diff --git a/public/javascripts/jupyter.js b/public/javascripts/jupyter.js
index 62d85f325..c9afaaa24 100644
--- a/public/javascripts/jupyter.js
+++ b/public/javascripts/jupyter.js
@@ -17,22 +17,6 @@ function runEvery10Sec() {
 	setTimeout( runEvery10Sec, 1000 * 10 );
 }
 
-// function keyDown(e){
-// 	try {
-// 		e.preventDefault();
-// 		var currKey=0, e=e||event||window.event;
-// 		currKey = e.keyCode||e.which||e.charCode;
-// 		if(currKey == 83 && (e.ctrlKey||e.metaKey)){
-// 			console.log("点击了ctrl+s");
-// 			console.log("开始发送消息了ctrl+s");
-// 			window.parent.postMessage('jupytermessage','*');
-// 			return true;
-// 		}
-// 	}catch (e) {
-//
-// 	}
-// }
-// document.onkeydown = keyDown;
 $(function(){
 document.addEventListener('keydown', function(e){
 	if (e.keyCode == 83 && (navigator.platform.match("Mac") ? e.metaKey : e.ctrlKey)){