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;
    }
    console.log(EncodeUtf8('哈哈哈'));
    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 "";
    }