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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>
- var num = 3.19;
- // 四舍五入
- // console.log(Math.round(num));
- // 向下取整
- // console.log(Math.floor(num));
- // 向上取整
- // console.log(Math.ceil(num));
- console.log(Math.pow(2,3));
-
- </script>
- </body>
- </html>
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