本文主要和大家分享js中导航栏背景改变实例，希望能帮助到大家。
使用到this关键字
<!DOCTYPE html><html>
<head>
<meta charset="UTF-8">
<title>导航栏改变背景</title>
<style>
*{margin: 0;padding: 0;}
#p1{width: 600px;height: 50px;position: relative;margin: 100px auto;background: black;}
#p1 ul{position: absolute;top:0;left: 0;}
#p1 ul li{list-style-type: none;width: 100px;height: 50px;text-align: center;
line-height:50px;float: left;cursor: pointer;font-size: 18px;color:white;}
.active{background-color: #0000;}
</style>
<script>
window.onload=function(){
function change1(){
var op= document.getElementById('p1');
var oLi = op.getElementsByTagName('li');
for(var i=0;i<oLi.length;i++){
oLi[i].onmouseover=function(){
this.className='active';
}
oLi[i].onmouseout=function(){
this.className='';
}
}
}
change1();
} </script>
</head>
<body>
<p id='p1'>
<ul>
<li>天猫超市</li>
<li>天猫国际</li>
<li>喵鲜生</li>
<li>电器城</li>
<li>医药馆</li>
<li>苏宁易购</li>
</ul>
</p>
</body></html>