Element UI Tree树形结构节点过长时-换行显示

<template>
<div>
<div class="tree">
<el-tree :data="data" :props="defaultProps" @node-click="handleNodeClick" :default-expand-all="true" ></el-tree>
</div>
</div>
</template>

<style lang="scss" scoped>
.tree {
width:220px;
::v-deep .el-tree-node {
white-space: normal;//关键代码!!!!!!!!!
.el-tree-node__content {
height: 100%;
align-items: start;
}
}
}
</style>