javascript 编码解码
解决了对中文的不支持问题.
先用escape()对中文进行编码.然后再进行base64编码.
解码时,再加入unescape()对中文进行解码.
< html >
< head >
< title > base64 Encoding/Decoding </ title >
</ head >
< script type ="text/javascript" > <!--
var keyStr = " ABCDEFGHIJKLMNOP " +
" QRSTUVWXYZabcdef " +
" ghijklmnopqrstuv " +
" wxyz0123456789+/ " +
" = " ;
function encode64(input) {
input = escape(input);
var output = "" ;
var chr1, chr2, chr3 = "" ;
var enc1, enc2, enc3, enc4 = "" ;
var i = 0 ;
do {
chr1 = input.charCodeAt(i ++ );
chr2 = input.charCodeAt(i ++ );
chr3 = input.charCodeAt(i ++ );
enc1 = chr1 >> 2 ;
enc2 = ((chr1 & 3 ) << 4 ) | (chr2 >> 4 );
enc3 = ((chr2 & 15 ) << 2 ) | (chr3 >> 6 );
enc4 = chr3 & 63 ;
if (isNaN(chr2)) {
enc3 = enc4 = 64 ;
} else if (isNaN(chr3)) {
enc4 = 64 ;
}
output = output +
keyStr.charAt(enc1) +
keyStr.charAt(enc2) +
keyStr.charAt(enc3) +
keyStr.charAt(enc4);
chr1 = chr2 = chr3 = "" ;
enc1 = enc2 = enc3 = enc4 = "" ;
} while (i < input.length);
return output;
}
function decode64(input) {
var output = "" ;
var chr1, chr2, chr3 = "" ;
var enc1, enc2, enc3, enc4 = "" ;
var i = 0 ;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
var base64test = / [ ^ A - Za - z0 - 9 \ + \ / \ = ] / g;
if (base64test.exec(input)) {
alert( " There were invalid base64 characters in the input text.\n " +
" Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n " +
" Expect errors in decoding. " );
}
input = input.replace( / [ ^ A - Za - z0 - 9 \ + \ / \ = ] / g, "" );
do {
enc1 = keyStr.indexOf(input.charAt(i ++ ));
enc2 = keyStr.indexOf(input.charAt(i ++ ));
enc3 = keyStr.indexOf(input.charAt(i ++ ));
enc4 = keyStr.indexOf(input.charAt(i ++ ));
chr1 = (enc1 << 2 ) | (enc2 >> 4 );
chr2 = ((enc2 & 15 ) << 4 ) | (enc3 >> 2 );
chr3 = ((enc3 & 3 ) << 6 ) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64 ) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64 ) {
output = output + String.fromCharCode(chr3);
}
chr1 = chr2 = chr3 = "" ;
enc1 = enc2 = enc3 = enc4 = "" ;
} while (i < input.length);
return unescape(output);
}
// --></script>
< body >
< form name = " base64Form " >
Type in the message you want to encode in base64, or paste < br >
base64 encoded text into the text field, select Encode or Decode, < br >
and click the button !< br >
< textarea name = " theText " cols = " 40 " rows = " 6 " ></ textarea >< br >
< input type = " button " name = " encode " value = " Encode to base64 "
onClick = " document．base64Form.theText.value=encode64(document．base64Form.theText.value); " >
< input type = " button " name = " decode " value = " Decode from base64 "
onClick = " document．base64Form.theText.value=decode64(document．base64Form.theText.value); " >
</ form >
</ body >
</ html >
先用escape()对中文进行编码.然后再进行base64编码.
解码时,再加入unescape()对中文进行解码.
< html >
< head >
< title > base64 Encoding/Decoding </ title >
</ head >
< script type ="text/javascript" > <!--
var keyStr = " ABCDEFGHIJKLMNOP " +
" QRSTUVWXYZabcdef " +
" ghijklmnopqrstuv " +
" wxyz0123456789+/ " +
" = " ;
function encode64(input) {
input = escape(input);
var output = "" ;
var chr1, chr2, chr3 = "" ;
var enc1, enc2, enc3, enc4 = "" ;
var i = 0 ;
do {
chr1 = input.charCodeAt(i ++ );
chr2 = input.charCodeAt(i ++ );
chr3 = input.charCodeAt(i ++ );
enc1 = chr1 >> 2 ;
enc2 = ((chr1 & 3 ) << 4 ) | (chr2 >> 4 );
enc3 = ((chr2 & 15 ) << 2 ) | (chr3 >> 6 );
enc4 = chr3 & 63 ;
if (isNaN(chr2)) {
enc3 = enc4 = 64 ;
} else if (isNaN(chr3)) {
enc4 = 64 ;
}
output = output +
keyStr.charAt(enc1) +
keyStr.charAt(enc2) +
keyStr.charAt(enc3) +
keyStr.charAt(enc4);
chr1 = chr2 = chr3 = "" ;
enc1 = enc2 = enc3 = enc4 = "" ;
} while (i < input.length);
return output;
}
function decode64(input) {
var output = "" ;
var chr1, chr2, chr3 = "" ;
var enc1, enc2, enc3, enc4 = "" ;
var i = 0 ;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
var base64test = / [ ^ A - Za - z0 - 9 \ + \ / \ = ] / g;
if (base64test.exec(input)) {
alert( " There were invalid base64 characters in the input text.\n " +
" Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n " +
" Expect errors in decoding. " );
}
input = input.replace( / [ ^ A - Za - z0 - 9 \ + \ / \ = ] / g, "" );
do {
enc1 = keyStr.indexOf(input.charAt(i ++ ));
enc2 = keyStr.indexOf(input.charAt(i ++ ));
enc3 = keyStr.indexOf(input.charAt(i ++ ));
enc4 = keyStr.indexOf(input.charAt(i ++ ));
chr1 = (enc1 << 2 ) | (enc2 >> 4 );
chr2 = ((enc2 & 15 ) << 4 ) | (enc3 >> 2 );
chr3 = ((enc3 & 3 ) << 6 ) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64 ) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64 ) {
output = output + String.fromCharCode(chr3);
}
chr1 = chr2 = chr3 = "" ;
enc1 = enc2 = enc3 = enc4 = "" ;
} while (i < input.length);
return unescape(output);
}
// --></script>
< body >
< form name = " base64Form " >
Type in the message you want to encode in base64, or paste < br >
base64 encoded text into the text field, select Encode or Decode, < br >
and click the button !< br >
< textarea name = " theText " cols = " 40 " rows = " 6 " ></ textarea >< br >
< input type = " button " name = " encode " value = " Encode to base64 "
onClick = " document．base64Form.theText.value=encode64(document．base64Form.theText.value); " >
< input type = " button " name = " decode " value = " Decode from base64 "
onClick = " document．base64Form.theText.value=decode64(document．base64Form.theText.value); " >
</ form >
</ body >
</ html >