kui-vue/components/tree/demo/sync.md

A high quality UI Toolkit built on Vue.js 2.0

<cn>
#### 异步加载
点击展开节点，动态加载数据。
</cn>

```vue
<template>
  <Tree :data="data" @load-data="loadData" @expand="expand"/>
</template>
<script>
export default {
  data() {
    return {
      data: [
        { title: 'Expand to load' },
        { title: 'Expand to load' },
        { title: 'Tree Node', isLeaf: true },
      ],
    }
  },
  methods: {
    expand(data){
      console.log(data)
    },
    loadData(node, callback) {
      //模拟异步请求
      setTimeout(() => {
        let data = [
          { title: 'Child Node' },
          { title: 'Child Node' }
        ];
        callback(data);
      }, 1000)
    }
  }
}
</script>
```