网页知识:把中文字符转换成Utf8编码

//--------把中文字符转换成Utf8编码------------------------//
function EncodeUtf8(s1)
{
var s = escape(s1);
var sa = s.split("%");
var retV ="";
if(sa[0] != "")
{
retV = sa[0];
}
for(var i = 1; i < sa.length; i )
{
if(sa[i].substring(0,1) == "u")
{
retV = Hex2Utf8(Str2Hex(sa[i].substring(1,5)));

}
else retV = "%" sa[i];
}

return retV;
}
function Str2Hex(s)
{
var c = "";
var n;
var ss = "0123456789ABCDEF";
var digS = "";
for(var i = 0; i < s.length; i )
{
c = s.charAt(i);
n = ss.indexOf(c);
digS = Dec2Dig(eval(n));

}
//return value;
return digS;
}
function Dec2Dig(n1)
{
var s = "";
var n2 = 0;
for(var i = 0; i < 4; i )
{
n2 = Math.pow(2,3 - i);
if(n1 >= n2)
{
s = ’1’;
n1 = n1 - n2;
}
else
s = ’0’;

}
return s;

}
function Dig2Dec(s)
{
var retV = 0;
if(s.length == 4)
{
for(var i = 0; i < 4; i )
{
retV = eval(s.charAt(i)) * Math.pow(2, 3 - i);
}
return retV;
}
return -1;
} 
function Hex2Utf8(s)
{
var retS = "";
var tempS = "";
var ss = "";
if(s.length == 16)
{
tempS = "1110" s.substring(0, 4);
tempS = "10" s.substring(4, 10); 
tempS = "10" s.substring(10,16); 
var sss = "0123456789ABCDEF";
for(var i = 0; i < 3; i )
{
retS = "%";
ss = tempS.substring(i * 8, (eval(i) 1)*8);

retS = sss.charAt(Dig2Dec(ss.substring(0,4)));
retS = sss.charAt(Dig2Dec(ss.substring(4,8)));
}
return retS;
}
return "";
}