test tree

src/component/tree/TreeNode.vue

@@ -101,6 +101,9 @@ function handleTitleClick(node: TreeData) {
   if (!node.isDisabled) {
     emit("node-click", node);
   }
+  if(props.showCheckbox){
+    node.isChecked = !node.isChecked
+  }
 }
 
 function handleRowClick(node: TreeData) {