vue实现菜单切换，点击菜单导航切换不同的内容以及为当前点击的选项添加样式，或者组件。

method里：

css:

html代码：

<nav>
<ul>
<li>
<a :class="{active : Index == 1}" @click="changeNav(1)">学校新闻</a>
<div v-if="Index == 1" class="line"></div>
</li>
<li>
<a :class="{active : Index == 2}" @click="changeNav(2)">就业新闻</a>
<div v-if="Index == 2" class="line"></div>
</li>
<li>
<a :class="{active : Index == 3}" @click="changeNav(3)">行业新闻</a>
<div v-if="Index == 3" class="line"></div>
</li>
</ul>
</nav>

js代码：

data () {
return {
Index:1,
}
},

methods: {

//导航切换
changeNav(index){
if(index == 1){

this.Index = 1;
}else if(index == 2){
this.Index = 2;
}else if(index == 3){
this.Index = 3
}
},

css代码：

.news-container nav li .line{
width: 50px;
height: 4px;
background: #E96463;
border: none;
position: relative;
top: -4px;
right: -86px;

}
.news-container nav li .active{
color: rgba(233,100,99,1);
}

}