blocks|key|179237|text|字符的表示方式由渲染器决定，但服务器也可能在发送文档之前去掉某些字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|179238|您还可以通过使用Unicode+character+ZERO+WIDTH+NON-JOINER+(U%2B200C)或&zwnj;来制作无标题的YouTube视频，如https://www.youtube.com/watch?v=dmBvw8uPbrA。下面的代码块应该包含该字符：|offset|length|style|CODE|179239|‌‌+|code-block|syntax|javascript|179240|entityMap|0|LINK|mutability|MUTABLE|url|http://www.fileformat.info/info/unicode/char/200c/index.htm|1|https://www.youtube.com/watch?v=dmBvw8uPbrA^0|0|1L|6|Q|U|0|29|17|1|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@$D|10|E|11|1|12]|$D|13|E|14|1|15]]|A|$]]|$1|H|3|I|5|J|7|16|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]|U|$5|P|Q|R|A|$S|V]]]]

How a character is represented is up to the renderer, but the server may also strip out certain characters before sending the document.

You can also have untitled YouTube videos like <a href="https://www.youtube.com/watch?v=dmBvw8uPbrA" rel="noreferrer">https://www.youtube.com/watch?v=dmBvw8uPbrA</a> by using the Unicode character <a href="http://www.fileformat.info/info/unicode/char/200c/index.htm" rel="noreferrer">ZERO WIDTH NON-JOINER (U+200C)</a>, or <code>&amp;zwnj;</code> in HTML. The code block below should contain that character:

<pre><code>‌‌ 
</code></pre>

blocks|key|179273|text|实际上有一个真正看不见的角色：U%2BFEFF。此字符称为字节顺序标记，与Unicode+8系统相关。这是一个非常令人困惑的概念，可以解释为字节顺序标记或简称BOM，它是一个看不见的字符，不占用任何空间。您可以在>和<之间复制下面的字符。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|179274|人物是这样的：|179275|179276|+<|blockquote|179277|179278|如何在行动中捕捉这个角色：|179279|179280|复制>和<之间的字符，|unordered-list-item|179281|编写一行文本，然后在文本行中随机插入插入符号|179282|粘贴该行中的字符。|179283|转到行首并按住向右箭头键。|179284|179285|您将注意到，当您的插入符号到达您粘贴字符的位置时，它将短暂停止约半秒。这是因为插入符号越过了不可见的字符。即使你看不见它，并不意味着它不在那里。插入符号仍然看到您粘贴BOM的区域中有一个字符，并将通过它。由于BOM是不可变的，插入符号将看起来像是暂停了片刻。您可以在一个区域中多次经过BOM，然后重新执行上述步骤以真正显示效果。祝好运!|179286|编辑:遗憾的是，Stackoverflow不喜欢这个角色。下面是来自w3.org：https://www.w3.org/International/questions/examples/phpbomtest.php的一个示例|179287|entityMap|0|LINK|mutability|MUTABLE|url|https://www.w3.org/International/questions/examples/phpbomtest.php^0|F|6|25|3|2W|1|2Y|1|0|0|0|0|0|0|0|2|1|4|1|0|0|0|0|0|0|15|1U|0|0^^$0|@$1|2|3|4|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1K|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|1L|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|1M|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1O|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|1Q|8|@$9|1R|A|1S|B|C]|$9|1T|A|1U|B|C]]|D|@]|E|$]]|$1|S|3|T|5|R|7|1V|8|@]|D|@]|E|$]]|$1|U|3|V|5|R|7|1W|8|@]|D|@]|E|$]]|$1|W|3|X|5|R|7|1X|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|Z|3|10|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|11|3|12|5|6|7|20|8|@]|D|@$9|21|A|22|1|23]]|E|$]]|$1|13|3|-4|5|6|7|24|8|@]|D|@]|E|$]]]|14|$15|$5|16|17|18|E|$19|1A]]]]

There is actually a truly invisible character: <code>U+FEFF</code>.
This character is called the Byte Order Mark and is related to the Unicode 8 system. It is a really confusing concept that can be explained <a href="https://stackoverflow.com/questions/689185/json-decode-returns-null-after-webservice-call/689237#689237">HERE</a> The Byte Order Mark or <code>BOM</code> for short is an invisible character that doesn't take up any space. You can copy the character bellow between the <code>&gt;</code> and <code>&lt;</code>.
Here is the character:
<blockquote>
&gt; &lt;
</blockquote>
How to catch this character in action:
<ul>
<li>Copy the character between the <code>&gt;</code> and <code>&lt;</code>,</li>
<li>Write a line of text, then randomly put your caret in the line of text</li>
<li>Paste the character in the line.</li>
<li>Go to the beginning of the line and press and hold the right arrow key.</li>
</ul>
You will notice that when your caret gets to the place you pasted the character, it will briefly stop for around half a second. This is becuase the caret is passing over the invisible character. Even though you can't see it doesn't mean it isn't there. The caret still sees that there is a character in that area that you pasted the BOM and will pass through it. Since the BOM is invisble, the caret will look like it has paused for a brief moment. You can past the BOM multiple times in an area and redo the steps above to really show the affect. Good luck!
EDIT: Sadly, Stackoverflow doesn't like the character. Here is an example from w3.org: <a href="https://www.w3.org/International/questions/examples/phpbomtest.php" rel="nofollow noreferrer">https://www.w3.org/International/questions/examples/phpbomtest.php</a>

blocks|key|180747|text|不可见字符为​或U%2B200b|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|180748|​|code-block|syntax|javascript|180749|entityMap^0|6|1|8|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

An invisible Character is <code>​</code>, or <code>U+200b</code>
<pre><code>​
</code></pre>

blocks|key|183336|text|其他答案是正确的-字符是否不可见取决于您使用的字体。对我来说，这似乎是一个很好的列表，列出了真正看不见的字符(甚至连空格都没有)。它包含其他列表中缺少的一些字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|183337|'\u2060',+//+Word+Joiner
'\u2061',+//+FUNCTION+APPLICATION
'\u2062',+//+INVISIBLE+TIMES
'\u2063',+//+INVISIBLE+SEPARATOR
'\u2064',+//+INVISIBLE+PLUS
'\u2066',+//+LEFT+-+TO+-+RIGHT+ISOLATE
'\u2067',+//+RIGHT+-+TO+-+LEFT+ISOLATE
'\u2068',+//+FIRST+STRONG+ISOLATE
'\u2069',+//+POP+DIRECTIONAL+ISOLATE
'\u206A',+//+INHIBIT+SYMMETRIC+SWAPPING
'\u206B',+//+ACTIVATE+SYMMETRIC+SWAPPING
'\u206C',+//+INHIBIT+ARABIC+FORM+SHAPING
'\u206D',+//+ACTIVATE+ARABIC+FORM+SHAPING
'\u206E',+//+NATIONAL+DIGIT+SHAPES
'\u206F',+//+NOMINAL+DIGIT+SHAPES
'\u200B',+//+Zero-Width+Space
'\u200C',+//+Zero+Width+Non-Joiner
'\u200D',+//+Zero+Width+Joiner
'\u200E',+//+Left-To-Right+Mark
'\u200F',+//+Right-To-Left+Mark
'\u061C',+//+Arabic+Letter+Mark
'\uFEFF',+//+Byte+Order+Mark
'\u180E',+//+Mongolian+Vowel+Separator
'\u00AD'++//+soft-hyphen|code-block|syntax|javascript|183338|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|$]]

Other answers are correct - whether a character is invisible or not depends on what font you use. This seems to be a pretty good list to me of characters that are truly invisible (not even space). It contains some chars that the other lists are missing.
<pre><code>'\u2060', // Word Joiner
'\u2061', // FUNCTION APPLICATION
'\u2062', // INVISIBLE TIMES
'\u2063', // INVISIBLE SEPARATOR
'\u2064', // INVISIBLE PLUS
'\u2066', // LEFT - TO - RIGHT ISOLATE
'\u2067', // RIGHT - TO - LEFT ISOLATE
'\u2068', // FIRST STRONG ISOLATE
'\u2069', // POP DIRECTIONAL ISOLATE
'\u206A', // INHIBIT SYMMETRIC SWAPPING
'\u206B', // ACTIVATE SYMMETRIC SWAPPING
'\u206C', // INHIBIT ARABIC FORM SHAPING
'\u206D', // ACTIVATE ARABIC FORM SHAPING
'\u206E', // NATIONAL DIGIT SHAPES
'\u206F', // NOMINAL DIGIT SHAPES
'\u200B', // Zero-Width Space
'\u200C', // Zero Width Non-Joiner
'\u200D', // Zero Width Joiner
'\u200E', // Left-To-Right Mark
'\u200F', // Right-To-Left Mark
'\u061C', // Arabic Letter Mark
'\uFEFF', // Byte Order Mark
'\u180E', // Mongolian Vowel Separator
'\u00AD' // soft-hyphen
</code></pre>

Are there any invisible characters? I have checked Google for invisible characters and ended up with many answers but I'm not sure about those. Can someone on Stack Overflow tell me more about this?

Also I have checked a profile on Facebook and found that the user didn't have any name to his profile? How can this be possible? Is it some database issue? Hacking or something?

When I searched over Internet, I found that <code>200D</code> is an ASCII value with an invisible character. Is it true?

Invisible characters - ASCII

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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是否有任何不可见的字符？我在谷歌上搜索看不见的字符，最后得到了很多答案，但我对这些答案不确定。Stack Overflow上的人能告诉我更多关于这方面的信息吗？另外，我检查了Facebook上的个人资料，发现该用户的个人资料中没有任何名称？这怎么可能呢？是不是有什么数据库问题？黑客之类的？当我在互联网上搜索时，我发现2...

问不可见字符- ASCII
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