vue 组件动态切换和非动态切换的演示

首页组件：

<template>
  <div>
    <div class="tab-wrap">
      <div :class="{tab:true,active:item.active}" v-for="(item,index) in tabs"
           :key="index" @click="tabsSelect(index,item.componentName)">{{item.title}}</div>
    <!--<div class="tab">会员登录</div>-->
    <!--<div class="tab">菜品分类</div>-->
    </div>

    <!--非动态方式-->
    <!--<details-component v-if="this.currentComponent==='details-component'"></details-component>-->
    <!--<log-in-component v-if="this.currentComponent==='log-in-component'"></log-in-component>-->
    <!--<sort-component v-if="this.currentComponent==='sort-component'"></sort-component>-->

    <!--动态方式 component为固定写法-->
    <!--因为vue在切换的时候数据都会重新渲染，所以再切回去的时候就会清空-->
    <!--避免重新渲染，可以用缓存keep-alive-->
    <keep-alive>
      <component :is="currentComponent"></component>
    </keep-alive>
  </div>
</template>

<script>
import DetailsComponent from "@/pages/test/components/DetailsComponent";
import LogInComponent from "@/pages/test/components/LogInComponent";
import SortComponent from "@/pages/test/components/SortComponent";
export default {
  name: "good",
  components: {
    DetailsComponent, //菜单详情
    LogInComponent, //会员登录
    SortComponent //商品分类
  },
  data() {
    return {
      tabs:[
        {title:'菜单详情',active:true,componentName:'details-component'},
        {title:'会员登录',active:false,componentName:'log-in-component'},
        {title:'菜品分类',active:false,componentName:'sort-component'},
      ],
      currentComponent:'details-component' //默认
    }
  },
  methods: {
    tabsSelect(index,componentName){
      for (let i = 0; i < this.tabs.length; i++) {
        if (this.tabs[i].active){
          this.tabs[i].active = false;
          break;
        }
      }
      this.tabs[index].active = true;
      //解决数据发生变化视图不渲染问题
      this.$set(this.tabs,index,this.tabs[index]);
      //让获取的组件赋值给this.currentComponent 然后再去判断
      this.currentComponent = componentName;
      console.log(this.currentComponent)
    }
  },
}
</script>

<style scoped>
.tab-wrap {
   100%;
}

.tab-wrap .tab {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid white;
  margin-right: 5px;
}

.tab-wrap .tab.active {
  background-color: #007aff;
}
</style>

子组件：SortComponent.vue

<template>
  <div>
    <div class="main">
      <div :class="{'classify-tab':true,active:item.active}" v-for="(item,index) in classify" :key="item.id" @click="classifySelect(index)">
        {{ item.title }}
      </div>
      <!--      <div class="classify-tab">馒头片</div>-->
      <!--      <div class="classify-tab">啤酒</div>-->
    </div>
  </div>
</template>

<script>
export default {
  name: "SortComponent",
  data() {
    return {  //点击切换颜色 经典写法
      classify: [
        {id: 1, title: '羊肉串', active: false},
        {id: 2, title: '馒头片', active: true},
        {id: 3, title: '啤酒', active: false},
      ]
    }
  },
  methods:{
    classifySelect(index){
      for (let i = 0; i <this.classify.length; i++) { //关闭
        if(this.classify[i].active){ //当循环到点击的位置时，不需要再循环下面的，然后跳出就行，可以节省资源
          this.classify[i].active=false
          break;
        }
      }
      this.classify[index].active = true;
      //this,$set解决数据更新视图不渲染问题
      this.$set(this.classify,index,this.classify[index]);
    }
  }
}
</script>

<style scoped>
.main {
  border: 1px solid #EFEFEF;
  padding: 5px 10px;
}

.main .classify-tab {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid white;
  margin-right: 5px;
}

.main .classify-tab.active {
  background-color: #b7cae3;
}
</style>

子组件：LogInComponent.vue

<template>
  <div>
    <div class="main">
      <input type="text">
      <button type="button">会员登录</button>
    </div>
  </div>
</template>

<script>
export default {
  name: "LogInComponent"
}
</script>

<style scoped>
.main{
  border: 1px solid #EFEFEF;
  padding: 5px 10px;
}
</style>

子组件：DetailsComponent.vue

<template>
  <div>
    <div class="main">菜单详情</div>
  </div>
</template>

<script>
export default {
  name: "DetailsComponent"
}
</script>

<style scoped>
.main{
  border: 1px solid #EFEFEF;
  padding: 5px 10px;
}
</style>