小程序顶部导航栏，可滑动，可动态选中放大

<!-- 导航栏 -->
<scroll-view scroll-x class="navbar" scroll-with-animation scroll-left="{{scrollLeft}}rpx">
  <view class="nav-item" wx:for="{{tabs}}" wx:key="id" bindtap="tabSelect" data-id="{{index}}">
    <view class="nav-text {{index==tabCur?'tab-on':''}}">{{item.name}}</view>
  </view>
</scroll-view>

/* 导航栏布局相关 */
.navbar {
  width: 100%;
   height: 90rpx;
  /* 文本不换行 */
  white-space: nowrap;
  display: flex;
  box-sizing: border-box;
  border-bottom: 1rpx solid #eee;
  background: #fff;
  align-items: center;
  /* 固定在顶部 */
  position: fixed;
  left: 0rpx;
  top: 0rpx;
}
.nav-item {
  padding-left: 25rpx;
  padding-right: 25rpx;
  height: 100%;
  display: inline-block;
  /* 普通文字大小 */
  font-size: 28rpx;
}
.nav-text {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 4rpx;
  box-sizing: border-box;
}
.tab-on {
  color: #fbbd08;
  /* 选中放大 */
  font-size: 38rpx !important;
  font-weight: 600;
  border-bottom: 4rpx solid #fbbd08 !important;
}

// pages/test2/test2.js
Page({
  data: {
    tabCur: 0, //默认选中
    tabs: [{
        name: '等待支付',
        id: 0
      },
      {
        name: '待发货',
        id: 1
      },
      {
        name: '待收货',
        id: 2
      },
      {
        name: '待签字',
        id: 3
      },
      {
        name: '待评价',
        id: 4
      },
      {
        name: '五星好评',
        id: 5
      },
      {
        name: '差评订单',
        id: 6
      },
      {
        name: '编程小石头',
        id: 8
      },
      {
        name: '小石头',
        id: 9
      }
    ]
  },
  //选择条目
  tabSelect(e) {
    this.setData({
      tabCur: e.currentTarget.dataset.id,
      scrollLeft: (e.currentTarget.dataset.id - 2) * 200
    })
  }
})