do this.
Edit: The page token sequence for YouTube API v3 has been changed, and this system will no longer work. For an example of the most up-to-date and working page tokens, see <a href="https://github.com/thomas-xin/Miza/blob/dabf27408effa1d5a44e09f73b1ad7dddc2a1452/misc/page_tokens.txt" rel="nofollow noreferrer">this page</a>.

Another question on SO revealed that pageTokens are identical for different searches, provided that the page number and maxResults settings are the same. 

Version 2 of the API let you go to any arbitrary page by setting a start position, but v3 only provides next and previous tokens. There's no jumping from page 1 to page 5, even if you know there are 5 pages of results. 

So how do we work around this?

Youtube Data API v3 pageToken for arbitrary page

上的另一个问题显示，如果页码和maxResults设置相同，则不同搜索的pageTokens是相同的。版本2允许您通过设置开始位置转到任意页面，但v3只提供下一个和前一个令牌。即使你知道有5页的结果，也不会从第1页跳到第5页。那么我们该如何解决这个问题呢？

问适用于任意页面的Youtube Data API v3 pageToken
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