From 572b0453148ac66316dcabadbc9a7c1b966276d5 Mon Sep 17 00:00:00 2001
From: Zhiyuan Guo <zhiyuan.guo@ZhiyuandeMacBook-Pro.local>
Date: Sat, 8 Dec 2018 11:53:36 +0800
Subject: [PATCH] fix issue #13

---
 .gitignore  | 3 ++-
 src/Tree.js | 4 +---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index 1ba2a15..79819c6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 node_modules
 npm-debug.log
 .idea
-coverage
\ No newline at end of file
+coverage
+package-lock.json
\ No newline at end of file
diff --git a/src/Tree.js b/src/Tree.js
index 6969696..7d629c6 100644
--- a/src/Tree.js
+++ b/src/Tree.js
@@ -1,5 +1,3 @@
-let nodeId = 1
-
 /**
  * Tree data struct
  * Created by ayou on 2017/7/20.
@@ -13,7 +11,7 @@ let nodeId = 1
 const TreeNode = function (data) {
   const { id, isLeaf } = data
   // this.name = name
-  this.id = (typeof id === 'undefined') ? ('new' + nodeId++) : id
+  this.id = (typeof id === 'undefined') ? new Date().valueOf() : id
   this.parent = null
   // this.pid = null
   this.children = null