本文实例为大家分享了JS实现百度新闻导航栏效果的具体代码，供大家参考，具体内容如下
最近在学Web前端，用js简单实现了百度新闻导航栏的效果。当鼠标移动到某一选项上方时，会有一个红色背景块滑动到当前选项上。当点击某一选项后，固定的红色背景块位置会移动到当前选项，意为当前选项被选中。话不多说，代码如下
body部分
<div class="box">
<!--两个红色背景块-->
<!--随鼠标移动的背景块-->
<div id="move"></div>
<!--鼠标点击后固定在某处的背景块-->
<div id="fixed"></div>
<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" >主页</a>
<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" >国内</a>
<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" >国际</a>
<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" >军事</a>
<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" >财经</a>
<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" >娱乐</a>
<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" >体育</a>
<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" >互联网</a>
<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" >科技</a>
<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" >游戏</a>
<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" >女人</a>
<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" >汽车</a>
<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" >房产</a>
</div>
css部分
*{
margin: 0;
padding: 0;
}
.box{
top:100px;
width: 790px;
height: 30px;
font-size: 0;
position: relative;
margin: 0 auto;
background-color: #01204f;
}
a{
display: inline-block;
position: relative;
width: 60px;
height: 30px;
line-height: 30px;
color: white;
font-size: 16px;
text-decoration: none;
text-align: center;
transition: all 0.6s;
}
#move{
position: absolute;
background-color: red;
top: 0px;
left: 0px;
width: 60px;
height: 30px;
transition: all 0.6s;
}
#fixed{
position: absolute;
background-color: red;
top: 0px;
left: 0px;
width: 60px;
height: 30px;
}
js部分
window.onload = function () {
let move = document.getElementById("move");//滑动的背景块
let fixed = document.getElementById("fixed");//固定在某处的背景块
let aList = document.getElementsByTagName("a");//a标签列表
let left = move.offsetLeft + "px";//滑动背景块的初始位置
//使所有a标签绑定移入、移出、单击事件
for (let i = 0; i < aList.length; i++) {
aList[i].onmouseover = function () {
// 鼠标移入某个a标签时，滑动背景块滑到当前a标签的位置
move.style.left = aList[i].offsetLeft + "px";
}
aList[i].onmouseout = function () {
// 鼠标移出a标签时，滑动背景块返回初始位置
move.style.left = left;
}
aList[i].onclick = function () {
// 某个a标签被点击后，固定背景块移动到当前a标签的位置
fixed.style.left = aList[i].offsetLeft + "px";
// 将滑动背景块的初始位置更新为当前a标签的位置
left = aList[i].offsetLeft + "px";
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持NICE源码。
