foucusout没有在FF或IE上工作，但在chrome上工作

Question

Foucusout正在研究Chrome，但不是FF或IE。我已经建立了一个基本的下拉菜单，可以在点击时打开，然后关闭焦点。当我点击第二层的链接时，UL＆＃39;下拉菜单已关闭，但未转到请求的页面。 *第二级导航将在第一级导航栏悬停时打开，请参阅下面的代码。

感谢

JS

// Main Drop down Navigation 
        resources.on('click', 'a.dropdown', function (e) {

            e.preventDefault();
            var menu;

            select = $(this);
            menu = select.closest('ul');

            menu.focus().addClass('open');

        }).on('focusout', 'ul.menu', function (e) {
                select = $(this);
                select.removeClass('open');
        });

HTML

 <div class="custom-dropdown">
            <ul class="menu level0" tabindex="-1">
                <li><a class="dropdown" href="#">Please select a database</a>
                    <ul class="level1" tabindex="-1">
                <li><span>Cancer</span>
                    <ul class="level2" tabindex="-1">
                        <li><a class="noAccess" href="http://www.google.com">Cancer e-atlas</a></li>
                        <li><a href="http://www.google.com">Cancer Mortality Profile</a></li>
                        <li><a href="http://www.google.com">Cancer Patient Experience</a></li>
                        <li><a href="http://www.google.com">Cervical screening cancer e-Atlas</a></li>
                        <li><a href="http://www.google.com">GP Pratice Profiles</a></li>
                        <li><a href="#">Gynaecological Cancer Hub</a></li>
                        <li><a href="#">Gynaecological Cancer Profiles</a></li>
                        <li><a href="#">Head and Neck Cancer e-Atlas</a></li>
                        <li><a href="#">National Radiotherapy Profiles</a></li>
                        <li><a href="#">PCT Profiles</a></li>
                        <li><a href="#">Prevalence e-Atlas</a></li>
                        <li><a href="#">Profile of head and neck cancers in England</a></li>
                        <li><a href="#">Service profiles</a></li>
                        <li><a href="#">Skin Cancer Profiles</a></li>
                        <li><a href="#">Systemic Anti-Cancer Therapy (chemotherapy)</a></li>
                        <li><a href="#">Thirty-day postoperative mortality after colorectal</a></li>
                        <li><a href="#">Understanding Cancer e-Learning</a></li>
                        <li><a class="locked" href="#">Urological Cancer Hub</a></li>
                        <li><a class="locked" href="#">Urological Cancer Profiles</a></li>
                    </ul>
                </li>
                <li><span>Comparison pratice and performance</span></li>
                <li><span>Drugs and Alcohol</span></li>
                <li><span>Health inequalities</span></li>
                <li><span>Health needs</span></li>
                <li><span>Health Profiles</span></li>
                <li><span>Hospital episodes and admissions</span></li>
                <li><span>Infectious and communicable disease</span></li>
                <li><span>Injuries and violence</span></li>
                <li><span>Learning Disabilities</span></li>
                <li><span>Lifestyle, diet and exercise</span></li>
                <li><span>Long term conditions</span></li>
                <li><span>Mental health</span></li>
                <li><span>Other</span></li>
                <li><span>Screening</span></li>
                <li><span>Sexual health</span></li>
                <li><span>Smoking</span></li>
                <li><span>Social care, adults and older people</span></li>
            </ul>
                </li>
            </ul>



        </div>