From a8c0d5619ee6d518737628d6c585233d0bba23da Mon Sep 17 00:00:00 2001
From: louie <lshprung@yahoo.com>
Date: Sun, 20 Sep 2020 09:26:58 -0700
Subject: First commit

---
 pong.html | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 pong.html

(limited to 'pong.html')

diff --git a/pong.html b/pong.html
new file mode 100644
index 0000000..e0194be
--- /dev/null
+++ b/pong.html
@@ -0,0 +1,15 @@
+<div style='width:650px; height:300px;position:relative; border:1px solid #ccc'>
+    <b style='width:10px; height:10px; background:#000;position:absolute' id=ball></b>
+</div>
+<script>
+    var divH=document.querySelector('div').clientHeight,divW=document.querySelector('div').clientWidth;
+    var b=document.getElementById('ball'),x=divW/2-5,y=divH/2-5,dx=Math.random()*10-5,dy=Math.random()*10-5;
+    setInterval(function(){
+        b.style.left=x+'px';   b.style.top=y+'px';
+        x+=dx;
+        y+=dy;
+        if(y<1 || y>divH-11) dy=-dy;
+        if(x<1 || x>divW-11) dx=-dx;
+    },55);
+
+</script>
\ No newline at end of file
-- 
cgit