utf-8编码转换成gb2312

noffset += 2;
nremainingbytes -= 2;
}
else if ((icode & 0xf0) == 0xe0) // 3 bytes
{
icode1 = strutf8.charcodeat(noffset + 1);
icode2 = strutf8.charcodeat(noffset + 2);
if ( nremainingbytes < 3 ¦ ¦ // not enough data
(icode1 & 0xc0) != 0x80 ¦ ¦ // invalid pattern
(icode2 & 0xc0) != 0x80 )
{
break;
}

bstr += string.fromcharcode(((icode & 0x0f) << 12) ¦
((icode1 & 0x3f) << 6) ¦
(icode2 & 0x3f));
noffset += 3;
nremainingbytes -= 3;
}
else // 4 or more bytes -- unsupported
break;
}

if (nremainingbytes != 0)
{
// bad utf8 string.
return "";
}

return bstr;
}

function utf8codetochinesechar(strutf8)
{
var icode, icode1, icode2;
icode = parseint("0x" + strutf8.substr(1, 2));
icode1 = parseint("0x" + strutf8.substr(4, 2));
icode2 = parseint("0x" + strutf8.substr(7, 2));

return string.fromcharcode(((icode & 0x0f) << 12) ¦
((icode1 & 0x3f) << 6) ¦
(icode2 & 0x3f));
}
alert(chinesefromutf8url("%e6%b5%8b%e8%af%95"))
</script>[code]