diff --git a/game.js b/game.js
index 364a59c..9d0f6a2 100644
--- a/game.js
+++ b/game.js
@@ -242,10 +242,9 @@ function Game(id,options){
 		return item;
 	};
 	//获取对象列表
-	Stage.prototype.getItemsByType = function(){
-		var types = Array.prototype.slice.call(arguments,0);
+	Stage.prototype.getItemsByType = function(type){
 		var items = this.items.filter(function(item){
-			if(types.indexOf(item.type)>-1){
+			if(item.type==type){
 				return item;
 			}
 		});
diff --git a/index.js b/index.js
index f4c92d2..03a992d 100644
--- a/index.js
+++ b/index.js
@@ -106,16 +106,13 @@
 			update:function(){
 				if(this.map){
 					var stage = this;
-					var items = this.getItemsByType(1,2);
-					var hash = {};	//当前对象位置分布
+					var player = this.getItemsByType(1)[0];
+					var items = this.getItemsByType(2);
 					items.forEach(function(item){
-						var key = 'x'+item.coord.x+'y'+item.coord.y;  //坐标的标识
-						if(hash[key]){
-							if(hash[key]!=item.type){ //如果NPC与玩家相遇
-								stage.status = 2;
-							}
-						}else{
-							hash[key] = item.type;
+						var dx = item.x-player.x;
+						var dy = item.y-player.y;
+						if(dx*dx+dy*dy<750){
+							stage.status = 2;
 						}
 					});
 				}