ASCII 控制字符

美国标准资讯交换标准码 ASCII 码中特殊的符号，电脑称为控制字符 Control Characters 并不代表任何可见的字符，而是用来控制电脑输出设备的行为。ASCII 用于电脑和通讯设备的编码系统，它将每个英文字母、数字和标点符号等符号，对应个七位元的 Binary Digit 二进位数字介于 0 到 127 的十进位数字。例如大写字母 A 的 ASCII 码是 65，小写字母 a 的 ASCII 码是 97，数字 0 的 ASCII 码是 48 等等。ASCII 为 American Standard Code for Information Interchange 的缩写。ASCII 编码是美国标准资讯交换标准码，计算机资讯传输的一种编码方式。

ASCII 定义了 256 个代码 (0~255)

Dec 对照 Decimal 十进位 0~31 控制字符 ASCII Control Characters

Dec 对照 Decimal 十进位 32~127 可列印字符 ASCII Printable Characters

Dec 对照 Decimal 十进位 0~127 标准的 ASCII 编码, 128~255 为扩展的 ASCII 编码

较常用控制字符、十进位 0~31

Char	Oct	Dec	Hex	Ctrl-Key	控制动作
NUL	0	0	0	^@	空字元 Null character
SOH	1	1	1	^A	标题开始 Start of heading
STX	2	2	2	^B	本文开始 Start of text
ETX	3	3	3	^C	本文结束 End of text
EOT	4	4	4	^D	传输结束 End of Submission, 不同于 ETB
ENQ	5	5	5	^E	请求查询 Enquiry, 与 ACK 一起使用
ACK	6	6	6	^F	确认回应 Acknowledge, 清除 ENQ 请求查询
BEL	7	7	7	^G	铃声 Bell, Rings Bell...
BS	10	8	8	^H	退格 Backspace, Delete 删除字元键
HT	11	9	9	^I	水平定位符号 Tab 空格键 Horizontal tab
LF	12	10	a	^J	换行键 Line Feed CHR(10)
VT	13	11	b	^K	直定位符号 Vertical tab
FF	14	12	c	^L	换页键 Form Feed, page eject
CR	15	13	d	^M	回车 [Enter] Carriage Return CHR(13)
SO	16	14	e	^N	取消变换 Shift Out, 替代字符集
SI	17	15	f	^O	启用变换 Shift In, 恢復默认字符集
DLE	20	16	10	^P	跳出资料通讯 Data link escape
DC1	21	17	11	^Q	设备控制一 Device control 1 (XON)
DC2	22	18	12	^R	设备控制二 Device control 2
DC3	23	19	13	^S	设备控制三 Device control 3 (XOFF)
DC4	24	20	14	^T	设备控制四 Device control 4
NAK	25	21	15	^U	否定失败回应 Negative acknowledge
SYN	26	22	16	^V	同步用暂停 Synchronous idle
ETB	27	23	17	^W	区块传输结束 End Submission block, 与 EOT 不同
CAN	30	24	17	^X	取消 Cancel line
EM	31	25	19	^Y	连线媒介中断 End of medium, Ctrl + Y 中断
SUB	32	26	1a	^Z	替代字符 Substitute
ESC	33	27	1b	^[	退出键 Escape, Esc
FS	34	28	1c	^\	档案分割符 File Separator
GS	35	29	1d	^]	群组分隔符 Group Separator
RS	36	30	1e	^^	记录分隔符 Record Separator, 块模终止符
US	37	31	1f	^_	单元分隔符 Unit Separator

ASCII 标准字符、十进位 32~127 编码

Char (字符)	八进位 Octal	十进位 Dec	十六进位 Hex	描述 Description
SP	40	32	20	Space
!	41	33	21	Exclamation mark
"	42	34	22	Quotation mark ( " in HTML)
#	43	35	23	Cross hatch (number sign)
$	44	36	24	Dollar sign
%	45	37	25	Percent sign
&	46	38	26	Ampersand
`	47	39	27	Closing single quote (apostrophe)
(	50	40	28	Opening parentheses
)	51	41	29	Closing parentheses
*	52	42	2a	Asterisk (star, multiply)
+	53	43	2b	Plus
,	54	44	2c	Comma
-	55	45	2d	Hyphen, dash, minus
.	56	46	2e	Period
/	57	47	2f	Slant (forward slash, divide)
0	60	48	30	Zero
1	61	49	31	One
2	62	50	32	Two
3	63	51	33	Three
4	64	52	34	Four
5	65	53	35	Five
6	66	54	36	Six
7	67	55	37	Seven
8	70	56	38	Eight
9	71	57	39	Nine
:	72	58	3a	Colon
;	73	59	3b	Semicolon
<	74	60	3c	Less than sign (< in HTML)
=	75	61	3d	Equals sign
>	76	62	3e	Greater than sign (> in HTML)
?	77	63	3f	Question mark
@	100	64	40	At-sign
A	101	65	41	Uppercase A
B	102	66	42	Uppercase B
C	103	67	43	Uppercase C
D	104	68	44	Uppercase D
E	105	69	45	Uppercase E
F	106	70	46	Uppercase F
G	107	71	47	Uppercase G
H	110	72	48	Uppercase H
I	111	73	49	Uppercase I
J	112	74	4a	Uppercase J
K	113	75	4b	Uppercase K
L	114	76	4c	Uppercase L
M	115	77	4d	Uppercase M
N	116	78	4e	Uppercase N
O	117	79	4f	Uppercase O
P	120	80	50	Uppercase P
Q	121	81	51	Uppercase Q
R	122	82	52	Uppercase R
S	123	83	53	Uppercase S
T	124	84	54	Uppercase T
U	125	85	55	Uppercase U
V	126	86	56	Uppercase V
W	127	87	57	Uppercase W
X	130	88	58	Uppercase X
Y	131	89	59	Uppercase Y
Z	132	90	5a	Uppercase Z
[	133	91	5b	Opening square bracket
\	134	92	5c	Reverse slant (Backslash)
]	135	93	5d	Closing square bracket
^	136	94	5e	Caret (Circumflex)
_	137	95	5f	Underscore
`	140	96	60	Opening single quote
a	141	97	61	Lowercase a
b	142	98	62	Lowercase b
c	143	99	63	Lowercase c
d	144	100	64	Lowercase d
e	145	101	65	Lowercase e
f	146	102	66	Lowercase f
g	147	103	67	Lowercase g
h	150	104	68	Lowercase h
i	151	105	69	Lowercase i
j	152	106	6a	Lowercase j
k	153	107	6b	Lowercase k
l	154	108	6c	Lowercase l
m	155	109	6d	Lowercase m
n	156	110	6e	Lowercase n
o	157	111	6f	Lowercase o
p	160	112	70	Lowercase p
q	161	113	71	Lowercase q
r	162	114	72	Lowercase r
s	163	115	73	Lowercase s
t	164	116	74	Lowercase t
u	165	117	75	Lowercase u
v	166	118	76	Lowercase v
w	167	119	77	Lowercase w
x	170	120	78	Lowercase x
y	171	121	79	Lowercase y
z	172	122	7a	Lowercase z
{	173	123	7b	Opening curly brace
\|	174	124	7c	Vertical line
}	175	125	7d	Closing curly brace
~	176	126	7e	Tilde (approximate)
DEL	177	127	7f	Delete (rubout), cross-hatch box

资讯交换码

标准资讯交换码，互联网 Internet 号码分配机构 IANA 使用现代名称 US-ASCII。通过这种方式使用统一、字符处理、字符保存、通信和印刷通用符号，ASCII 主要用于网路讯息间传递、电子通信的字符编码标准、最初定义基于英文字母表 0~127 将 128 个字符编码为 7 位整数之信息交换标准代码。包括 32 个非打印控制用字符、加上 95 个可显示编码字符，数字 0-9 和小写字母 a-z 和大写字母 A-Z 以及标点符号和可显示列印符号。

ASCII 扩展字符 128~255

Char (字符)	八进位 Octal	十进位 Dec	十六进位 Hex	描述 Description
Ç	200	128	80	Majuscule C-cedilla
ü	201	129	81	Letter u with Umlaut or Diuresis, u-umlaut
é	202	130	82	Letter e with Acute accent or e-acute
â	203	131	83	Letter a with Circumflex accent or a-circumflex
ä	204	132	84	Letter a with Umlaut or diuresis, a-umlaut
à	205	133	85	Letter a with Grave accent
å	206	134	86	Letter a with a Ring
ç	207	135	87	Minuscule C-Cedilla
ê	210	136	88	Letter e with Circumflex accent or e-circumflex
ë	211	137	89	Letter e with Umlaut or diuresis, e-umlauts
è	212	138	8a	Letter e with Grave accent
ï	213	139	8b	Letter i with Umlaut or diuresis, i-umlaut
î	214	140	8c	Letter i with Circumflex accent or i-circumflex
ì	215	141	8d	Letter i with Grave accent
Ä	216	142	8e	Letter A with Umlaut or Diuresis, A-umlaut
Å	217	143	8f	Capital letter A with a ring
É	220	144	90	Capital letter E with acute accent or E-acute
æ	221	145	91	Latin Diphthong AE in lowercase
Æ	222	146	92	Latin Diphthong AE in uppercase
ô	223	147	93	Letter o with Circumflex accent or o-circumflex
ö	224	148	94	Letter o with Umlaut or diuresis, o-umlaut
ò	225	149	95	Letter o with Grave accent
û	226	150	96	Letter u with Circumflex accent or u-circumflex
ù	227	151	97	Letter u with Grave accent
ÿ	230	152	98	Lowercase Letter Y with diuresis
Ö	231	153	99	Letter O with Umlaut or diuresis, O-umlaut
Ü	232	154	9a	Letter U with Umlaut or diuresis, U-umlaut
ø	233	155	9b	Lowercase Slashed zero or empty set
£	234	156	9c	Pound sign, Symbol for the pound sterling
Ø	235	157	9d	Uppercase slashed zero or empty set
×	236	158	9e	Multiplication sign
ƒ	237	159	9f	Function sign, F with hook sign, florin sign
á	240	160	a0	Lowercase Letter a with acute accent or a-acute
í	241	161	a1	Lowercase Letter i with acute accent or i-acute
ó	242	162	a2	Lowercase Letter o with acute accent or o-acute
ú	243	163	a3	Lowercase Letter u with acute accent or u-acute
ñ	244	164	a4	Enie, eñe, spanish letter, lowercase n with tilde
Ñ	245	165	a5	Spanish letter, uppercase N with tilde, EÑE
ª	246	166	a6	Feminine ordinal indicator
º	247	167	a7	Masculine ordinal indicator
¿	250	168	a8	Inverted question marks
®	251	169	a9	Registered trademark symbol
¬	252	170	aa	Logical negation symbol
½	253	171	ab	One half
¼	254	172	ac	Quarter, one fourth
¡	255	173	ad	Inverted exclamation marks
«	256	174	ae	Angle quotes, guillemets, right-pointing quotation mark
»	257	175	af	Guillemets, angle quotes, left-pointing quotation marks
░	260	176	b0	Graphic character, low density dotted
▒	261	177	b1	Graphic character, medium density dotted
▓	262	178	b2	Graphic character, high density dotted
│	263	179	b3	Box drawing character single vertical line
┤	264	180	b4	Box drawing character single vertical and left line
Á	265	181	b5	Capital letter A with acute accent or A-acute
Â	266	182	b6	Letter A with circumflex accent or A-circumflex
À	267	183	b7	Letter A with grave accent
©	270	184	b8	Copyright symbol
╣	271	185	b9	Box drawing character double line vertical and left
║	272	186	ba	Box drawing character double vertical line
╗	273	187	bb	Box drawing character double line upper right corner
╝	274	188	bc	Box drawing character double line lower right corner
¢	275	189	bd	Cent symbol
¥	276	190	be	YEN and YUAN sign
┐	277	191	bf	Box drawing character single line upper right corner
└	300	192	c0	Box drawing character single line lower left corner
┴	301	193	c1	Box drawing character single line horizontal and up
┬	302	194	c2	Box drawing character single line horizontal down
├	303	195	c3	Box drawing character single line vertical and right
─	304	196	c4	Box drawing character single horizontal line
┼	305	197	c5	Box drawing character single line horizontal vertical
ã	306	198	c6	Lowercase letter a with tilde or a-tilde
Ã	307	199	c7	Capital letter A with tilde or A-tilde
╚	310	200	c8	Box drawing character double line lower left corner
╔	311	201	c9	Box drawing character double line upper left corner
╩	312	202	ca	Box drawing character double line horizontal and up
╦	313	203	cb	Box drawing character double line horizontal down
╠	314	204	cc	Box drawing character double line vertical and right
═	315	205	cd	Box drawing character double horizontal line
╬	316	206	ce	Box drawing character double line horizontal vertical
¤	317	207	cf	Generic currency sign
ð	320	208	d0	Lowercase letter eth
Ð	321	209	d1	Capital letter Eth
Ê	322	210	d2	Letter E with circumflex accent or E-circumflex
Ë	323	211	d3	Letter E with umlaut or diuresis, E-umlaut
È	324	212	d4	Capital letter E with grave accent
ı	325	213	d5	Lowercase dot less i
Í	326	214	d6	Capital letter I with acute accent or I-acute
Î	327	215	d7	Letter I with circumflex accent or I-circumflex
Ï	330	216	d8	Letter I with umlaut or diuresis, I-umlaut
┘	331	217	d9	Box drawing character single line lower right corner
┌	332	218	da	Box drawing character single line upper left corner
█	333	219	db	Block, graphic character
▄	334	220	dc	Bottom half block
¦	335	221	dd	Vertical broken bar
Ì	336	222	de	Capital letter I with grave accent
▀	337	223	df	Top half block
Ó	340	224	e0	Capital letter O with acute accent or O-acute
ß	341	225	e1	Letter Eszett, scharfes S or sharp S
Ô	342	226	e2	Letter O with circumflex accent or O-circumflex
Ò	343	227	e3	Capital letter O with grave accent
õ	344	228	e4	Lowercase letter o with tilde or o-tilde
Õ	345	229	e5	Capital letter O with tilde or O-tilde
µ	346	230	e6	Lowercase letter Mu, micro sign or micron
þ	347	231	e7	Lowercase letter Thorn
Þ	350	232	e8	Capital letter Thorn
Ú	351	233	e9	Capital letter U with acute accent or U-acute
Û	352	234	ea	Letter U with circumflex accent or U-circumflex
Ù	353	235	eb	Capital letter U with grave accent
ý	354	236	ec	Lowercase letter y with acute accent
Ý	355	237	ed	Capital letter Y with acute accent
¯	356	238	ee	Macron symbol
´	357	239	ef	Acute accent
≡	360	240	f0	Congruence relation symbol
±	361	241	f1	Plus-minus sign
‗	362	242	f2	underline or underscore
¾	363	243	f3	three quarters, three-fourths
¶	364	244	f4	Paragraph sign or pilcrow, end paragraph mark
§	365	245	f5	Section sign
÷	366	246	f6	The division sign, Obelus
¸	367	247	f7	cedilla
°	370	248	f8	Degree symbol
¨	371	249	f9	Diaresis
·	372	250	fa	Interpunct or space dot
¹	373	251	fb	Superscript one, exponent 1, first power
³	374	252	fc	Superscript three, exponent 3, cube, third power
²	375	253	fd	Superscript two, exponent 2, square, second power
■	376	254	fe	black square
	377	255	ff	Non-breaking space or no-break space