导航栏nav案例(addEventListener事件监听)
定义和⽤法
addEventListener ⽤于向指定元素添加事件句柄(⼜称事件处理函数)
语法
element.addEventListener(event, function, useCapture)
element ⽂档节点,duocument,window。
event 必须有。是⼀个字符串,指定事件名(⼀般不使⽤“on前缀”,例如“click,mouseover”)。
function 必须有。指定要事件触发时执⾏的函数(可以是函数,也可以是函数名)。
useCapture 可选。布尔值(true 或者false)指定事件是否在捕获阶段还是在冒泡阶段执⾏,⼀般情况下默认值为false
1、如果为true则事件句柄在捕获阶段执⾏
2、如果为false则事件句柄在冒泡阶段执⾏
html:
<div class='row head_body_below'>
<div class="col-md-1 col-sm-1 style_col_md">
<a id='style_title_a' href=''>⾸页</a>
</div>
<div class="col-md-1 col-sm-1 style_col_md">
<div class='title_style'>
<a id='style_title_a' href=''> 院区概览</a>
</div>
<ul class='style_ul'>
<li><a id='style_a' href=''>医院简介</a></li>
<li><a id='style_a' href=''>院领导介绍</a></li>
<li><a id='style_a' href=''>组织架构</a></li>
</ul>
</div>
<div class="col-md-1 col-sm-1 style_col_md">
<div class='title_style'>
<a id='style_title_a' href=''> 科室导览</a>
</div>
<ul class='style_ul'>
<li><a id='style_a' href=''>科室介绍</a></li>
<li><a id='style_a' href=''>门诊时间</a></li>
</ul>
</div>
<div class="col-md-1 col-sm-1 style_col_md">
<div class='title_style'>
<a id='style_title_a' href=''> 医院新闻</a>
</div>
<ul class='style_ul'>
<li><a id='style_a' href=''>医院动态</a></li>
</ul>
</div>
<div class="col-md-1 col-sm-1 style_col_md">
<div class='title_style'>
<a id='style_title_a' href='#'> 医师风采</a>
</div>
<ul class='style_ul'>
<li><a id='style_a' href='expertteam.jsp?type=0'>医师风采</a></li>
<li><a id='style_a' href='expertteam.jsp?type=1'>专家介绍</a></li>
<li><a id='style_a' href='expertteam.jsp?type=2'>名医介绍</a></li>
</ul>
</div>
<div class="col-md-1 col-sm-1 style_col_md">
<div class='title_style border_style'>
<a id='style_title_a' href='#'> 服务指南</a> </div>
<ul class='style_ul'>
<li><a id='style_a' href='#'>门诊指南</a></li> <li><a id='style_a' href='#'>住院指南</a></li> <li><a id='style_a' href='#'>交通指南</a></li> <li><a id='style_a' href='#'>体检指南</a></li> </ul>
</div>
</div>
css:
html{
width: 100%;
height: 100%;
}
body{
width: 100%;
height: 100%;
}
.style_col_md{
font-size: 20px;
color: #966334;
text-align: center;
padding: 0px;
position: relative;
width: 17%;
height: 100px;
line-height: 100px;
}
.head_body_below{
text-align: center;
position: relative;
display: flex;
flex-direction: row;
justify-content: center;
align-items: center;
width: 1200px;
margin: 0 auto;
height: 100px;
background-color: #FFF8EB;
}
.title_style{
height: 35px;
padding: 0px;
}
.
style_ul{
list-style-type:none;
padding: 0px;
background-color: #FFF8EB;
display: none;
position: absolute;
top:20px;
width:90%;
left:4px;
z-index:99;
margin-top: 80px;
opacity: 0.8;
}
.style_ul li{
line-height: 55px;
width: 100%;
}
#style_title_a{
color:#956034;
font-weight: bold;
text-decoration: none;
}
#style_title_a:hover{
color:#00A09D;
}
#style_hr{
color:#C4A384;
}
.home_body_top{
width: 100%;
}
#item_style_img{
width:100%;
height:100%;
}
background-color: #FFF8EE;
height: 200px;
border-bottom: 2px solid #CCC6BD; }
.home_style_img{
width: 100%;
height: 90%;
text-align: center;
}
.home_style_img_title{
width: 100%;
height: 10%;
text-align: center;
margin-top: 10px;
}
#img_style_a{
text-decoration: none;
font-size: 18px;
}
js导航栏下拉菜单#img_style_a:hover{
color:#00A09D;
}
.foot_info_top a{
color:white;
text-decoration: none;
font-size: 12px;
}
.foot_info_center{
text-align:center;
letter-spacing:2px;
margin-top:10px;
color:white;
}
.style_border{
background-color: #F4E8D8;
height: 600px;
}
.style_span{
font-weight: bold;
font-size: 18px;
color:#936235;
margin-top: 20px;
margin-left:20px;
float: left;
}
.style_All_a{
margin-top: 20px;
font-size: 16px;
text-align:right;
}
.style_All_a_style:hover{
color: #936235;
text-decoration: none;
}
.
gn_style_img{
width: 80%
}
.news{
width:250px;
height:230px;
}
.san{
position: relative;
}
.gn_style_img{
width: 50%;
}
#style_a{
color: black;
text-decoration: none;
font-size: 16px;
}
#style_a:hover{
color: #00A09D;
}
js:(需要先引⼊jq)
<script>
titleclick();
})
//导航栏移⼊移除
function titleclick(){
var sc = ElementsByClassName('style_col_md');
for (var i = 0; i < sc.length; i++) {
sc[i].addEventListener("mouseenter",function(){
$(this).children("ul").css("display","block");
})
sc[i].addEventListener("mouseleave",function(){
$(this).children("ul").css("display","none");
});
}
}
</script>
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