（八）硅谷外卖前端部分-FooterGuide 组件

一、说明

　　

1. 通过编程式导航实现路由的切换显示($router)
2. 通过动态 class 和$route.path 来实现 tab 样式切换
3. 通过阿里图标库, 显示导航图标

二、编码

2.1 静态页面

<footer class="footer_guide border-1px">
    <a href="javascript:;" class="guide_item on">
      <span class="item_icon">
        <i class="iconfont icon-waimai"></i>
      </span>
      <span>外卖</span>
    </a>
    <a href="javascript:;" class="guide_item">
      <span class="item_icon">
        <i class="iconfont icon-search"></i>
      </span>
      <span>搜索</span>
    </a>
    <a href="javascript:;" class="guide_item">
      <span class="item_icon">
        <i class="iconfont icon-dingdan"></i>
      </span>
      <span>订单</span>
    </a>
    <a href="javascript:;" class="guide_item">
      <span class="item_icon">
        <i class="iconfont icon-geren"></i>
      </span>
      <span>我的</span>
    </a>
  </footer>

2.2 style

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixins.styl"
  .footer_guide  //footer
    top-border-1px(#e4e4e4)
    position fixed
    z-index 100
    left 0
    right 0
    bottom 0
    background-color #fff
    width 100%
    height 50px
    display flex
    .guide_item
      display flex
      flex 1
      text-align center
      flex-direction column
      align-items center
      margin 5px
      color #999999
      &.on
        color #02a774
      span
        font-size 12px
        margin-top 2px
        margin-bottom 2px
        .iconfont
          font-size 22px
</style>

2.3 template

<template>
  <footer class="footer_guide border-1px">
    <div href="javascript:;" @click="goto('/msite')" class="guide_item" :class="{on: $route.path === '/msite'}">
      <span class="item_icon">
        <i class="iconfont icon-waimai"></i>
      </span>
      <span>外卖</span>
    </div>
    <div href="javascript:;" @click="goto('/search')" class="guide_item" :class="{on: $route.path === '/search'}">
      <span class="item_icon">
        <i class="iconfont icon-search"></i>
      </span>
      <span>搜索</span>
    </div>
    <div href="javascript:;" @click="goto('/order')" class="guide_item" :class="{on: $route.path === '/order'}">
      <span class="item_icon">
        <i class="iconfont icon-dingdan"></i>
      </span>
      <span>订单</span>
    </div>
    <div href="javascript:;" @click="goto('/profile')" class="guide_item" :class="{on: $route.path === '/profile'}">
      <span class="item_icon">
        <i class="iconfont icon-geren"></i>
      </span>
      <span>我的</span>
    </div>
  </footer>
</template>

2.4 script

<script>
  export default {
    name: 'FooterGuide',
    methods: {
        goto (url) {
            this.$router.replace(url)
      }
    }
  }
</script>