view Tree 取消选中状态

view中 引用Tree组件，在不刷新的情况下怎么取消选中的状态

<template>
    <Tree :data="treeList" show-checkbox></Tree>
    <Button @click='emptyOptions(treeList)'>清空选中项</Button>
</template>
<script>
    export default {
        data () {
            return {
                treeList: [
                    {
                        title: 'parent 1',
                        expand: true,
                        children: [
                            {
                                title: 'parent 1-1',
                                expand: true,
                                children: [
                                    {
                                        title: 'leaf 1-1-1'
                                    },
                                    {
                                        title: 'leaf 1-1-2'
                                    }
                                ]
                            },
                            {
                                title: 'parent 1-2',
                                expand: true,
                                children: [
                                    {
                                        title: 'leaf 1-2-1'
                                    },
                                    {
                                        title: 'leaf 1-2-1'
                                    }
                                ]
                            }
                        ]
                    }
                ]
            }
        },
      methods: {
        // 清空checked
        emptyOptions(data) {
          data.map((item) => {
             if (item.checked != undefined || item.indeterminate != undefined) {
                item.checked = false
                item.indeterminate = false
              }
              if (item.children && item.children.length > 0) {
                this.emptyOptions(item.children)
               }
            })
          },
       },
    }
</script>