1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2 <html xmlns="http://www.w3.org/1999/xhtml">
3 <head>
4 <title></title>
5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
6 <style type="text/css">
7 <!--
8 body{
9 margin:0px;
10 padding:0px;
11 }
12 body,td{
13 font-size:9pt;
14 }
15 -->
16 </style>
17 <script type="text/javascript">
18 <!--
19 var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
20 //将Ansi编码的字符串进行Base64编码
21 function encode64(input) {
22 var output = "";
23 var chr1, chr2, chr3 = "";
24 var enc1, enc2, enc3, enc4 = "";
25 var i = 0;
26 do {
27 chr1 = input.charCodeAt(i++);
28 chr2 = input.charCodeAt(i++);
29 chr3 = input.charCodeAt(i++);
30 enc1 = chr1 >> 2;
31 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
32 enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
33 enc4 = chr3 & 63;
34 if (isNaN(chr2)) {
35 enc3 = enc4 = 64;
36 } else if (isNaN(chr3)) {
37 enc4 = 64;
38 }
39 output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2)
40 + keyStr.charAt(enc3) + keyStr.charAt(enc4);
41 chr1 = chr2 = chr3 = "";
42 enc1 = enc2 = enc3 = enc4 = "";
43 } while (i < input.length);
44 return output;
45 }
46 //将Base64编码字符串转换成Ansi编码的字符串
47 function decode64(input) {
48 var output = "";
49 var chr1, chr2, chr3 = "";
50 var enc1, enc2, enc3, enc4 = "";
51 var i = 0;
52 if (input.length % 4 != 0) {
53 return "";
54 }
55 var base64test = /[^A-Za-z0-9\+\/\=]/g;
56 if (base64test.exec(input)) {
57 return "";
58 }
59 do {
60 enc1 = keyStr.indexOf(input.charAt(i++));
61 enc2 = keyStr.indexOf(input.charAt(i++));
62 enc3 = keyStr.indexOf(input.charAt(i++));
63 enc4 = keyStr.indexOf(input.charAt(i++));
64 chr1 = (enc1 << 2) | (enc2 >> 4);
65 chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
66 chr3 = ((enc3 & 3) << 6) | enc4;
67 output = output + String.fromCharCode(chr1);
68 if (enc3 != 64) {
69 output += String.fromCharCode(chr2);
70 }
71 if (enc4 != 64) {
72 output += String.fromCharCode(chr3);
73 }
74 chr1 = chr2 = chr3 = "";
75 enc1 = enc2 = enc3 = enc4 = "";
76 } while (i < input.length);
77 return output;
78 }
79 function utf16to8(str) {
80 var out, i, len, c;
81 out = "";
82 len = str.length;
83 for(i = 0; i < len; i++) {
84 c = str.charCodeAt(i);
85 if ((c >= 0x0001) && (c <= 0x007F)) {
86 out += str.charAt(i);
87 } else if (c > 0x07FF) {
88 out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
89 out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
90 out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
91 } else {
92 out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
93 out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
94 }
95 }
96 return out;
97 }
98 function utf8to16(str) {
99 var out, i, len, c;
100 var char2, char3;
101 out = "";
102 len = str.length;
103 i = 0;
104 while(i < len) {
105 c = str.charCodeAt(i++);
106 switch(c >> 4) {
107 case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
108 // 0xxxxxxx
109 out += str.charAt(i-1);
110 break;
111 case 12: case 13:
112 // 110x xxxx 10xx xxxx
113 char2 = str.charCodeAt(i++);
114 out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
115 break;
116 case 14:
117 // 1110 xxxx 10xx xxxx 10xx xxxx
118 char2 = str.charCodeAt(i++);
119 char3 = str.charCodeAt(i++);
120 out += String.fromCharCode(((c & 0x0F) << 12) |
121 ((char2 & 0x3F) << 6) |
122 ((char3 & 0x3F) << 0));
123 break;
124 }
125 }
126 return out;
127 }
128 // 测试代码 开始
129 var de = encode64(utf16to8("你好世界"));
130 document.writeln(de+"<br>");
131 var ee = utf8to16(decode64(de))
132 document.writeln(ee);
133 // 测试代码 结束
134 //-->
135 </script>
136 </head>
137 <body>
138 </body>
139 </html>
