diff --git a/static/js/index.js b/static/js/index.js
index 7df1a38..e47480c 100644
--- a/static/js/index.js
+++ b/static/js/index.js
@@ -122,6 +122,7 @@ class Game extends GameBasic {
         let { player } = this;
 
         if (player.health <= 0) {
+            let that = this;
             this.ws.close();
             this.ws = new WebSocket(origin);
             this.ws.addEventListener('message', function (e) { that.recv(e) });