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1.这样的代码可以正常显示,操作正常

`{ topic.map(item => (
    <TreeNode title={item.name} key={item._id}>
      {
        part(item).map(p => (
          <TreeNode title={p.name} key={p._id} />
        ))
      }
    </TreeNode>
  ))}`
  

正常如图

clipboard.png

2.我想要在子节点的那一列的最后一个添加一个title是+的节点,所以添加了如下代码

{ topic.map(item => (
    <TreeNode title={item.name} key={item._id}>
      {
        part(item).map(p => (
          <TreeNode title={p.name} key={p._id} />
        ))
      }
      <TreeNode title="+" key={`${item._id}1`} /> //增加的那行代码
    </TreeNode>
))}

此时变为如下状况,不知为何

clipboard.png
代码复现

http://codepen.io/anon/pen/KW...


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