【轉(zhuǎn)】HTML中常見形如number;的東西叫做 字符實(shí)體引用，簡稱引用，代表一個(gè)對(duì)應(yīng)的unicode字符

英文解釋的很清楚，就不翻譯了，自己看：

Entities

Character entity references, or entities for short, provide a method of entering characters that cannot be expressed in the document’s character encoding or that cannot easily be entered on a keyboard. Entities are case-sensitive and take the form &name;. Examples of entities include ? for the copyright symbol and Α for the Greek capital letter alpha.

In addition to entities, authors can use numeric character references. While entities are limited to a subset of Unicode characters, numeric character references can specify any character. Numeric character references may be given in decimal or hexadecimal, though browser support is stronger for decimal references. Decimal references are of the form number; while hexadecimal references take the case-insensitive form number;. Examples of numeric character references include ? or ? for the copyright symbol, Α or Α for the Greek capital letter alpha, and ? or ? for the Arabic letter alef.

The following documents feature tables of the character entity references in HTML 4, along with the numeric character reference in decimal and hexadecimal. A rendering of each character reference is provided so that users may check their browsers’ compliance.

下面這幾個(gè)鏈接，包括了對(duì)應(yīng)的那些字符所對(duì)應(yīng)的實(shí)體引用：

下面摘錄一些常見的：Character< xmlnamespace prefix ="o" ns ="urn:schemas-microsoft-com:office:office" />EntityDecimalHexRendering in Your Browser

EntityDecimalHex

no-break space = non-breaking space???

cent sign￠￠￠???

pound sign￡￡￡???

currency sign¤¤¤¤¤¤

yen sign = yuan sign￥￥￥???

section sign§§§§§§

diaeresis = spacing diaeresis¨¨¨¨¨¨

copyright sign??????

registered sign = registered trade mark sign??????

degree sign°°°°°°

plus-minus sign = plus-or-minus sign±±±±±±

acute accent = spacing acute′′′???

micro signμμμ???

pilcrow sign = paragraph sign??????

middle dot = Georgian comma = Greek middle dot······

masculine ordinal indicatorooo???

right-pointing double angle quotation mark = right pointing guillemet??????

vulgar fraction one quarter = fraction one quarter??????

vulgar fraction one half = fraction one half??????

vulgar fraction three quarters = fraction three quarters??????

inverted question mark = turned question mark??????

multiplication sign××××××

Latin capital letter O with stroke = Latin capital letter O slash??????

Latin small letter sharp s = ess-zed??????

division sign÷÷÷÷÷÷

Latin small letter o with stroke = Latin small letter o slash??????

quotation mark = APL quote"""“““

ampersand&&&&&&

less-than sign<<<<<<

greater-than sign>>>>>>

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