| 方法 | 含义 |
|---|---|
| Math.floor() | 向下取整 |
| Math.celi() | 向上取整 |
| Math.random() | 随机生成0-1的数值 |
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><meta http-equiv="X-UA-Compatible" content="IE=edge" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>生成随机数</title></head><body><div class="box"><spanstyle="background-color: lightblue; font-weight: 600; padding: 5px"></span></div><script>//生成0-1的随机数 random// console.log(Math.floor(Math.random() * 4));//随机生成验证码//首先建立一个字符串let str ="qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNNM1234567890";//把字符串转为数组,并且分隔开字符let arr = str.split("");// 建立一个储存数值的变量let result = "";for (let i = 0; i < 4; i++) {let n = Math.floor(Math.random() * arr.length);result += arr[n];}// 随机生成颜色function show() {let r = Math.floor(Math.random() * (255 + 1));let g = Math.floor(Math.random() * (255 + 1));let b = Math.floor(Math.random() * (255 + 1));let rgb = "rgb" + "(" + r + "," + g + "," + b + ")";return rgb;}// console.log(show());//把随机生成的字符添加到span里面let yzm = document.querySelector(".box > span").append(result);////给span添加随机颜色let Span = (document.querySelector(".box >span").style.color = show());</script></body></html>
Copyright 2014-2025 https://www.php.cn/ All Rights Reserved | php.cn | 湘ICP备2023035733号
收藏
