- <html>
- <head>
- <script type="text/javascript">
- /*
- 有一分數序列：2/1，3/2,5/3,8/5,13/8,21/13.......求出這個數列的前20項的和
- */
- var n,t,sum = 0,a = 2, b = 1;
- for(var i = 1; i<=20; i++){
- sumsum = sum +a/b;
- t = a;
- a = a + b;
- b =t;
- }
- document.write(sum);
- </script>
- </head>
- <body>
- </body>
- </html>