第十次作业
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>document</title>
</html>
<html>
<body>
<script src="ch13-1.js"></script>
</body>
</html>
var n = prompt("请输入数字n")
var num1 = 1;
var num2 = 1;
for(var i = 3;i<= n;i++){
var temp = num2;
num2 = num1 + num2;
num1 = temp;
}
alert(num2);
