From 0b19508b43bc77286e2c3491821d45b62f8ba65c Mon Sep 17 00:00:00 2001
From: zsx <zsx@zsxsoft.com>
Date: Sat, 21 Mar 2015 23:04:17 +0800
Subject: [PATCH] =?UTF-8?q?=E5=B0=8FBUG=E4=BF=AE=E5=A4=8D?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lib/danmu/danmu/sprite.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/danmu/danmu/sprite.js b/lib/danmu/danmu/sprite.js
index 05794eb..3a366c6 100644
--- a/lib/danmu/danmu/sprite.js
+++ b/lib/danmu/danmu/sprite.js
@@ -41,7 +41,7 @@ module.exports = {
 			move: function() {
 				this.x += this.speed.x;
 				this.y += this.speed.y;
-				if (this.children !== null) {
+				if (!typeof this.children == "undefined") {
 					for (var i = 0; i < this.children.length; i++) {
 						this.children[i].speed = this.speed;
 						this.children[i].move();
@@ -53,7 +53,7 @@ module.exports = {
 			 * 向此精灵添加一个子精灵
 			 */
 			appendChild: function(sprite) {
-				if (this.children === null) {
+				if (typeof this.children == "undefined") {
 					this.children = [];
 				}
 				this.children.push(sprite);
@@ -63,7 +63,7 @@ module.exports = {
 			 * 渲染子精灵
 			 */
 			drawChildren: function() {
-				if (this.children !== null) {
+				if (!typeof this.children == "undefined") {
 					for (var i = 0; i < this.children.length; i++) {
 						this.children[i].draw();
 					}