<Tree :data="treeData" ref="tree" :render="renderContent"></Tree>

export const treeData= [
  {
    title: 'parent 1',
    expand: true,
    selected: true,
    value: '1',
    children: [
      {
        title: 'parent 1-1',
        expand: true,
        value: '11',
        children: [
          {
            value: '111',
            title: 'leaf 1-1-1'
          },
          {
            value: '112',
            title: 'leaf 1-1-2'
          }
        ]
      },
      {
        title: 'parent 1-2',
        value: '12',
        expand: true,
        children: [
          {
            value: '121',
            title: 'leaf 1-2-1'
          },
          {
            value: '122',
            title: 'leaf 1-2-2'
          }
        ]
      }
    ]
  }
];

// 子节点的option
 renderContent (h, { root, node, data }) {
      return h('Option', {
          style: {
            display: 'inline-block',
            margin: '0'
          },
          props:{
            value: data.value
          }
        }, data.title);
    },