标题：解决：Ajax utf-8中文乱码问题
出处：运维进行时
时间：Thu, 22 May 2008 22:04:54 +0000
作者：root
地址：https://blog.liuts.com/post/139/

内容：
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 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 "";
}

客户端
prototype框架，代码片断：

var url = '/system/do/'+encodeURI(encodeURI(currvalue));
url=EncodeUtf8(url);
var myAjax = new Ajax.Request(
url,
{
method: 'post',
onComplete: showResponse
});

注：
1、此处一定要两次编码encodeURI(encodeURI
2、然后将编码的结果转成UTF-8
如不这样做，中文到服务器端将成“??????”的字符。
服务器端
$constr=urldecode(urldecode($constr));
同样也需要进行两次解码：）


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