JS Math对象
<!DOCTYPE html>
<html lang="en">
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Math对象</title>
</head>
<meta charset="UTF-8">
<title>Math对象</title>
</head>
<body>
<script>
document.write(Math.PI) // 圆周率
document.write("<br/>")
<script>
document.write(Math.PI) // 圆周率
document.write("<br/>")
document.write(Math.SQRT2) // 2 的平方根
document.write("<br/>")
//向上取整
document.write(Math.ceil(3.133)); //4
document.write("<br/>")
//向下取整
document.write(Math.floor(5.324234)) //5
document.write("<br/>")
//幂运算
document.write(Math.pow(4, 2)) //16
document.write("<br/>")
//平方根
document.write(Math.sqrt(4)) //2
document.write("<br/>")
//最小值
document.write(Math.min(1, 2, 3, 4, 5, 6, 7)) //1
document.write("<br/>")
//最大值
document.write(Math.max(1, 2, 3, 4, 5, 6, 7)) //7
document.write("<br/>")
//0~1之间的随机数
document.write(Math.random())
document.write("<br/>")
//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 + "<br/>")
}*/
//Math.round 四舍五入(仅保留整数位)
</script>
</body></html>
document.write("<br/>")
//向上取整
document.write(Math.ceil(3.133)); //4
document.write("<br/>")
//向下取整
document.write(Math.floor(5.324234)) //5
document.write("<br/>")
//幂运算
document.write(Math.pow(4, 2)) //16
document.write("<br/>")
//平方根
document.write(Math.sqrt(4)) //2
document.write("<br/>")
//最小值
document.write(Math.min(1, 2, 3, 4, 5, 6, 7)) //1
document.write("<br/>")
//最大值
document.write(Math.max(1, 2, 3, 4, 5, 6, 7)) //7
document.write("<br/>")
//0~1之间的随机数
document.write(Math.random())
document.write("<br/>")
//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 + "<br/>")
}*/
//Math.round 四舍五入(仅保留整数位)
</script>
</body></html>