HTML字符实体(Character Entities)
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。
如何显示空格
通常情况下，HTML会自动截去多余的空格。不管你加多少空格，都被看做一个空格。比如你在两个字之间加了10个空格，HTML会截去9个空格，只保留一个。为了在网页中增加空格，你可以使用 表示空格。
最常用的字符实体(Character Entities)
| 显示结果 |
说明 |
Entity Name |
Entity Number |
|
显示一个空格 |
|
|
| < |
小于 |
< |
< |
| > |
大于 |
> |
> |
| & |
&符号 |
& |
& |
| " |
双引号 |
" |
" |
其他常用的字符实体(Character Entities)
| 显示结果 |
说明 |
Entity Name |
Entity Number |
| ? |
版权 |
© |
© |
| ? |
注册商标 |
® |
® |
| × |
乘号 |
× |
× |
| ÷ |
除号 |
÷ |
÷ |
ISO Latin-1字符集:
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
ˉ ¯ ¯ 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 四分之一Fraction one-fourth
? ½ ½ 二分之一Fraction one-half
? 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 Capital A, circumflex
? Ã Ã Capital A, tilde
? Ä Ä Capital A, di?esis / umlaut
? Å Å Capital A, ring
? Æ Æ Capital AE ligature
? 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 Capital E, di?esis / umlaut
ì Ì Ì Capital I, grave accent
í Í Í Capital I, acute accent
? Î Î Capital I, circumflex
? Ï Ï Capital I, di?esis / umlaut
D Ð Ð Capital Eth, Icelandic
? Ñ Ñ Capital N, tilde
ò Ò Ò Capital O, grave accent
ó Ó Ó Capital O, acute accent
? Ô Ô Capital O, circumflex
? Õ Õ Capital O, tilde
? Ö Ö Capital O, di?esis / umlaut
× × × 乘号Multiply sign
? Ø Ø Capital O, slash
ù Ù Ù Capital U, grave accent
ú Ú Ú Capital U, acute accent
? Û Û Capital U, circumflex
ü Ü Ü Capital U, di?esis / umlaut
Y Ý Ý Capital Y, acute accent
T Þ Þ Capital Thorn, Icelandic
? ß ß Small sharp s, German sz
à à à Small a, grave accent
á á á Small a, acute accent
a â â Small a, circumflex
? ã ã Small a, tilde
? ä ä Small a, di?esis / umlaut
? å å Small a, ring
? æ æ Small ae ligature
? 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 Small e, di?esis / umlaut
ì ì ì Small i, grave accent
í í í Small i, acute accent
? î î Small i, circumflex
? ï ï Small i, di?esis / umlaut
e ð ð Small eth, Icelandic
? ñ ñ Small n, tilde
ò ò ò Small o, grave accent
ó ó ó Small o, acute accent
? ô ô Small o, circumflex
? õ õ Small o, tilde
? ö ö Small o, di?esis / umlaut
÷ ÷ ÷ 除号Division sign
? ø ø Small o, slash
ù ù ù Small u, grave accent
ú ú ú Small u, acute accent
? û û Small u, circumflex
ü ü ü Small u, di?esis / umlaut
y ý ý Small y, acute accent
t þ þ Small thorn, Icelandic
? ÿ ÿ Small y, umlaut
symbols, mathematical symbols, and Greek letters
|
?
|
ƒ |
Α
|
Α |
Β
|
Β |
Γ
|
Γ |
Δ
|
Δ |
|
Ε
|
Ε |
Ζ
|
Ζ |
Η
|
Η |
Θ
|
Θ |
Ι
|
Ι |
|
Κ
|
Κ |
Λ
|
Λ |
Μ
|
Μ |
Ν
|
Ν |
Ξ
|
Ξ |
|
Ο
|
Ο |
Π
|
Π |
Ρ
|
Ρ |
Σ
|
Σ |
Τ
|
Τ |
|
Υ
|
Υ |
Φ
|
Φ |
Χ
|
Χ |
Ψ
|
Ψ |
Ω
|
Ω |
|
α
|
α |
β
|
β |
γ
|
γ |
δ
|
δ |
ε
|
ε |
|
ζ
|
ζ |
η
|
η |
θ
|
θ |
ι
|
ι |
κ
|
κ |
|
λ
|
λ |
μ
|
μ |
ν
|
ν |
ξ
|
ξ |
ο
|
ο |
|
π
|
π |
ρ
|
ρ |
?
|
ς |
σ
|
σ |
τ
|
τ |
|
υ
|
υ |
φ
|
φ |
χ
|
χ |
ψ
|
ψ |
ω
|
ω |
|
?
|
ϑ |
?
|
ϒ |
?
|
ϖ |
?
|
• |
…
|
… |
|
′
|
′ |
″
|
″ |
￣
|
‾ |
?
|
⁄ |
?
|
℘ |
|
?
|
ℑ |
?
|
ℜ |
?
|
™ |
?
|
ℵ |
←
|
← |
|
↑
|
↑ |
→
|
→ |
↓
|
↓ |
?
|
↔ |
?
|
↵ |
|
?
|
⇐ |
?
|
⇑ |
?
|
⇒ |
?
|
⇓ |
?
|
⇔ |
|
?
|
∀ |
?
|
∂ |
?
|
∃ |
?
|
∅ |
?
|
∇ |
|
∈
|
∈ |
?
|
∉ |
?
|
∋ |
∏
|
∏ |
∑
|
∑ |
|
?
|
− |
?
|
∗ |
√
|
√ |
∝
|
∝ |
∞
|
∞ |
|
∠
|
∠ |
∧
|
∧ |
∨
|
∨ |
∩
|
∩ |
∪
|
∪ |
|
∫
|
∫ |
∴
|
∴ |
～
|
∼ |
?
|
≅ |
≈
|
≈ |
|
≠
|
≠ |
≡
|
≡ |
≤
|
≤ |
≥
|
≥ |
?
|
⊂ |
|
?
|
⊃ |
?
|
⊄ |
?
|
⊆ |
?
|
⊇ |
⊕
|
⊕ |
|
?
|
⊗ |
⊥
|
⊥ |
?
|
⋅ |
?
|
⌈ |
?
|
⌉ |
|
?
|
⌊ |
?
|
⌋ |
?
|
⟨ |
?
|
⟩ |
?
|
◊ |
|
?
|
♠ |
?
|
♣ |
?
|
♥ |
?
|
♦ |
markup-significant and internationalization characters
|
“
|
" |
&
|
& |
<
|
< |
>
|
> |
?
|
Π|
|
?
|
œ |
?
|
Š |
?
|
š |
?
|
Ÿ |
?
|
ˆ |
|
?
|
˜ |
?
|
  |
?
|
  |
?
|
  |
?
|
‌ |
|
?
|
‍ |
?
|
‎ |
?
|
‏ |
–
|
– |
—
|
— |
|
‘
|
‘ |
’
|
’ |
?
|
‚ |
“
|
“ |
”
|
” |
|
?
|
„ |
?
|
† |
?
|
‡ |
‰
|
‰ |
?
|
‹ |
|
?
|
› |
?/STRONG>
|
€ |