JavaScript实现鼠标经过显示下拉框-偶像资源网

本文实例为大家分享了JavaScript实现鼠标经过显示下拉框的具体代码，供大家参考，具体内容如下
代码：
<!DOCTYPE html>
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<body>
    <ul class=\"nav\" id=nav>
        <li>
            <a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >新浪</a>
            <ul>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >新闻</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >体育</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >快讯</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >生活</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >微博</a> </li>
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        </li>
        <li>
            <a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >新浪</a>
            <ul>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >新闻1</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >体育1</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >快讯1</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >生活1</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >微博1</a> </li>
            </ul>
        </li>

        <li>
            <a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >新浪</a>
            <ul>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >新闻2</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >体育2</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >快讯2</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >生活2</a> </li>
                <li><a href=\"#\" rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\"  rel=\"external nofollow\" >微博2</a> </li>
            </ul>
        </li>


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JavaScript实现鼠标经过显示下拉框

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