Tree 树形控件

```vue
<template>
    <lls-tree :data="data" :defaultProps="{ children: 'children', label: 'name' }"/>
</template>

<script>

export default {
  data () {
    return {
        data: [
        {
          name: '区域类',
          id: '1',
          children: [
            { name: '水系', id: '11' },
            { name: '工地', id: '12' }
          ]
        },
        { name: '设备类', id: '2', children: [{ name: '视频监控', id: '21' }] },
        {
          name: '设施类',
          id: '3',
          children: [
            { name: '能源设施', id: '21' },
            { name: '水务设施', id: '22' },
            { name: '交通设施', id: '23' },
            { name: '通信设施', id: '24' },
            {
              name: '防灾减灾',
              id: '25',
              children: [{ name: '微消站', id: '251' }]
            }
          ]
        },
        { name: '人员类', id: '4', children: [{ name: '应急队伍', id: '42' }] }
      ]
    }
  },
  methods: {
      
  },
}
</script>
```