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js 計算圓周率

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title></title>

</head>

<script type="text/javascript">

var sign =1;

var deno = 1; 

var sum =0;

var t = sign * 1 / deno

while(Math.abs(t)>10e-10){

sum +=t

sign = sign * -1;

deno += 2;

t = sign *1 /deno;

}

var pi =sum * 4;

alert("π的值為："+pi);

</script>

<body>

</body>

</html>

js
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