lovecoding
/
W260426


			
							123456789101112131415161718192021222324252627
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 计算pi的近似值
        function Pi(n){
            var sum = 0;
            // Math.pow(-1,n-1)*(1/(2*n-1))
            for(var i=1;i<=n;i++){
                sum += Math.pow(-1,i-1)*(1/(2*i-1));
            }
            return sum*4;
        }
        console.log(Pi(100));
        console.log(Pi(500));
        console.log(Pi(1000));
        console.log(Pi(10000));


    </script>
</body>
</html>