rc-tree 在反应时不显示导航箭头(+,-)

rc-tree not showing navigation arrows(+,-) on react

我尝试在 React 中实现简单的 rc-tree 组件,但它没有显示我可以展开的“+”按钮,它只显示根父名称。

这是我创建的沙箱 link https://codesandbox.io/s/flamboyant-stonebraker-ythlr?file=/src/App.js

示例代码

<Tree
    defaultExpandAll={false}
    style={{ border: "1px solid #000" }}
    treeData={[
        {
            key: "0",
            title: "node 0",
            children: [
                {
                    key: "0-2",
                    title: "node 0-2",
                    children: [
                        { key: "0-2-0", title: "node 0-2-0" },
                        { key: "0-2-1", title: "node 0-2-1" }
                    ]
                },

                { key: "0-4", title: "node 0-4" }
            ]
        },
        {
            key: "1",
            title: "node 1",

            children: [
                {
                    key: "1-0",
                    title: "node 1-0",
                    children: []
                }
            ]
        }
    ]}
/>

您需要导入默认的 css 样式。将此添加到您的 App.js 文件

import "rc-tree/assets/index.css";