<!-- 使用方法 样例 -->
<SelectTree
  ref="SelectTree"
  :filterable="true"
  :value-key="`deptId`"
  :select-key="`deptId`"
  :value-name="`deptName`"
  :tree-data="item.optionArr"
  :tree-props="{
    id: 'deptId',
    label: 'deptName',
    children: 'children'
  }"
  :tree-node-key="`deptId`"
  :placeholder-title="`请选择${item.label}`"
  @nodeClickTree="nodeClickTree"
/>