将表单你序列化为json对象

    $.fn.serializeJson=function(){  
            var serializeObj={};  
            var array=this.serializeArray();  
            var str=this.serialize();  
            $(array).each(function(){  
                if(serializeObj[this.name]){  
                    if($.isArray(serializeObj[this.name])){  
                        serializeObj[this.name].push(this.value);  
                    }else{  
                        serializeObj[this.name]=[serializeObj[this.name],this.value];  
                    }  
                }else{  
                    serializeObj[this.name]=this.value;   
                }  
            });  
            return serializeObj;  
        };