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) {
         //if ((!strJson) || strJson == "") return "";
         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;
         }
     }
 });