JS实现——Base64编码解码，带16进制显示

在网上找了个JS实现的Base64编码转换，所以就想自己研究下，界面如下：

将代码以BASE64方式加密、解密

请输入要进行编码或解码的字符：

编码结果以ASCII码16进制显示
解码结果以ASCII码16进制显示

Base64编码或解码结果：

Base64编码说明
　　Base64编码要求把3个8位字节（3*8=24）转化为4个6位的字节（4*6=24），之后在6位的前面补两个0，形成8位一个字节的形式。如果剩下的字符不足3个字节，则用0填充，输出字符使用'='，因此编码后输出的文本末尾可能会出现1或2个'='。

　　为了保证所输出的编码位可读字符，Base64制定了一个编码表，以便进行统一转换。编码表的大小为2^6=64，这也是Base64名称的由来。

Base64编码表

码值	字符	码值	字符	码值	字符	码值	字符
0	A	16	Q	32	g	48	w
1	B	17	R	33	h	49	x
2	C	18	S	34	i	50	y
3	D	19	T	35	j	51	z
4	E	20	U	36	k	52	0
5	F	21	V	37	l	53	1
6	G	22	W	38	m	54	2
7	H	23	X	39	n	55	3
8	I	24	Y	40	o	56	4
9	J	25	Z	41	p	57	5
10	K	26	a	42	q	58	6
11	L	27	b	43	r	59	7
12	M	28	c	44	s	60	8
13	N	29	d	45	t	61	9
14	O	30	e	46	u	62	+
15	P	31	f	47	v	63	/

通过本工具可以对代码进行Base64加密或者解密。Base64是网络上最常见的用于传输8Bit字节代码的编码方式之一。

ASCII码表详解

ASCII码大致可以分作三部分组成。
第一部分是：ASCII非打印控制字符
 第二部分是：ASCII打印字符；
第三部分是：扩展ASCII打印字符

第一部分：ASCII非打印控制字符表

ASCII表上的数字0–31分配给了控制字符，用于控制像打印机等一些外围设备。例如，12代表换页/新页功能。此命令指示打印机跳到下一页的开头。（参详ASCII码表中0-31）

第二部分：ASCII打印字符

数字 32–126 分配给了能在键盘上找到的字符，当您查看或打印文档时就会出现。数字127代表 DELETE 命令。（参详ASCII码表中32-127）

ASCII码表 0-127

Bin	Dec	Hex	缩写/字符	解释
00000000	0	00	NUL(null)	空字符
00000001	1	01	SOH(start of headling)	标题开始
00000010	2	02	STX (start of text)	正文开始
00000011	3	03	ETX (end of text)	正文结束
00000100	4	04	EOT (end of transmission)	传输结束
00000101	5	05	ENQ (enquiry)	请求
00000110	6	06	ACK (acknowledge)	收到通知
00000111	7	07	BEL (bell)	响铃
00001000	8	08	BS (backspace)	退格
00001001	9	09	HT (horizontal tab)	水平制表符
00001010	10	0A	LF (NL line feed, new line)	换行键
00001011	11	0B	VT (vertical tab)	垂直制表符
00001100	12	0C	FF (NP form feed, new page)	换页键
00001101	13	0D	CR (carriage return)	回车键
00001110	14	0E	SO (shift out)	不用切换
00001111	15	0F	SI (shift in)	启用切换
00010000	16	10	DLE (data link escape)	数据链路转义
00010001	17	11	DC1 (device control 1)	设备控制1
00010010	18	12	DC2 (device control 2)	设备控制2
00010011	19	13	DC3 (device control 3)	设备控制3
00010100	20	14	DC4 (device control 4)	设备控制4
00010101	21	15	NAK (negative acknowledge)	拒绝接收
00010110	22	16	SYN (synchronous idle)	同步空闲
00010111	23	17	ETB (end of trans. block)	传输块结束
00011000	24	18	CAN (cancel)	取消
00011001	25	19	EM (end of medium)	介质中断
00011010	26	1A	SUB (substitute)	替补
00011011	27	1B	ESC (escape)	溢出
00011100	28	1C	FS (file separator)	文件分割符
00011101	29	1D	GS (group separator)	分组符
00011110	30	1E	RS (record separator)	记录分离符
00011111	31	1F	US (unit separator)	单元分隔符
00100000	32	20	(space)	空格
00100001	33	21	!
00100010	34	22	"
00100011	35	23	#
00100100	36	24	$
00100101	37	25	%
00100110	38	26	&
00100111	39	27	'
00101000	40	28	(
00101001	41	29	)
00101010	42	2A	*
00101011	43	2B	+
00101100	44	2C	,
00101101	45	2D	-
00101110	46	2E	.
00101111	47	2F	/
00110000	48	30	0
00110001	49	31	1
00110010	50	32	2
00110011	51	33	3
00110100	52	34	4
00110101	53	35	5
00110110	54	36	6
00110111	55	37	7
00111000	56	38	8
00111001	57	39	9
00111010	58	3A	:
00111011	59	3B	;
00111100	60	3C	<
00111101	61	3D	=
00111110	62	3E	>
00111111	63	3F	?
01000000	64	40	@
01000001	65	41	A
01000010	66	42	B
01000011	67	43	C
01000100	68	44	D
01000101	69	45	E
01000110	70	46	F
01000111	71	47	G
01001000	72	48	H
01001001	73	49	I
01001010	74	4A	J
01001011	75	4B	K
01001100	76	4C	L
01001101	77	4D	M
01001110	78	4E	N
01001111	79	4F	O
01010000	80	50	P
01010001	81	51	Q
01010010	82	52	R
01010011	83	53	S
01010100	84	54	T
01010101	85	55	U
01010110	86	56	V
01010111	87	57	W
01011000	88	58	X
01011001	89	59	Y
01011010	90	5A	Z
01011011	91	5B	[
01011100	92	5C	\
01011101	93	5D	]
01011110	94	5E	^
01011111	95	5F	_
01100000	96	60	`
01100001	97	61	a
01100010	98	62	b
01100011	99	63	c
01100100	100	64	d
01100101	101	65	e
01100110	102	66	f
01100111	103	67	g
01101000	104	68	h
01101001	105	69	i
01101010	106	6A	j
01101011	107	6B	k
01101100	108	6C	l
01101101	109	6D	m
01101110	110	6E	n
01101111	111	6F	o
01110000	112	70	p
01110001	113	71	q
01110010	114	72	r
01110011	115	73	s
01110100	116	74	t
01110101	117	75	u
01110110	118	76	v
01110111	119	77	w
01111000	120	78	x
01111001	121	79	y
01111010	122	7A	z
01111011	123	7B	{
01111100	124	7C	\|
01111101	125	7D	}
01111110	126	7E	~
01111111	127	7F	DEL (delete)	删除

第三部分：扩展ASCII打印字符

扩展的ASCII字符满足了对更多字符的需求。扩展的ASCII包含ASCII中已有的128个字符（数字0–32显示在下图中），又增加了128个字符，总共是256个。即使有了这些更多的字符，许多语言还是包含无法压缩到256个字符中的符号。因此，出现了一些ASCII的变体来囊括地区性字符和符号。例如，许多软件程序把ASCII表（又称作ISO8859-1）用于北美、西欧、澳大利亚和非洲的语言。

出处：http://www1.tc711.com/tool/BASE64.htm

http://www.asciima.com/

=================================================================================================================================

代码如下：

<!DOCTYPE html>  
<html>  
<head>  
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  

<title>Base64编码/解码器 在线解码</title>
<style type="text/css">
#code {
    text-align: left;
}
.c {
    text-align: left;
}
body,td,th {
    font-size: 12px;
}
a:link {
    color: #666;
    text-decoration: none;
}
a:visited {
    text-decoration: none;
    color: #666;
}
a:hover {
    text-decoration: underline;
    color: #666;
}
a:active {
    text-decoration: none;
    color: #F00;
}
</style>
</head>
<SCRIPT type=text/javascript>
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);

function base64encode(str) {
    var out, i, len;
    var c1, c2, c3;

    len = str.length;
    i = 0;
    out = "";
    while(i < len) {
    c1 = str.charCodeAt(i++) & 0xff;
    if(i == len)
    {
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt((c1 & 0x3) << 4);
        out += "==";
        break;
    }
    c2 = str.charCodeAt(i++);
    if(i == len)
    {
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
        out += base64EncodeChars.charAt((c2 & 0xF) << 2);
        out += "=";
        break;
    }
    c3 = str.charCodeAt(i++);
    out += base64EncodeChars.charAt(c1 >> 2);
    out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
    out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
    out += base64EncodeChars.charAt(c3 & 0x3F);
    }
    return out;
}

function base64decode(str) {
    var c1, c2, c3, c4;
    var i, len, out;

    len = str.length;
    i = 0;
    out = "";
    while(i < len) {
    /* c1 */
    do {
        c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    } while(i < len && c1 == -1);
    if(c1 == -1)
        break;

    /* c2 */
    do {
        c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    } while(i < len && c2 == -1);
    if(c2 == -1)
        break;

    out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

    /* c3 */
    do {
        c3 = str.charCodeAt(i++) & 0xff;
        if(c3 == 61)
        return out;
        c3 = base64DecodeChars[c3];
    } while(i < len && c3 == -1);
    if(c3 == -1)
        break;

    out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

    /* c4 */
    do {
        c4 = str.charCodeAt(i++) & 0xff;
        if(c4 == 61)
        return out;
        c4 = base64DecodeChars[c4];
    } while(i < len && c4 == -1);
    if(c4 == -1)
        break;
    out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
    }
    return out;
}

function utf16to8(str) {
    var out, i, len, c;

    out = "";
    len = str.length;
    for(i = 0; i < len; i++) {
    c = str.charCodeAt(i);
    if ((c >= 0x0001) && (c <= 0x007F)) {
        out += str.charAt(i);
    } else if (c > 0x07FF) {
        out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
        out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));
        out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
    } else {
        out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));
        out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
    }
    }
    return out;
}

function utf8to16(str) {
    var out, i, len, c;
    var char2, char3;

    out = "";
    len = str.length;
    i = 0;
    while(i < len) {
    c = str.charCodeAt(i++);
    switch(c >> 4)
    { 
      case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
        // 0xxxxxxx
        out += str.charAt(i-1);
        break;
      case 12: case 13:
        // 110x xxxx   10xx xxxx
        char2 = str.charCodeAt(i++);
        out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
        break;
      case 14:
        // 1110 xxxx  10xx xxxx  10xx xxxx
        char2 = str.charCodeAt(i++);
        char3 = str.charCodeAt(i++);
        out += String.fromCharCode(((c & 0x0F) << 12) |
                       ((char2 & 0x3F) << 6) |
                       ((char3 & 0x3F) << 0));
        break;
    }
    }

    return out;
}

function CharToHex(str) {
    var out, i, h;
    out = "";
    i = 0;
    while(i < str.length) 
    {
        h = str.charCodeAt(i++).toString(16);
        out += "\\0x" + h;
        out +=(i > 0 && i % 8 == 0)?"\r\n":", ";
    }
    return out;
}

function doEncode() {
    var src = document.getElementById('src').value;
    var opts = document.getElementById('opt1');
    document.getElementById('dest').value = opts.checked?CharToHex(base64encode(utf16to8(src))):base64encode(utf16to8(src));
}

function doDecode() {
    var src = document.getElementById('src').value;
    var opts = document.getElementById('opt2');
    document.getElementById('dest').value = opts.checked?CharToHex(base64decode(src)):utf8to16(base64decode(src));
}


</SCRIPT>
<body>
<center>
  <h3>将代码以BASE64方式加密、解密</h3>
    <p class="medium">
      <br />
    请输入要进行编码或解码的字符：</p>
<textarea name="src" id="src" cols="80" rows="6" style="width:600px;height:120px;"></textarea>
<p class="tcenter">
<input onclick="doEncode();" type="button" value="编 码" name="encode" class="button" />
<label><input type="checkbox" value="hex" id="opt1" />编码结果以ASCII码16进制显示</label><br />
<input onclick="doDecode();" type="button" value="解 码" name="decode" class="button" />
<label><input type="checkbox" value="hex" id="opt2" />解码结果以ASCII码16进制显示</label>
</p>
<p class="medium">Base64编码或解码结果：</p>
<textarea name="dest" id="dest" cols="80" rows="6" style="width:600px;height:120px;"></textarea>

<hr size="1" noshade="noshade" class="hline" width="600" />
<p class="medium" align="left" style="width:600px">
<strong>Base64编码说明</strong><br />
　　Base64编码要求把3个8位字节（3*8=24）转化为4个6位的字节（4*6=24），之后在6位的前面补两个0，形成8位一个字节的形式。 如果剩下的字符不足3个字节，则用0填充，输出字符使用'='，因此编码后输出的文本末尾可能会出现1或2个'='。
</p>
<p class="medium" align="left" style="width:600px">
　　为了保证所输出的编码位可读字符，Base64制定了一个编码表，以便进行统一转换。编码表的大小为2^6=64，这也是Base64名称的由来。
</p>
<h2 class="medium">Base64编码表</h2>
<table class="mtable" style="text-align:center">
<tr>
<th scope="col">码值</th>
<th scope="col">字符</th>
<td rowspan="18">&#160;</td>
<th scope="col">码值</th>
<th scope="col">字符</th>
<td rowspan="18">&#160;</td>
<th scope="col">码值</th>
<th scope="col">字符</th>
<td rowspan="18">&#160;</td>
<th scope="col">码值</th>
<th scope="col">字符</th>
</tr>
<tr>
<td>0</td>
<td>A</td>
<td>16</td>
<td>Q</td>
<td>32</td>
<td>g</td>
<td>48</td>
<td>w</td>
</tr>
<tr>
<td>1</td>
<td>B</td>
<td>17</td>
<td>R</td>
<td>33</td>
<td>h</td>
<td>49</td>
<td>x</td>
</tr>
<tr>
<td>2</td>
<td>C</td>
<td>18</td>
<td>S</td>
<td>34</td>
<td>i</td>
<td>50</td>
<td>y</td>
</tr>
<tr>
<td>3</td>
<td>D</td>
<td>19</td>
<td>T</td>
<td>35</td>
<td>j</td>
<td>51</td>
<td>z</td>
</tr>
<tr>
<td>4</td>
<td>E</td>
<td>20</td>
<td>U</td>
<td>36</td>
<td>k</td>
<td>52</td>
<td>0</td>
</tr>
<tr>
<td>5</td>
<td>F</td>
<td>21</td>
<td>V</td>
<td>37</td>
<td>l</td>
<td>53</td>
<td>1</td>
</tr>
<tr>
<td>6</td>
<td>G</td>
<td>22</td>
<td>W</td>
<td>38</td>
<td>m</td>
<td>54</td>
<td>2</td>
</tr>
<tr>
<td>7</td>
<td>H</td>
<td>23</td>
<td>X</td>
<td>39</td>
<td>n</td>
<td>55</td>
<td>3</td>
</tr>
<tr>
<td>8</td>
<td>I</td>
<td>24</td>
<td>Y</td>
<td>40</td>
<td>o</td>
<td>56</td>
<td>4</td>
</tr>
<tr>
<td>9</td>
<td>J</td>
<td>25</td>
<td>Z</td>
<td>41</td>
<td>p</td>
<td>57</td>
<td>5</td>
</tr>
<tr>
<td>10</td>
<td>K</td>
<td>26</td>
<td>a</td>
<td>42</td>
<td>q</td>
<td>58</td>
<td>6</td>
</tr>
<tr>
<td>11</td>
<td>L</td>
<td>27</td>
<td>b</td>
<td>43</td>
<td>r</td>
<td>59</td>
<td>7</td>
</tr>
<tr>
<td>12</td>
<td>M</td>
<td>28</td>
<td>c</td>
<td>44</td>
<td>s</td>
<td>60</td>
<td>8</td>
</tr>
<tr>
<td>13</td>
<td>N</td>
<td>29</td>
<td>d</td>
<td>45</td>
<td>t</td>
<td>61</td>
<td>9</td>
</tr>
<tr>
<td>14</td>
<td>O</td>
<td>30</td>
<td>e</td>
<td>46</td>
<td>u</td>
<td>62</td>
<td>+</td>
</tr>
<tr>
<td>15</td>
<td>P</td>
<td>31</td>
<td>f</td>
<td>47</td>
<td>v</td>
<td>63</td>
<td>/</td>
</tr>
</table><br />
  <br />
  <br />
  <br />
  通过本工具可以对代码进行Base64加密或者解密。Base64是网络上最常见的用于传输8Bit字节代码的编码方式之一。   <br />
  <br />


<style>
body,p,dl,dd,table,td,th,input,img,form,div,ul,li{font-family:Arial;word-break: all; font-size:12px; color:#333;}
.l{float:left}
#main{margin:10px 0 0;}
.bd{ margin-bottom:10px; width:700px;text-align:left;}
.bd .outer{border:1px solid #CCC}
.bd h3{margin:0;padding:2px 10px 0 10px;background:#F1F1F1 url(img/h3_bg.jpg) repeat-x;font-size:14px;line-height:38px;color:#538753;border:solid #FFF;border-width:0 1px;}
.line{margin:10px 10px 0;border-top:1px solid #d1d1d1;border-bottom:1px solid #fff;}
.buss{padding:0 20px 20px;line-height:28px;font-size:14px;color:#333;}
.buss h3{font-size:14px;margin:0 -20px;border-top:1px solid #d1d1d1;color:#538753;}
.buss h4{font-size:14px; margin:0 0 5px 0}
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<div class="bd">
<div class="outer">
        <h3>ASCII码表详解</h3>
        <div class="buss">
        <p>ASCII码大致可以分作三部分组成。<br>
<a href="#a1">第一部分是：ASCII非打印控制字符</a><br>
<a href="#a2">第二部分是：ASCII打印字符</a>；<br>
<a href="#a3">第三部分是：扩展ASCII打印字符</a>
</p>
<a name="a1"></a>
<h3>第一部分：ASCII非打印控制字符表</h3>
<p>ASCII表上的数字0–31分配给了控制字符，用于控制像打印机等一些外围设备。例如，12代表换页/新页功能。此命令指示打印机跳到下一页的开头。（参详ASCII码表中0-31）</p>
<a name="a2"></a>
<h3>第二部分：ASCII打印字符</h3>
<p>数字 32–126 分配给了能在键盘上找到的字符，当您查看或打印文档时就会出现。数字127代表 DELETE 命令。（参详ASCII码表中32-127）</p>
<p><strong>ASCII码表 0-127</strong></p>
<p></p><div class="t1 bgg">
<table width="100%" border="0" cellspacing="1" cellpadding="5" tr="" bgcolor="CCCCCC">
  <tbody><tr bgcolor="C5D5C5">
    <td width="15%">Bin</td>
    <td width="10%">Dec</td>
    <td width="10%">Hex</td>
    <td width="40%">缩写/字符</td>
    <td width="25%">解释</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00000000</td>
    <td>0</td>
    <td>00 </td>
    <td>NUL(null)</td>
    <td>空字符 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00000001</td>
    <td>1</td>
    <td>01</td>
    <td>SOH(start of headling)</td>
    <td>标题开始 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00000010</td>
    <td>2</td>
    <td>02</td>
    <td>STX (start of text)</td>
    <td>正文开始 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00000011</td>
    <td>3</td>
    <td>03</td>
    <td>ETX (end of text)</td>
    <td>正文结束 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00000100</td>
    <td>4</td>
    <td>04</td>
    <td>EOT (end of transmission)</td>
    <td>传输结束 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00000101</td>
    <td>5</td>
    <td>05</td>
    <td>ENQ (enquiry)</td>
    <td>请求 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00000110</td>
    <td>6</td>
    <td>06</td>
    <td>ACK (acknowledge)</td>
    <td>收到通知 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00000111</td>
    <td>7</td>
    <td>07</td>
    <td>BEL (bell)</td>
    <td>响铃 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00001000</td>
    <td>8</td>
    <td>08</td>
    <td>BS (backspace)</td>
    <td>退格 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00001001</td>
    <td>9 </td>
    <td>09</td>
    <td>HT (horizontal tab)</td>
    <td>水平制表符 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00001010</td>
    <td>10 </td>
    <td>0A </td>
    <td>LF (NL line feed, new line)</td>
    <td>换行键 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00001011</td>
    <td>11 </td>
    <td>0B </td>
    <td>VT (vertical tab)</td>
    <td>垂直制表符 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00001100</td>
    <td>12 </td>
    <td>0C </td>
    <td>FF (NP form feed, new page)</td>
    <td>换页键 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00001101</td>
    <td>13</td>
    <td>0D </td>
    <td>CR (carriage return) </td>
    <td>回车键 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00001110</td>
    <td>14</td>
    <td>0E </td>
    <td>SO (shift out)</td>
    <td>不用切换 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00001111</td>
    <td>15</td>
    <td>0F </td>
    <td>SI (shift in)</td>
    <td>启用切换 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00010000</td>
    <td>16 </td>
    <td>10</td>
    <td>DLE (data link escape) </td>
    <td>数据链路转义 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00010001</td>
    <td>17</td>
    <td>11 </td>
    <td>DC1 (device control 1) </td>
    <td>设备控制1</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00010010</td>
    <td>18</td>
    <td>12 </td>
    <td>DC2 (device control 2)</td>
    <td>设备控制2</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00010011</td>
    <td>19 </td>
    <td>13</td>
    <td>DC3 (device control 3) </td>
    <td>设备控制3</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00010100</td>
    <td>20</td>
    <td>14 </td>
    <td>DC4 (device control 4)</td>
    <td>设备控制4 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00010101</td>
    <td>21</td>
    <td>15 </td>
    <td>NAK (negative acknowledge) </td>
    <td>拒绝接收 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00010110</td>
    <td>22</td>
    <td>16 </td>
    <td>SYN (synchronous idle) </td>
    <td>同步空闲 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00010111</td>
    <td>23 </td>
    <td>17</td>
    <td>ETB (end of trans. block)</td>
    <td>传输块结束 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00011000</td>
    <td>24 </td>
    <td>18</td>
    <td>CAN (cancel) </td>
    <td>取消 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00011001</td>
    <td>25 </td>
    <td>19</td>
    <td>EM (end of medium)</td>
    <td>介质中断 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00011010</td>
    <td>26 </td>
    <td>1A</td>
    <td>SUB (substitute)</td>
    <td>替补 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00011011</td>
    <td>27 </td>
    <td>1B</td>
    <td>ESC (escape) </td>
    <td>溢出 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00011100</td>
    <td>28 </td>
    <td>1C</td>
    <td>FS (file separator) </td>
    <td>文件分割符 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00011101</td>
    <td>29 </td>
    <td>1D</td>
    <td>GS (group separator) </td>
    <td>分组符 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00011110</td>
    <td>30 </td>
    <td>1E </td>
    <td>RS (record separator) </td>
    <td>记录分离符 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00011111</td>
    <td>31 </td>
    <td>1F</td>
    <td>US (unit separator)</td>
    <td>单元分隔符 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00100000</td>
    <td>32 </td>
    <td>20</td>
    <td>(space)</td>
    <td>空格 </td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00100001</td>
    <td>33 </td>
    <td>21 </td>
    <td>!</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00100010</td>
    <td>34</td>
    <td>22 </td>
    <td>"</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00100011</td>
    <td>35 </td>
    <td>23</td>
    <td>#</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00100100</td>
    <td>36 </td>
    <td>24</td>
    <td>$</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00100101</td>
    <td>37 </td>
    <td>25</td>
    <td>%</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00100110</td>
    <td>38 </td>
    <td>26</td>
    <td>&amp;</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00100111</td>
    <td>39 </td>
    <td>27 </td>
    <td>'</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00101000</td>
    <td>40 </td>
    <td>28</td>
    <td>(</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00101001</td>
    <td>41</td>
    <td>29</td>
    <td>)</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00101010</td>
    <td>42 </td>
    <td>2A</td>
    <td>*</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00101011</td>
    <td>43</td>
    <td>2B</td>
    <td>+</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00101100</td>
    <td>44 </td>
    <td>2C </td>
    <td>,</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00101101</td>
    <td>45 </td>
    <td>2D</td>
    <td>-</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00101110</td>
    <td>46 </td>
    <td>2E </td>
    <td>.</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00101111</td>
    <td>47 </td>
    <td>2F</td>
    <td>/ </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00110000</td>
    <td>48 </td>
    <td>30</td>
    <td>0</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00110001</td>
    <td>49 </td>
    <td>31</td>
    <td>1 </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00110010</td>
    <td>50 </td>
    <td>32 </td>
    <td>2</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00110011</td>
    <td>51 </td>
    <td>33</td>
    <td>3 </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00110100</td>
    <td>52 </td>
    <td>34 </td>
    <td>4</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00110101</td>
    <td>53 </td>
    <td>35</td>
    <td>5 </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00110110</td>
    <td>54</td>
    <td>36</td>
    <td>6</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00110111</td>
    <td>55 </td>
    <td>37 </td>
    <td>7 </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00111000</td>
    <td>56 </td>
    <td>38</td>
    <td>8 </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00111001</td>
    <td>57 </td>
    <td>39 </td>
    <td>9</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00111010</td>
    <td>58 </td>
    <td>3A</td>
    <td>: </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00111011</td>
    <td>59</td>
    <td>3B</td>
    <td>;</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00111100</td>
    <td>60 </td>
    <td>3C</td>
    <td>&lt; </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00111101</td>
    <td>61</td>
    <td>3D</td>
    <td>=</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00111110</td>
    <td>62 </td>
    <td>3E</td>
    <td>&gt; </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>00111111</td>
    <td>63 </td>
    <td>3F </td>
    <td>?</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01000000</td>
    <td>64 </td>
    <td>40</td>
    <td>@ </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01000001</td>
    <td>65</td>
    <td>41</td>
    <td>A</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01000010</td>
    <td>66 </td>
    <td>42 </td>
    <td>B </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01000011</td>
    <td>67</td>
    <td>43</td>
    <td>C</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01000100</td>
    <td>68 </td>
    <td>44 </td>
    <td>D </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01000101</td>
    <td>69</td>
    <td>45</td>
    <td>E</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01000110</td>
    <td>70</td>
    <td>46 </td>
    <td>F</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01000111</td>
    <td>71</td>
    <td>47</td>
    <td>G</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01001000</td>
    <td>72 </td>
    <td>48</td>
    <td>H </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01001001</td>
    <td>73</td>
    <td>49</td>
    <td>I</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01001010</td>
    <td>74 </td>
    <td>4A</td>
    <td>J </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01001011</td>
    <td>75</td>
    <td>4B</td>
    <td>K</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01001100</td>
    <td>76 </td>
    <td>4C </td>
    <td>L </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01001101</td>
    <td>77</td>
    <td>4D</td>
    <td>M</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01001110</td>
    <td>78 </td>
    <td>4E</td>
    <td>N </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01001111</td>
    <td>79</td>
    <td>4F</td>
    <td>O</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01010000</td>
    <td>80 </td>
    <td>50</td>
    <td>P </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01010001</td>
    <td>81</td>
    <td>51</td>
    <td>Q</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01010010</td>
    <td>82</td>
    <td>52 </td>
    <td>R</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01010011</td>
    <td>83</td>
    <td>53</td>
    <td>S</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01010100</td>
    <td>84 </td>
    <td>54</td>
    <td>T </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01010101</td>
    <td>85 </td>
    <td>55 </td>
    <td>U</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01010110</td>
    <td>86 </td>
    <td>56</td>
    <td>V </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01010111</td>
    <td>87 </td>
    <td>57</td>
    <td>W</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01011000</td>
    <td>88 </td>
    <td>58</td>
    <td>X </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01011001</td>
    <td>89</td>
    <td>59 </td>
    <td>Y</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01011010</td>
    <td>90 </td>
    <td>5A</td>
    <td>Z </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01011011</td>
    <td>91 </td>
    <td>5B</td>
    <td>[ </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01011100</td>
    <td>92</td>
    <td>5C</td>
    <td>\</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01011101</td>
    <td>93 </td>
    <td>5D</td>
    <td>] </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01011110</td>
    <td>94</td>
    <td>5E </td>
    <td>^</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01011111</td>
    <td>95 </td>
    <td>5F</td>
    <td>_</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01100000</td>
    <td>96 </td>
    <td>60</td>
    <td>` </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01100001</td>
    <td>97</td>
    <td>61 </td>
    <td>a</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01100010</td>
    <td>98 </td>
    <td>62</td>
    <td>b </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01100011</td>
    <td>99 </td>
    <td>63</td>
    <td>c </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01100100</td>
    <td>100</td>
    <td>64</td>
    <td>d</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01100101</td>
    <td>101 </td>
    <td>65</td>
    <td>e </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01100110</td>
    <td>102 </td>
    <td>66</td>
    <td>f</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01100111</td>
    <td>103 </td>
    <td>67</td>
    <td>g </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01101000</td>
    <td>104 </td>
    <td>68 </td>
    <td>h</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01101001</td>
    <td>105 </td>
    <td>69</td>
    <td>i </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01101010</td>
    <td>106</td>
    <td>6A</td>
    <td>j</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01101011</td>
    <td>107 </td>
    <td>6B</td>
    <td>k </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01101100</td>
    <td>108 </td>
    <td>6C </td>
    <td>l</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01101101</td>
    <td>109 </td>
    <td>6D </td>
    <td>m</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01101110</td>
    <td>110</td>
    <td>6E</td>
    <td>n</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01101111</td>
    <td>111 </td>
    <td>6F</td>
    <td>o </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01110000</td>
    <td>112 </td>
    <td>70 </td>
    <td>p</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01110001</td>
    <td>113 </td>
    <td>71</td>
    <td>q </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01110010</td>
    <td>114 </td>
    <td>72 </td>
    <td>r</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01110011</td>
    <td>115 </td>
    <td>73</td>
    <td>s </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01110100</td>
    <td>116 </td>
    <td>74 </td>
    <td>t</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01110101</td>
    <td>117 </td>
    <td>75 </td>
    <td>u</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01110110</td>
    <td>118 </td>
    <td>76</td>
    <td>v</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01110111</td>
    <td>119 </td>
    <td>77</td>
    <td>w </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01111000</td>
    <td>120 </td>
    <td>78</td>
    <td>x</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01111001</td>
    <td>121 </td>
    <td>79</td>
    <td>y </td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01111010</td>
    <td>122 </td>
    <td>7A </td>
    <td>z</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01111011</td>
    <td>123 </td>
    <td>7B</td>
    <td>{</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01111100</td>
    <td>124 </td>
    <td>7C</td>
    <td>|</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01111101</td>
    <td>125 </td>
    <td>7D</td>
    <td>}</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01111110</td>
    <td>126 </td>
    <td>7E </td>
    <td>~</td>
    <td>&nbsp;</td>
  </tr>
  <tr bgcolor="EFF7F0">
    <td>01111111</td>
    <td>127 </td>
    <td>7F </td>
    <td>DEL (delete)</td>
    <td>删除 </td>
  </tr>
</tbody></table></div><p></p>
<a name="a3"></a>
<h3>第三部分：扩展ASCII打印字符</h3>
<p>扩展的ASCII字符满足了对更多字符的需求。扩展的ASCII包含ASCII中已有的128个字符（数字0–32显示在下图中），又增加了128个字符，总共是256个。即使有了这些更多的字符，许多语言还是包含无法压缩到256个字符中的符号。因此，出现了一些ASCII的变体来囊括地区性字符和符号。例如，许多软件程序把ASCII表（又称作ISO8859-1）用于北美、西欧、澳大利亚和非洲的语言。</p>
<p><img src="http://www.asciima.com/img/ascii127-255.jpg"></p>
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出处：

http://www1.tc711.com/tool/BASE64.htm

http://www.asciima.com/

posted on 2015-11-19 14:32 jack_Meng 阅读(8515) 评论(0) 编辑收藏举报

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