• 将JS对象序列化为JSON字符串
• @param {Mixed} o The variable to decode
• @return {String} The JSON string
• String json = $.encode(o);
  */
  $.encode = (function() {
  if ( typeof(JSON)!=='undefined' && typeof(JSON.stringify)!=='undefined') {
  return JSON.stringify;
  }
  var I = !!{}.hasOwnProperty, = function(I) {
  return I < 10 ? "0" + I : I;
  },A = {
  "\b" : "\b","\t" : "\t","\n" : "\n","\f" : "\f","\r" : "\r","\"" : "\\"","\" : "\\"
  };
  return (function(C) {
  if (typeof C == "undefined" || C === null) {
  return "null";
  } else {
  if (Object.prototype.toString.call(C) === "[object Array]") {
  var B = ["["],G,E,D = C.length,F;
  for (E = 0; E < D; E += 1) {
  F = C[E];
  switch (typeof F) {
  case "undefined" :
  case "function" :
  case "unknown" :
  break;
  default :
  if (G) {
  B.push(",");
  }
  B.push(F === null ? "null" : $.encode(F));
  G = true;
  }
  }
  B.push("]");
  return B.join("");
  } else {
  if ((Object.prototype.toString.call(C) === "[object Date]")) {
  return "\"" + C.getFullYear() + "-" + (C.getMonth() + 1) + "-" + (C.getDate()) + "T" + (C.getHours()) + ":" + (C.getMinutes()) + ":" + (C.getSeconds()) + "\"";
  } else {
  if (typeof C == "string") {
  return "\"" + C.replace(/([\x00-\x1f\"])/g,function(B,) {
  var I = A[];
  if (I) {
  return I;
  }
  return '';
  }).replace(/[^\u0000-\u00FF]/g,function($0) {
  return escape($0).replace(/(%u)(\w{4})/gi,"\u$2")
  }) + "\"";
  } else {
  if (typeof C == "number") {
  return isFinite(C) ? String(C) : "null";
  } else {
  if (typeof C == "boolean") {
  return String(C);
  } else {
  B = ["{"],F;
  for (E in C) {
  if (!I || C.hasOwnProperty(E)) {
  F = C[E];
  if (F === null) {
  continue;
  }
  switch (typeof F) {
  case "undefined" :
  case "function" :
  case "unknown" :
  break;
  default :
  if (G) {
  B.push(",");
  }
  B.push($.encode(E),":",$.encode(F));
  G = true;
  }
  }
  }
  B.push("}");
  return B.join("");
  }
  }
  }
  }
  }
  }
  });
  })();

return obj ;
}