问题

Tree组件默认无法获取父节点id

解决方案

没有实现按需引入

node_modules->element-ui->lib->element.ui.common.js 25382行修改源码
去掉 includeHalfChecked &&

  childNodes.forEach(function (child) {
        // if ((child.checked || includeHalfChecked && child.indeterminate) && (!leafOnly || leafOnly && child.isLeaf)) {
        //   checkedNodes.push(child.data);
        // }
        if ((child.checked || child.indeterminate) && (!leafOnly || leafOnly && child.isLeaf)) {
          checkedNodes.push(child.data);
        }

实现按需引入

node_modules->element-ui->lib->tree.js 1051行修改源码
去掉 includeHalfChecked &&

  childNodes.forEach(function (child) {
        // if ((child.checked || includeHalfChecked && child.indeterminate) && (!leafOnly || leafOnly && child.isLeaf)) {
        //   checkedNodes.push(child.data);
        // }
        if ((child.checked || child.indeterminate) && (!leafOnly || leafOnly && child.isLeaf)) {
          checkedNodes.push(child.data);
        }