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代码出现点buy

代码出现点buy

keida 2015-05-02 17:21:38
 当我鼠标划过学习中心 会出现二级菜单 可是当我划过学习中心, 而二级菜单还没有显示完全, 很快把它在移动到别的链接上然后再移回学习中心。而导致二级菜单显示没有完成使得其菜单卡在那里。。请问这个bug 怎么解决啊<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head>    <title></title>    <style type="text/css">        .top-nav        {            font-size: 14px;            font-weight: bold;            list-style: none;        }        .top-nav li        {            float: left;            margin-right: 1px;        }        .top-nav li a        {            line-height: 34px;            text-decoration: none;            background: #3f240e;            color: #fff;            display: block;            width: 80px;            text-align: center;        }                .top-nav ul        {            list-style: none;            display: none;            padding: 0;            position: absolute;            height: 0;            overflow: hidden;        }                .top-nav li a:hover        {            background: url(http://img1.sycdn.imooc.com//5461b50d0001e28000010034.jpg) 0 0 repeat-x;        }        .note        {            color: #3f240e;            display: block;            background: url(http://img1.sycdn.imooc.com//5461b50d0001e28000010034.jpg) 0 0 repeat-x;        }        .corner        {            display: block;            height: 11px;            background: url(http://img1.sycdn.imooc.com//5461b5620001410d00170011.jpg) 31px 0 no-repeat;        }    </style>    <script type="text/javascript">        window.onload = function () {               //鼠标经过时的效果            var Lis=document.getElementsByTagName("li") ;                for(var i=0;i<Lis.length;++i){                    Lis[i].onmouseover = function () {                    var u = this.getElementsByTagName("ul")[0];                    if (u != undefined) {                        u.style.display="block";                        ChangeH(u.id,1);                    }                }                                                                Lis[i].onmouseleave = function () {                    var u = this.getElementsByTagName("ul")[0];                    if (u != undefined) {                        ChangeH(u.id,-1);                    }                }            }        }        function ChangeH(id, count) {    //    根据ID找到ulList,同时得到其高度            var ulList = document.getElementById(id);            var h = ulList.offsetHeight;               h += count;            if (count > 0) {                if (h <= 42) {   // 将高度赋值给ulList,同时,不断调用本函数                    ulList.style.height = h + "px";                    setTimeout("ChangeH('" + id + "',1)", 10);                }                else {                    return;                }            }            else {                if (h > 0) {  // 将高度赋值给ulList,同时,不断调用本函数                    ulList.style.height = h + "px";                    setTimeout("ChangeH('" + id + "',-1)", 10);                }                else {                    ulList.style.display = "none";                    return;                }            }        }    </script></head><body>    <ul class="top-nav">        <li><a href="#"><span class="note">慕课网</span></a> </li>        <li><a href="#">课程大厅</a> </li>        <li><a href="#">学习中心</a>            <ul id="mnuUL">                <span class="corner"></span>                <li><a href="#">前端课程 </a></li>                <li><a href="#">手机开发</a> </li>                <li><a href="#">后台编程</a></li>            </ul>        </li>        <li><a href="#">关于我们</a></li>    </ul></body></html>
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落寞回头不如华丽转身

TA贡献11条经验 获得超4个赞

产生这个主要原因是因为定时器, 当你移入时, 开启了定时器, 当你移除是, 有开启了一个定时器,  一个增加高度, 一个减少高度, 两者同时运行 ,所以看起来 就是这样的情况 

建议  增加一个 timer 变量  ,  移入移除的时候 先清空定时器 ,在从新开启一个定时器 ,既可以解决这个问题, 如不懂 请继续提问

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反对 回复 2017-01-22
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