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Detailed introduction to space character entities in html

零下一度

Jul 26, 2017 pm 03:50 PM

htmlentitydetailed

HTML 实体

在 HTML 中，某些字符是预留的。

在 HTML 中不能使用小于号（），这是因为浏览器会误认为它们是标签。

如果希望正确地显示预留字符，我们必须在 HTML 源代码中使用字符实体（character entities）。

字符实体类似这样：

&entity_name;
或者
entity_number;

如需显示小于号，我们必须这样写：< 或 <

提示：使用实体名而不是数字的好处是，名称易于记忆。不过坏处是，浏览器也许并不支持所有实体名称（对实体数字的支持却很好）。

不间断空格（non-breaking space）字符编码：在HTML中，按下space键产生，空格不累加（只算1个）,要使用html实体表示才可累加。

全角空格（Em Space）字符编码：em是字体排印学的计量单位。相当于当前指定的点数，如1em在16px的字体中就是16px。此空格有个相当稳健的特性，其占据的宽度正好是1个中文宽度。

半角空格（En Space）字符编码：en是字体排印学的计量单位。为em宽度的一半，如1en在16px的字体中就是16px，名义上是小写字母n的宽度。此空格有个相当稳健的特性，其占据的宽度正好是1/2个中文宽度。

窄空格（Thin Space）占据的宽度比较小，它是em之六分之一宽。

`‌`

零宽不连字（Zero Width Non Joiner）字符编码‌：简称“ZWNJ”，是一个不打印字符，放在电子文本的两个字符之间，抑制本来会发生的连字，而是以这两个字符原本的字形来绘制。HTML字符值‌。

`‍`

零宽连字（Zero Width Joiner）字符编码‍：简称“ZWJ”，是一个不打印字符，放在某些需要复杂排版语言（如阿拉伯语、印地语）的两个字符之间，使得这两个本不会发生连字的字符产生了连字效果。HTML字符值‍。

其它：

浏览器还会把以下字符当作空白进行解析：空格、制表位、换行和回车还有　等等。
+16进制/十进制表示是 Numeric Character References
&+实体名表示是 Character Entities References，html字符实体的名字必须是在html中已经定义的才能被使用。
使用实体名而不是数字的好处是，名称易于记忆。坏处是，浏览器也许并不支持所有实体名称（对实体数字的支持却很好）。
实体名称对大小写敏感。

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