vue递归组件实现树形结构

一：递归组件

什么是递归组件？简单来说就是在组件中内使用组件本身。函数自己调用自己。很多情况下我们呢刷数据的时候，不知道到底这个数据结构是有多少层，那么这个时候我们就用到了递归来实现。

二：先用for来遍历：

父组件中：

<template>
  <div class="home">
  
    <tree :title="list.name" :list="list.children"></tree>
  </div>
</template>

<script>
import tree from '../components/tree'
export default {
  name: "Home",
  components: {
    tree
  },
  data: function() {
    return {
      list: {
        name: "酒店",

        children: [
          {
            name: "经济",
            children: [
              {
                name: "如家",
                children: [
                  {
                    name: "长江路-如家"
                  },
                  {
                    name: "望江路-如家"
                  }
                ]
              },
              {
                name: "7天",
                children: [
                  {
                    name: "长江路-7天"
                  },
                  {
                    name: "望江路-7天"
                  }
                ]
              }
            ]
          },
          {
            name: "舒适",
            children: [
              {
                name: "智选假日",
                children: [
                  {
                    name: "卧龙路-智选假日"
                  },
                  {
                    name: "望江路-智选假日"
                  }
                ]
              },
              {
                name: "全季",
                children: [
                  {
                    name: "卧龙路-全季"
                  },
                  {
                    name: "建设路-全季"
                  }
                ]
              }
            ]
          },
          {
            name: "商务",
            children: [
              {
                name: "中方商务",
                children: [
                  {
                    name: "卧龙路-中方商务"
                  },
                  {
                    name: "望江路-中方商务"
                  }
                ]
              },
              {
                name: "锦江之星",
                children: [
                  {
                    name: "人民路-锦江之星"
                  },
                  {
                    name: "新华路-锦江之星"
                  }
                ]
              }
            ]
          }
        ]
      }
    };
  },
  methods: {}
};
</script>
<style scoped>
.ww {
  margin-left: 20px;
}
.hh {
  font-size: 10px;
}
</style>

子组件中：

<!--  -->
<template>
  <div>

  <!-- 第一层循环 循环酒店-->
     <div v-for="(item,index) in list " :key="index">
      <h3>{{item.name}}</h3>
    <!-- <! 第二层循环酒店的类型--> 
 
    <div v-for="(item,index) in item.children" :key="index">
      <h5>{{item.name}}</h5>
      <!-- 第三层循环酒店的名称 -->
      <div v-for="(item,index) in item.children" :key="index" class="ww">
        <h6>{{item.name}}</h6>
        <!-- 第四层循环酒店的具体介绍  -->
        <div v-for="(item,index) in item.children" :key="index" class="hh">{{item.name}}</div>
      </div>
    </div>
   </div> 


  </div>
</template>

<script>
export default {
  name: "tree",
  components: {},
  data: function() {
    return {
      
    };
  },
  props:{
    title:
    {
      type: String,
      default:"标题"

    },
    list:{
      type:Array,

    }
  }
  
};
</script>
<style scoped>
/* @import url(); 引入css类 */
</style>

效果图如下：
　　

三：递归来实现？

通过组件自身的 name名字来实现组件自身的递归调用 .

父组件中：

<template>
  <div class="home">
  
   <tree :title="list.name" :list="list.children" :detph="0"></tree>
  </div>
</template>

<script>
import tree from '../components/tree'
export default {
  name: "Home",
  components: {
    tree
  },
  data: function() {
    return {
      list: {
        name: "酒店",

        children: [
          {
            name: "经济",
            children: [
              {
                name: "如家",
                children: [
                  {
                    name: "长江路-如家"
                  },
                  {
                    name: "望江路-如家"
                  }
                ]
              },
              {
                name: "7天",
                children: [
                  {
                    name: "长江路-7天"
                  },
                  {
                    name: "望江路-7天"
                  }
                ]
              }
            ]
          },
          {
            name: "舒适",
            children: [
              {
                name: "智选假日",
                children: [
                  {
                    name: "卧龙路-智选假日"
                  },
                  {
                    name: "望江路-智选假日"
                  }
                ]
              },
              {
                name: "全季",
                children: [
                  {
                    name: "卧龙路-全季"
                  },
                  {
                    name: "建设路-全季"
                  }
                ]
              }
            ]
          },
          {
            name: "商务",
            children: [
              {
                name: "中方商务",
                children: [
                  {
                    name: "卧龙路-中方商务"
                  },
                  {
                    name: "望江路-中方商务"
                  }
                ]
              },
              {
                name: "锦江之星",
                children: [
                  {
                    name: "人民路-锦江之星"
                  },
                  {
                    name: "新华路-锦江之星"
                  }
                ]
              }
            ]
          }
        ]
      }
    };
  },
  methods: {}
};
</script>
<style scoped>
.ww {
  margin-left: 20px;
}
.hh {
  font-size: 10px;
}
</style>

子组件：

<!--  -->
<template>
  <div>
    <div :style="getDetph">
      <!-- 显示隐藏 -->
      <div @click="getData ">
        <!-- 这里呢如果为真的话就显示那么就是减号否则的话就是加号 -->
        <span >{{isShow?'-':'+'}}</span>{{title}}</div>
      <!-- 那么在这里我们就需要改成 item.name和item.children -->
      <div v-if="isShow">
        <tree
          :title="item.name"
          :list="item.children"
          v-for="(item,index) in list"
          :key="index"
          :detph="detph+1"
        >
          <!-- 每次递增1 -->
        </tree>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: "tree",
  components: {},
  data: function() {
    return {
      isShow: false
    };
  },
  props: {
    // 接收标题
    title: {
      type: String
      // default: "标题"
    },
    // 接收一整个数组
    list: {
      type: Array
    },
    // 用来接收层数
    detph: {
      type: Number
    }
  },
  // 计算属性用来接收我们的层数
  computed: {
    getDetph() {
      return `transform:translate(${this.detph * 20}px)`;
    }
  },
  methods: {
    getData: function() {
      this.isShow = !this.isShow;
    }
  }
};
</script>
<style scoped>
/* @import url(); 引入css类 */
</style>

效果图：