You can try this:

<script type="text/javascript" language="javascript">
    //disables scrolling on mouse over of <select> elements
    $(document).ready(function() {
        $('select').each(function() {
            $(this).on('mousewheel', function(){
                return false;
            });
        });
    });
</script>

onmousewheel 并不是 SELECT HTML 元素的真正属性。见http://www.w3schools.com/tags/tag_select.asp

您正在尝试设置鼠标事件。http://www.w3schools.com/tags/ref_eventattributes.asp

您可以按照 MISJHA 指出的方式实现这一目标。

try removeAttr. It removes the attached DOM attribute