element tree树组件设置title值

<el-tree
    :data="speNodeData"
    :expand-on-click-node="false"
    :check-on-click-node="true"
    node-key="id"
    ref="tree"
    accordion
    default-expand-all
    :highlight-current="true"
    :props="defaultProps"
    @node-click="clickNode">
    <span slot-scope="{ node, data }">
        <span class="color-333 titles ellipsis" :title="node.label">{{node.label}}</span>
    </span>
</el-tree>