微信小程序实现点击导航条切换页面

<!-- 导航条 -->
<view class="nav">
 <view bindtap="navSwitch" data-index="0" class="{{navState==0 ">页面一</view>
 <view bindtap="navSwitch" data-index="1" class="{{navState==1 ">页面二</view>
 <view bindtap="navSwitch" data-index="2" class="{{navState==2 ">页面三</view>
</view>
<!-- 不可滑动页 -->
<view>
 <view wx:if="{{navState==0}}" class="style-default">1</view>
 <view wx:elif="{{navState==1}}" class="style-default">2</view>
 <view wx:else="{{navState==2}}" class="style-default">3</view>
</view>
<!-- 滑动页 -->
<swiper bindchange="bindchange" current="{{navState}}">
 <block>
 <swiper-item>
 <view class="style-roll">
 <text>左右可滑动1</text>
 </view>
 </swiper-item>
 <swiper-item>
 <view class="style-roll">
 <text>左右可滑动2</text>
 </view>
 </swiper-item>
 <swiper-item>
 <view class="style-roll">
 <text>左右可滑动3</text>
 </view>
 </swiper-item>
 </block>
</swiper>

Page({
 data: {
 navState: 0,//导航状态
 },
 //监听滑块
 bindchange(e) {
 // console.log(e.detail.current)
 let index = e.detail.current;
 this.setData({
 navState:index
 })
 },
 //点击导航
 navSwitch: function(e) {
 // console.log(e.currentTarget.dataset.index)
 let index = e.currentTarget.dataset.index;
 this.setData({
 navState:index
 })
 },

 /**
 * 生命周期函数--监听页面加载
 */
 onLoad: function(options) {

 },
})

.nav{
 display: flex;
 justify-content: space-around;
 padding: 20rpx;
 background-color: rgb(129, 241, 55);
 font-size: 30rpx;
}
.nav-switch-style{
 color: snow;
}
.style-default{
 background-color: rgb(247, 229, 130);
 padding: 100rpx 0;
 text-align: center;
}
.style-roll{
 background-color: rgb(130, 177, 247);
 padding: 100rpx 0;
 text-align: center;
}