数组的增删

数据对象的增删

        //元素添加或者删除
       var obj = function(obj,type,user){
            var o  =  {};
            var k  =  1;
            if(type  == 1){
                for(var i in obj){
                    o[k] = obj[i];
                    k++;
                }
                o[k] = user;
                return o;
            }else{
                for(var i in obj){
                    if(obj[i] != user){
                        o[k]  = obj[i];
                        k++;
                    }
                }
                return o;
            }
        }