 jQuery.extend(
 {
  /**
   * @see  将json字符串转换为对象
   * @param   json字符串
   * @return 返回object,array,string等对象
   */
  evalJSON : function (strJson)
  {
   return eval( "(" + strJson + ")");
  }
 });
 jQuery.extend(
 {
  /**
   * @see  将javascript数据类型转换为json字符串
   * @param 待转换对象,支持object,array,string,function,number,boolean,regexp
   * @return 返回json字符串
   */
  toJSON : function (object)
  {
   var type = typeof object;
   if ('object' == type)
   {
    if (Array == object.constructor)
     type = 'array';
    else if (RegExp == object.constructor)
     type = 'regexp';
    else
     type = 'object';
   }
      switch(type)
   {
         case 'undefined':
       case 'unknown': 
     return;
     break;
    case 'function':
       case 'boolean':
    case 'regexp':
     return object.toString();
     break;
    case 'number':
     return isFinite(object) ? object.toString() : 'null';
       break;
    case 'string':
     return '"' + object.replace(/(\\|\")/g,"\\$1").replace(/\n|\r|\t/g,
       function(){   
                 var a = arguments[0];                   
        return  (a == '\n') ? '\\n':   
                       (a == '\r') ? '\\r':   
                       (a == '\t') ? '\\t': ""  
             }) + '"';
     break;
    case 'object':
     if (object === null) return 'null';
        var results = [];
        for (var property in object) {
          var value = jQuery.toJSON(object[property]);
          if (value !== undefined)
            results.push(jQuery.toJSON(property) + ':' + value);
        }
        return '{' + results.join(',') + '}';
     break;
    case 'array':
     var results = [];
        for(var i = 0; i < object.length; i++)
     {
      var value = jQuery.toJSON(object[i]);
           if (value !== undefined) results.push(value);
     }
        return '[' + results.join(',') + ']';
     break;
      }
  }
 });