有些字符在HTML里有特别的含义，比如小于号<就表示HTML Tag的开始，这个小于号是不显示在我们最终看到的网页里的。那如果我们希望在网页中显示一个小于号，该怎么办呢？
这就要说到HTML字符实体(HTML Character Entities)了。
一个字符实体(Character Entity)分成三部分：第一部分是一个&符号，英文叫ampersand；第二部分是实体(Entity)名字或者是#加上实体(Entity)编号；第三部分是一个分号。
比如，要显示小于号，就可以写<或者<。
用实体(Entity)名字的好处是比较好理解，一看lt，大概就猜出是less than的意思，但是其劣势在于并不是所有的浏览器都支持最新的Entity名字。而实体(Entity)编号，各种浏览器都能处理。
注意：Entity是区分大小写的。
| 字符 | 十进制字符编号 | 实体名字 | 说明 |
| — | � | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — | 	 | — | 制表符Horizontal tab |
| — | | — | 换行Line feed |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — | | — | 回车Carriage Return |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
| — |  | — | 未使用Unused |
|   | — | Space | |
| ! | ! | — | 惊叹号Exclamation mark |
| “ | " | " | 双引号Quotation mark |
| # | # | — | 数字标志Number sign |
| $ | $ | — | 美元标志Dollar sign |
| % | % | — | 百分号Percent sign |
| & | & | & | Ampersand |
| ‘ | ' | — | 单引号Apostrophe |
| ( | ( | — | 小括号左边部分Left parenthesis |
| ) | ) | — | 小括号右边部分Right parenthesis |
| * | * | — | 星号Asterisk |
| + | + | — | 加号Plus sign |
| , | , | — | 逗号Comma |
| – | - | — | 连字号Hyphen |
| . | . | — | 句号Period (fullstop) |
| / | / | — | 斜杠Solidus (slash) |
| 0 | 0 | — | 数字0 Digit 0 |
| 1 | 1 | — | 数字1 Digit 1 |
| 2 | 2 | — | 数字2 Digit 2 |
| 3 | 3 | — | 数字3 Digit 3 |
| 4 | 4 | — | 数字4 Digit 4 |
| 5 | 5 | — | 数字5 Digit 5 |
| 6 | 6 | — | 数字6 Digit 6 |
| 7 | 7 | — | 数字7 Digit 7 |
| 8 | 8 | — | 数字8 Digit 8 |
| 9 | 9 | — | 数字9 Digit 9 |
| : | : | — | 冒号Colon |
| ; | ; | — | 分号Semicolon |
| < | < | < | 小于号Less than |
| = | = | — | 等于符号Equals sign |
| > | > | > | 大于号Greater than |
| ? | ? | — | 问号Question mark |
| @ | @ | — | Commercial at |
| A | A | — | 大写A Capital A |
| B | B | — | 大写B Capital B |
| C | C | — | 大写C Capital C |
| D | D | — | 大写D Capital D |
| E | E | — | 大写E Capital E |
| F | F | — | 大写F Capital F |
| G | G | — | 大写G Capital G |
| H | H | — | 大写H Capital H |
| I | I | — | 大写J Capital I |
| J | J | — | 大写K Capital J |
| K | K | — | 大写L Capital K |
| L | L | — | 大写K Capital L |
| M | M | — | 大写M Capital M |
| N | N | — | 大写N Capital N |
| O | O | — | 大写O Capital O |
| P | P | — | 大写P Capital P |
| Q | Q | — | 大写Q Capital Q |
| R | R | — | 大写R Capital R |
| S | S | — | 大写S Capital S |
| T | T | — | 大写T Capital T |
| U | U | — | 大写U Capital U |
| V | V | — | 大写V Capital V |
| W | W | — | 大写W Capital W |
| X | X | — | 大写X Capital X |
| Y | Y | — | 大写Y Capital Y |
| Z | Z | — | 大写Z Capital Z |
| [ | [ | — | 中括号左边部分Left square bracket |
| \ | \ | — | 反斜杠Reverse solidus (backslash) |
| ] | ] | — | 中括号右边部分Right square bracket |
| ^ | ^ | — | Caret |
| _ | _ | — | 下划线Horizontal bar (underscore) |
| ` | ` | — | 尖重音符Acute accent |
| a | a | — | 小写a Small a |
| b | b | — | 小写b Small b |
| c | c | — | 小写c Small c |
| d | d | — | 小写d Small d |
| e | e | — | 小写e Small e |
| f | f | — | 小写f Small f |
| g | g | — | 小写g Small g |
| h | h | — | 小写h Small h |
| i | i | — | 小写i Small i |
| j | j | — | 小写j Small j |
| k | k | — | 小写k Small k |
| l | l | — | 小写l Small l |
| m | m | — | 小写m Small m |
| n | n | — | 小写n Small n |
| o | o | — | 小写o Small o |
| p | p | — | 小写p Small p |
| q | q | — | 小写q Small q |
| r | r | — | 小写r Small r |
| s | s | — | 小写s Small s |
| t | t | — | 小写t Small t |
| u | u | — | 小写u Small u |
| v | v | — | 小写v Small v |
| w | w | — | 小写w Small w |
| x | x | — | 小写x Small x |
| y | y | — | 小写y Small y |
| z | z | — | 小写z Small z |
| { | { | — | 大括号左边部分Left curly brace |
| | | | | — | 竖线Vertical bar |
| } | } | — | 大括号右边部分Right curly brace |
| ~ | ~ | — | Tilde |
| — |  | — | 未使用Unused |
|   | | 空格Nonbreaking space | |
| ¡ | ¡ | ¡ | Inverted exclamation |
| ¢ | ¢ | ¢ | 货币分标志Cent sign |
| £ | £ | £ | 英镑标志Pound sterling |
| ¤ | ¤ | ¤ | 通用货币标志General currency sign |
| ¥ | ¥ | ¥ | 日元标志Yen sign |
| ¦ | ¦ | ¦ or &brkbar; | 断竖线Broken vertical bar |
| § | § | § | 分节号Section sign |
| ¨ | ¨ | ¨ or ¨ | 变音符号Umlaut |
| © | © | © | 版权标志Copyright |
| ª | ª | ª | Feminine ordinal |
| « | « | « | Left angle quote, guillemet left |
| ¬ | ¬ | ¬ | Not sign |
| | ­ | ­ | Soft hyphen |
| ® | ® | ® | 注册商标标志Registered trademark |
| ¯ | ¯ | ¯ or &hibar; | 长音符号Macron accent |
| ° | ° | ° | 度数标志Degree sign |
| ± | ± | ± | 加或减Plus or minus |
| ² | ² | ² | 上标2 Superscript two |
| ³ | ³ | ³ | 上标3 Superscript three |
| ´ | ´ | ´ | 尖重音符Acute accent |
| µ | µ | µ | Micro sign |
| ¶ | ¶ | ¶ | Paragraph sign |
| · | · | · | Middle dot |
| ¸ | ¸ | ¸ | Cedilla |
| ¹ | ¹ | ¹ | 上标1 Superscript one |
| º | º | º | Masculine ordinal |
| » | » | » | Right angle quote, guillemet right |
| ¼ | ¼ | ¼ | 四分之一Fraction one-fourth |
| ½ | ½ | ½ | 二分之一Fraction one-half |
| ¾ | ¾ | ¾ | 四分之三Fraction three-fourths |
| ¿ | ¿ | ¿ | Inverted question mark |
| À | À | À | Capital A, grave accent |
| Á | Á | Á | Capital A, acute accent |
| Â | Â | Â | Capital A, circumflex |
| Ã | Ã | Ã | Capital A, tilde |
| Ä | Ä | Ä | Capital A, di?esis / umlaut |
| Å | Å | Å | Capital A, ring |
| Æ | Æ | Æ | Capital AE ligature |
| Ç | Ç | Ç | Capital C, cedilla |
| È | È | È | Capital E, grave accent |
| É | É | É | Capital E, acute accent |
| Ê | Ê | Ê | Capital E, circumflex |
| Ë | Ë | Ë | Capital E, di?esis / umlaut |
| Ì | Ì | Ì | Capital I, grave accent |
| Í | Í | Í | Capital I, acute accent |
| Î | Î | Î | Capital I, circumflex |
| Ï | Ï | Ï | Capital I, di?esis / umlaut |
| Ð | Ð | Ð | Capital Eth, Icelandic |
| Ñ | Ñ | Ñ | Capital N, tilde |
| Ò | Ò | Ò | Capital O, grave accent |
| Ó | Ó | Ó | Capital O, acute accent |
| Ô | Ô | Ô | Capital O, circumflex |
| Õ | Õ | Õ | Capital O, tilde |
| Ö | Ö | Ö | Capital O, di?esis / umlaut |
| × | × | × | 乘号Multiply sign |
| Ø | Ø | Ø | Capital O, slash |
| Ù | Ù | Ù | Capital U, grave accent |
| Ú | Ú | Ú | Capital U, acute accent |
| Û | Û | Û | Capital U, circumflex |
| Ü | Ü | Ü | Capital U, di?esis / umlaut |
| Ý | Ý | Ý | Capital Y, acute accent |
| Þ | Þ | Þ | Capital Thorn, Icelandic |
| ß | ß | ß | Small sharp s, German sz |
| à | à | à | Small a, grave accent |
| á | á | á | Small a, acute accent |
| â | â | â | Small a, circumflex |
| ã | ã | ã | Small a, tilde |
| ä | ä | ä | Small a, di?esis / umlaut |
| å | å | å | Small a, ring |
| æ | æ | æ | Small ae ligature |
| ç | ç | ç | Small c, cedilla |
| è | è | è | Small e, grave accent |
| é | é | é | Small e, acute accent |
| ê | ê | ê | Small e, circumflex |
| ë | ë | ë | Small e, di?esis / umlaut |
| ì | ì | ì | Small i, grave accent |
| í | í | í | Small i, acute accent |
| î | î | î | Small i, circumflex |
| ï | ï | ï | Small i, di?esis / umlaut |
| ð | ð | ð | Small eth, Icelandic |
| ñ | ñ | ñ | Small n, tilde |
| ò | ò | ò | Small o, grave accent |
| ó | ó | ó | Small o, acute accent |
| ô | ô | ô | Small o, circumflex |
| õ | õ | õ | Small o, tilde |
| ö | ö | ö | Small o, di?esis / umlaut |
| ÷ | ÷ | ÷ | 除号Division sign |
| ø | ø | ø | Small o, slash |
| ù | ù | ù | Small u, grave accent |
| ú | ú | ú | Small u, acute accent |
| û | û | û | Small u, circumflex |
| ü | ü | ü | Small u, di?esis / umlaut |
| ý | ý | ý | Small y, acute accent |
| þ | þ | þ | Small thorn, Icelandic |
| ÿ | ÿ | ÿ | Small y, umlaut |
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