JS Math对象

<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<title>Math对象</title>
</head>

<body>
 <script>
 document.write(Math.PI) // 圆周率
 document.write(" ")

document.write(Math.SQRT2) // 2 的平方根
 document.write(" ")
 //向上取整
 document.write(Math.ceil(3.133)); //4
 document.write(" ")
 //向下取整
 document.write(Math.floor(5.324234)) //5
 document.write(" ")
 //幂运算
 document.write(Math.pow(4, 2)) //16
 document.write(" ")
 //平方根
 document.write(Math.sqrt(4)) //2
 document.write(" ")
 //最小值
 document.write(Math.min(1, 2, 3, 4, 5, 6, 7)) //1
 document.write(" ")
 //最大值
 document.write(Math.max(1, 2, 3, 4, 5, 6, 7)) //7
 document.write(" ")
 //0~1之间的随机数
 document.write(Math.random())
 document.write(" ")
 //1~100之间的随机数
 /* for (var a = 0; a <= 101; a++) {
 var s = Math.floor(Math.random() * 100) + 1
 document.write(s + " ")
 }*/
 //Math.round 四舍五入（仅保留整数位）
 </script>
</body></html>