递归函数获取索引

 renderItems = (data, index = [], bread = []) => {
    return data.map((item, i) => {
      item.index = [...index, i + 1]
      item.bread = [...bread, {
        title: item.name,
        path: item.path,
      }]
      if (item.children) {
        return (
          

            

              {item.name}
              
>
            
            {this.renderItems(item.children, item.index, item.bread)}
          
        );
      }
      return (
        

          {item.index.length <= 1 && }
          {item.index.length > 1 && }
          {item.name}
        
      )
    })
  }