jquery 질문

$('.view_item').mouseover( function (){
    var view_item_id = $(this).attr('id');
    var view_item_idx = $(this).attr('idx');
    var mc_survey_type_idx = $('#mc_survey_type_'+view_item_idx).val();

    $( "#"+view_item_id ).hover(
    function() {
        $( this ).css( 'box-shadow', '0px 0px 5px rgba(0,0,0,0.2)' );
        $("#q_plus"+view_item_idx).show();

        $( ".q"+mc_survey_type_idx+"_title_list" ).click( function(){
            chk_change3(view_item_idx);
        });

        $("#additi1_"+view_item_idx).click(function(){
            var total = $('#total').val();
            var this_num = $('#mc_left_num_'+view_item_idx).val();

            $('#question_type').val('single');
            var new_type = 'single';
            var poll_idx = $('#poll_idx').val();

            open_list4(poll_idx, new_type, this_num, total);

        });

    }, function() {
        $( this ).css( 'box-shadow', '' );
        $("#q_plus"+view_item_idx).hide();
    });

});

function open_list4(poll_idx, next_type, num, now_total){
    // list 보기 
    //console.log(poll_idx+", "+next_type+", "+num+", "+now_total);
    var question_type = $('#question_type').val();

    var next_num = Number(num) + Number("1");
    var plus_total = Number(now_total) + Number("1");
    var plus_num = Number(num) + Number("2");
    var plus_nums = Number(num) + Number("2");
    var x = "";
    var y = "";
    for( x = next_num; x <= now_total; x++ ){
        $('#view_item'+x).attr("idx",plus_num);
        plus_num++;
    }
    //console.log("next_num = "+next_num);
    //console.log("now_total = "+now_total);

    var z = now_total;
    for( y = plus_total; y >= next_num; y-- ){
        
        var view_item_idx = $('#view_item'+z).attr('idx');
        var view_item_name = "view_item"+view_item_idx;
        if(y == view_item_idx){
            console.log(y+" = "+view_item_idx);
            //console.log("view_item_name = "+view_item_name);
            //console.log('#view_item'+y);
            $('#view_item'+z).attr("id",view_item_name);
            z--;
        }
        
        plus_nums++;
    }

}