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- <!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>
- console.log(Math.PI);//π
- console.log(Math.E);
- console.log(Math.ceil(54.23)); //向上取整
- console.log(Math.floor(7.9)); //向下取整
- console.log(Math.round(4.26)); //四舍五入
- console.log(Math.abs(-2));//绝对值
- console.log(Math.sqrt(49));//算术平方根
- console.log(Math.pow(2,4));//x的y次幂
- console.log(Math.random() * 12)//随机数
- // 固定范围内随机数取整
- Math.round(Math.random() * (y-x) + x);
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- </script>
- </body>
- </html>
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