element ui如果在点击父节点的时候获取它下面的所有子节点

Question

树的data数据是[{
          label: '一级 1',
          children: [{
            label: '二级 1-1',
            children: [{
              label: '三级 1-1-1'
            }]
          }]
        }, {
          label: '一级 2',
          children: [{
            label: '二级 2-1',
            children: [{
              label: '三级 2-1-1'
            }]
          }, {
            label: '二级 2-2',
            children: [{
              label: '三级 2-2-1'
            }]
          }]
        }, {
          label: '一级 3',
          children: [{
            label: '二级 3-1',
            children: [{
              label: '三级 3-1-1'
            }]
          }, {
            label: '二级 3-2',
            children: [{
              label: '三级 3-2-1'
            }]
          }]
        }]
点击一级 1的时候获取它下的所有子节点[{ label: '二级 1-1'},{ label: '三级 1-1-1'}]这样

Answer 1

在数据里面加上一个pid，点击1获取所有pid是1的对象