el-tree指定节点不可选中

        <el-scrollbar style="height:93%;">
          <el-tree
            ref="treeForm"
            :data="treeData"
            highlight-current
            node-key="id"
            show-checkbox
            check-strictly
            :filter-node-method="filterNode"
            :default-expanded-keys="[tree_default_check]"
            :accordion="true"
            :expand-on-click-node="false"
            :check-on-click-node="false"
            :props="treeProp"
            @check-change="handleClick"
          >
            <span slot-scope="{ node, data }">
              <i :class="icons[data.type]" />
              <span style="margin-left:5px;" :title="data.name">{{ data.name }}</span>
            </span>
          </el-tree>
        </el-scrollbar>


      treeProp: {
        disabled: function(data, node) {
          if (data.type === 'class') {
            return !data.leaf
          }
        }
      }