function paramString2obj (serializedParams) {

   var obj={};

   function evalThem (str) {

       var attributeName = str.split("=")[0];

       var attributeValue = str.split("=")[1];

       if(!attributeValue){

           return ;

       }

       var array = attributeName.split(".");

       for (var i = 1; i < array.length; i++) {

           var tmpArray = Array();

           tmpArray.push("obj");

           for (var j = 0; j < i; j++) {

               tmpArray.push(array[j]);

           };

           var evalString = tmpArray.join(".");

           if(!eval_r(evalString)){

               eval_r(evalString+"={};");               

           }

       };

       eval_r("obj."+attributeName+"='"+attributeValue+"';");

   };

   var properties = serializedParams.split("&");

   for (var i = 0; i < properties.length; i++) {

       evalThem(properties[i]);

   };

   return obj;

}

$.fn.form2json = function(){

   var serializedParams = this.serialize();

   var obj = paramString2obj(serializedParams);

   return JSON.stringify(obj);

};

 

使用方法

var json = $("#testform").form2json();

alert(json);