tab组件为例

1.在项目下建一个components（组件）的文件夹

 

 2.新建组件文件夹 生成同名page

 

3.代码片段

tab.json
{
  "component": true,
  "usingComponents": {}
}

tab.js
//跳转到首页
  gohome(){
    wx.switchTab({
      url: '../../pages/home/home'
    })
  },

  //跳转到订单页
  goorder(){
    wx.switchTab({
      url: '../../pages/mine/mine'
    })
  }

tab.wxml
<view class="tabbar">
    <view class="home icon" bindtap="gohome">
      <image src="http://47.103.128.16:9004/busiroom/theme/default/images/minApp/img/home2.png" class="image"></image>
      <view class="text">首页</view>
    </view>
    <view class="order icon" bindtap="goorder">
      <image src="http://47.103.128.16:9004/busiroom/theme/default/images/minApp/img/mine2.png" class="image"></image>
      <view class="text">我的</view>
    </view>
</view>

tab.wxss
.tabbar{
  width: 100%;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  height: 95rpx;
  position: fixed;
  bottom: 0;
  background-color: #fff;
  padding: 10rpx 0 0 0;
  box-sizing: border-box;
}
.tabbar .icon{
  width: 50%;
  height: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.tabbar .icon .image{
  width: 55rpx;
  height: 55rpx;
}
.tabbar .text{
  color: #7F8389;
  font-size: 20rpx;
  line-height: 35rpx;
}

4.在其他页面使用公共组件

wxml
直接使用创建的page页的命名为标签
<tab></tab>

json
//引入公共组件的路径 不需要后缀名
{
  "usingComponents": {
    "tab":"../../components/tab/tab"
  }
}

 5.展示