JS 文字符串转换unicode编码函数

function uniencode(text) 
{ 
text = escape(text.toString()).replace(/\+/g, "%2B"); 
var matches = text.match(/(%([0-9A-F]{2}))/gi); 
if (matches) 
{ 
for (var matchid = 0; matchid < matches.length; matchid++) 
{ 
var code = matches[matchid].substring(1,3); 
if (parseInt(code, 16) >= 128) 
{ 
text = text.replace(matches[matchid], '%u00' + code); 
} 
} 
} 
text = text.replace('%25', '%u0025'); 
return text; 
}

function convert_int_to_utf8($intval) 
{ 
$intval = intval($intval); 
switch ($intval) 
{ 
// 1 byte, 7 bits 
case 0: 
return chr(0); 
case ($intval & 0x7F): 
return chr($intval); 
// 2 bytes, 11 bits 
case ($intval & 0x7FF): 
return chr(0xC0 | (($intval >> 6) & 0x1F)) . 
chr(0x80 | ($intval & 0x3F)); 
// 3 bytes, 16 bits 
case ($intval & 0xFFFF): 
return chr(0xE0 | (($intval >> 12) & 0x0F)) . 
chr(0x80 | (($intval >> 6) & 0x3F)) . 
chr (0x80 | ($intval & 0x3F)); 
// 4 bytes, 21 bits 
case ($intval & 0x1FFFFF): 
return chr(0xF0 | ($intval >> 18)) . 
chr(0x80 | (($intval >> 12) & 0x3F)) . 
chr(0x80 | (($intval >> 6) & 0x3F)) . 
chr(0x80 | ($intval & 0x3F)); 
} 
}