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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>
- // 变量
- var a = '1';
- // 字面量 1 2 3 4 true '哈哈'
- console.log(Math.PI);//π
- console.log(Math.E);//常量
- console.log(Math.pow(2,6));//x的y次幂
- console.log(Math.ceil(12.3));//向上取整
- console.log(Math.floor(12.4));//向下取整
- console.log(Math.abs(-2));//绝对值
- console.log(Math.sqrt(81));//算术平方根
- console.log(Math.round(2.7));//四舍五入
- console.log(Math.random()*10);//随机数
- // 随机数x-y取整
- // Math.round(Math.random() * (y-x) + x)
- console.log(Math.round(Math.random() * (10-1) + 1));
- </script>
- </body>
- </html>
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