js把编码转换成 gb2312编码

//把编码转换成 gb2312编码
    function UrlEncode(str)
    {
     var i, c, ret="", strSpecial="!\"#$%&'()*+,/:;<=>?@[\]^`{|}~%";
     for(i = 0; i < str.length; i++)
     {
     //alert(str.charCodeAt(i));

     c = str.charAt(i);
     if(c==" ")
     ret+="+";
     else if(strSpecial.indexOf(c)!=-1)
     ret += "%" + str.charCodeAt(i).toString(16);
     if(z[str.charCodeAt(i)]　!= null)
     {
     d = z[str.charCodeAt(i)];
     try
     {
     ret += "%" + d.slice(0,2) + "%" + d.slice(-2);
     }
     catch (e)
     {
     alert(" $$ error name = " + e.name + ", message = " +e.message + ", d " + i + "= " + str.charCodeAt(i))
     }
     }
     else
     ret += c;
     }
     return ret;
     }

     function getSpell(str, sp)
     {
     var i, c, t, ret="";
     if(sp == null)
     sp="";

     for(i = 0; i < str.length; i++)
     {
     if(str.charCodeAt(i) >= 0x4e00)
     {
     c = parseInt(z[str.charCodeAt(i)], 16);
     if(c < 55290)
     {
     for(t = qswhSpell.length-1; t > 0; t = t - 2)
     if(qswhSpell[t] <= c)
     break;
     if(t > 0)
     ret += qswhSpell[t - 1] + sp;
     }
     }
     } a
     return ret.substr(0, ret.length-sp.length);
    }

补充：web前端 , JavaScript ,