为什么菜单背景颜色没有变化？
[英]Why doesn't the menu background color change?
问题描述
我创建了2 menus:prod & prod2 ，我发现当mouse focus on prod2 ，背景色已更改，但是当mouse focus on prod2上时prod1 the background color doesn't change 。
为什么它没有改变？
样式：
ul.hMenu {
margin: 0;
padding: 0;
z-index: 1;
}
ul.hMenu > li {
margin: 0;
padding: 0;
list-style: none;
float: left;
width:140px;
}
ul.hMenu li a {
display: block;
text-align: left;
text-decoration: none
}
ul.hMenu li > div {
position: absolute;
display: none;
}
ul.hMenu div a {background: yellow;
}
div.lay1{ float:left;}
div.lay1 br{line-height:50%}
.topMenu{font:bold 12px arial;color:#169e39;text-decoration: none;}
.secondMenu{font:12px arial;color:#000000;text-decoration: none;}
.arrow_box {
position: relative;
background: red;
border: 4px solid #c2e1f5;
}
.arrow_box:after, .arrow_box:before {
bottom: 100%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
}
.arrow_box:after {
border-color: rgba(149, 213, 53, 0);
border-bottom-color: red;
border-width: 13px;
left: 10%;
margin-left: -13px;
}
.arrow_box:before {
border-color: rgba(194, 225, 245, 0);
border-bottom-color: #c2e1f5;
border-width: 19px;
left: 10%;
margin-left: -19px;
}
脚本：
function showMenu(obj){
var a=obj.children[0];
a.style.color="blue";
var div = obj.children[1];
obj.style.backgroundColor="yellow";
div.style.display="block";
}
function hideMenu(obj){
var a=obj.children[0];
a.style.color="red";
var div = obj.children[1];
div.style.display="none";
obj.style.backgroundColor="";
}
HTML：
<ul class="hMenu">
<li onmouseover="showMenu(this);" onmouseout="hideMenu(this);">
<a style="color: red;" href="javascript:void(0);">prod</a>
<div><br/>
<!-- here-->
<div class="arrow_box" >
<div class="lay1">
<div><a href="" class="topMenu">Manage Content</a><br><a href="" class="secondMenu"> Message </a></div>
<br><br>
<div><a href="" class="topMenu">Manage Assignment</a><br><a href="" class="secondMenu"> User Inquiry</a></div>
</div>
</div>
</div>
</li>
<li onmouseover="showMenu(this);" onmouseout="hideMenu(this);">
<a style="color: red;" href="javascript:void(0);">prod2</a>
<div class="arrow_box">
<div class="lay1">
<div><a href="" class="topMenu">Manage Content</a><br><a href="" class="secondMenu"> Message </a><br><a href="" class="secondMenu"> Help </a></div>
<br><br>
<div><a href="" class="topMenu">Manage Assignment</a><br><a href="" class="secondMenu"> User Inquiry</a></div>
</div>
</div>
</li>
</ul>
<br/><br/><br/><br/><br/>
Test
4 个解决方案
解决方案1
1 2013-10-10 05:29:53
我测试了您的代码，它起作用了！ 您的浏览器是什么？ 请放置一个演示，并同时添加此代码
a.setAttribute('style','background-color:blue');
一些浏览器与element.style不兼容
解决方案2
0 2013-10-10 06:27:11
解决方案3
0 2013-10-10 06:30:08
请尝试以下HTML：
<body>
<ul class="hMenu">
<li onmouseover="showMenu(this);" onmouseout="hideMenu(this);">
<a style="color: red;" href="javascript:void(0);">prod</a>
<div class="arrow_box" >
<div class="lay1">
<div><a href="" class="topMenu">Manage Content</a><br><a href="" class="secondMenu"> Message </a></div>
<br><br>
<div><a href="" class="topMenu">Manage Assignment</a><br><a href="" class="secondMenu"> User Inquiry</a></div>
</div>
</div>
</li>
<li onmouseover="showMenu(this);" onmouseout="hideMenu(this);">
<a style="color: red;" href="javascript:void(0);">prod2</a>
<div class="arrow_box">
<div class="lay1">
<div><a href="" class="topMenu">Manage Content</a><br><a href="" class="secondMenu"> Message </a><br><a href="" class="secondMenu"> Help </a></div>
<br><br>
<div><a href="" class="topMenu">Manage Assignment</a><br><a href="" class="secondMenu"> User Inquiry</a></div>
</div>
</div>
</li>
</ul>
<br/><br/><br/><br/><br/>
Test
</body>
解决方案4
-1 2013-10-10 05:58:14
请检查您的HTML：
因为您对Pord or Pord2执行相同的功能，但是li的Inner html不同。 所以function showMenu()对Pord or Pord2作用不同：
HTML：
<ul class="hMenu">
<li onmouseover="showMenu(this);" onmouseout="hideMenu(this);"><a style="color: red;"
href="javascript:void(0);">prod</a>
<div class="arrow_box">
<br />
<div class="lay1">
<div>
<a href="" class="topMenu">Manage Content</a><br>
<a href="" class="secondMenu"> Message </a>
</div>
<br />
<br />
<div>
<a href="" class="topMenu">Manage Assignment</a><br>
<a href="" class="secondMenu"> User Inquiry</a></div>
</div>
</div>
</li>
<li onmouseover="showMenu(this);" onmouseout="hideMenu(this);"><a style="color: red;"
href="javascript:void(0);">prod2</a>
<div class="arrow_box">
<br />
<div class="lay1">
<div>
<a href="" class="topMenu">Manage Content</a><br>
<a href="" class="secondMenu"> Message </a>
<br>
<a href="" class="secondMenu"> Help </a>
</div>
<br />
<br />
<div>
<a href="" class="topMenu">Manage Assignment</a><br>
<a href="" class="secondMenu"> User Inquiry</a></div>
</div>
</div>
</li>
</ul>
更新
将<br />放在arrow_box div前面，以表示li并更改Javascript：
var div = obj.children[2];
Javascript-
function showMenu(obj){
var a=obj.children[0];
a.style.color="blue";
var div = obj.children[2];
obj.style.backgroundColor="yellow";
div.style.display="block";
}
function hideMenu(obj){
var a=obj.children[0];
a.style.color="red";
var div = obj.children[2];
div.style.display="none";
obj.style.backgroundColor="";
}
为什么背景颜色不先改变？
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