<cn>
#### 可搜索
可搜索的树。
</cn>

<us>
#### Searchable
Searchable Tree.
</us>

```html
<template>
  <div>
    <a-input-search style="margin-bottom: 8px" placeholder="Search" @change="onChange" />
    <a-tree
      @expand="onExpand"
      :expandedKeys="expandedKeys"
      :autoExpandParent="autoExpandParent"
      :treeData="gData"
    >
      <template slot="title" slot-scope="{title}">
        <span v-if="title.indexOf(searchValue) > -1">
          {{title.substr(0, title.indexOf(searchValue))}}
          <span style="color: #f50">{{searchValue}}</span>
          {{title.substr(title.indexOf(searchValue) + searchValue.length)}}
        </span>
        <span v-else>{{title}}</span>
      </template>
    </a-tree>
  </div>
</template>

<script>
const x = 3
const y = 2
const z = 1
const gData = []

const generateData = (_level, _preKey, _tns) => {
  const preKey = _preKey || '0'
  const tns = _tns || gData

  const children = []
  for (let i = 0; i < x; i++) {
    const key = `${preKey}-${i}`
    tns.push({ title: key, key, scopedSlots: { title: 'title' }})
    if (i < y) {
      children.push(key)
    }
  }
  if (_level < 0) {
    return tns
  }
  const level = _level - 1
  children.forEach((key, index) => {
    tns[index].children = []
    return generateData(level, key, tns[index].children)
  })
}
generateData(z)

const dataList = []
const generateList = (data) => {
  for (let i = 0; i < data.length; i++) {
    const node = data[i]
    const key = node.key
    dataList.push({ key, title: key })
    if (node.children) {
      generateList(node.children, node.key)
    }
  }
}
generateList(gData)

const getParentKey = (key, tree) => {
  let parentKey
  for (let i = 0; i < tree.length; i++) {
    const node = tree[i]
    if (node.children) {
      if (node.children.some(item => item.key === key)) {
        parentKey = node.key
      } else if (getParentKey(key, node.children)) {
        parentKey = getParentKey(key, node.children)
      }
    }
  }
  return parentKey
}
export default {
  data () {
    return {
      expandedKeys: [],
      searchValue: '',
      autoExpandParent: true,
      gData,
    }
  },
  methods: {
    onExpand  (expandedKeys) {
      this.expandedKeys = expandedKeys
      this.autoExpandParent = false
    },
    onChange (e) {
      const value = e.target.value
      const expandedKeys = dataList.map((item) => {
        if (item.key.indexOf(value) > -1) {
          return getParentKey(item.key, gData)
        }
        return null
      }).filter((item, i, self) => item && self.indexOf(item) === i)
      Object.assign(this, {
        expandedKeys,
        searchValue: value,
        autoExpandParent: true,
      })
    },
  },
}
</script>

```
