<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
// 編寫一個函數,輸入n爲偶數時,調用函數求1/2+1/4+...+1/n,當輸入n爲奇數時,調用函數求1+1/3+...+1/n
function addSum(n) {
//用來存放數字的和
var sum = 0;
//根據輸入數字的奇偶決定i的值
var i = n % 2 == 0?2:1;
for(;i <= n; i += 2){
sum += 1/i;
}
alert(sum);
}
addSum(10);
</script>
</body>
</html>