JS中文字符串和UTF-8编码字符串相互转换

JS中文字符串和UTF-8编码字符串相互转换

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 "";
}

var test = EncodeUtf8("中国");
alert("中国-----"+test);
</script>
<script language="JavaScript">
//字符串替换函数,全部替换
function strReplaceAll(str,oldStr,newStr){
var regS = new RegExp(oldStr,"gi");
newStr = str.replace(regS,newStr);
return newStr;
}
</script>

<script>
//UTF-8编码的汉字转换为字符，特殊字符未处理，
function   chineseFromUtf8Url(strUtf8)
{
var   bstr   =   "";
var   nOffset   =   0; //   processing   point   on   strUtf8

if(   strUtf8   ==   ""   )
return   "";

strUtf8   =   strUtf8.toLowerCase();
nOffset   =   strUtf8.indexOf("%e");
if(   nOffset   ==   -1   )
return   strUtf8;

while(   nOffset   !=   -1   )
{
bstr   +=   strUtf8.substr(0,   nOffset);
strUtf8   =   strUtf8.substr(nOffset,   strUtf8.length   -   nOffset);
if(   strUtf8   ==   ""   ||   strUtf8.length   <   9   )       //   bad   string
return   bstr;

bstr   +=   utf8CodeToChineseChar(strUtf8.substr(0,   9));
strUtf8   =   strUtf8.substr(9,   strUtf8.length   -   9);
nOffset   =   strUtf8.indexOf("%e");
}

return   bstr   +   strUtf8;
}

function   unicodeFromUtf8(strUtf8)
{
var   bstr   =   "";
var   nTotalChars   =   strUtf8.length; //   total   chars   to   be   processed.
var   nOffset   =   0; //   processing   point   on   strUtf8
var   nRemainingBytes   =   nTotalChars; //   how   many   bytes   left   to   be   converted
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var   nOutputPosition   =   0;
var   iCode,   iCode1,   iCode2; //   the   value   of   the   unicode.

while   (nOffset   <   nTotalChars)
{
iCode   =   strUtf8.charCodeAt(nOffset);
if   ((iCode   &   0x80)   ==   0) //   1   byte.
{
if   (   nRemainingBytes   <   1   ) //   not   enough   data
break;

bstr   +=   String.fromCharCode(iCode   &   0x7F);
nOffset   ++;
nRemainingBytes   -=   1;
}
else   if   ((iCode   &   0xE0)   ==   0xC0) //   2   bytes
{
iCode1   =     strUtf8.charCodeAt(nOffset   +   1);
if   (   nRemainingBytes   <   2   || //   not   enough   data
(iCode1   &   0xC0)   !=   0x80   ) //   invalid   pattern
{
break;
}

bstr   +=   String.fromCharCode(((iCode   &   0x3F)   <<   6)   |   (   iCode1   &   0x3F));
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));
}

var test ="%3CHTML%3E %3CHEAD%3E %3CCENTER%3E %3CH1%3EEncountered an NDS error while updating the new password. %3CP%3EPlease contact the system administrator. %3C/H1%3E %3C/CENTER%3E %3C/HEAD%3E %3C/HTML%3E";

//替换掉中文字符串中的括号“<>”
test = strReplaceAll(test,"%3C","<");
test = strReplaceAll(test,"%3E",">");

alert(chineseFromUtf8Url("%3CHTML%3E %3CHEAD%3E %3CCENTER%3E %3CH1%3EEncountered an NDS error while updating the new password. %3CP%3EPlease contact the system administrator. %3C/H1%3E %3C/CENTER%3E %3C/HEAD%3E %3C/HTML%3E------"+test))

</script>

<script language="javascript">
//替换所有字符
function replace(str,a,b)
{
var i;
var s2 = str;

while(s2.indexOf(a)>0)
{
i = s2.indexOf(a);
s2 = s2.substring(0, i) + b
+ s2.substring(i + 2, s2.length);
}
return s2;
}
</script>