| 方法 | 含義 |
|---|---|
| Math.floor() | 向下取整 |
| Math.celi() | 向上取整 |
| Math.random() | 隨機生成0-1的數值 |
<!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>生成隨機數</title></head><body><div class="box"><spanstyle="background-color: lightblue; font-weight: 600; padding: 5px"></span></div><script>//生成0-1的隨機數 random// console.log(Math.floor(Math.random() * 4));//隨機生成驗證碼//首先建立一個字符串let str ="qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNNM1234567890";//把字符串轉為數組,并且分隔開字符let arr = str.split("");// 建立一個儲存數值的變量let result = "";for (let i = 0; i < 4; i++) {let n = Math.floor(Math.random() * arr.length);result += arr[n];}// 隨機生成顏色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());//把隨機生成的字符添加到span里面let yzm = document.querySelector(".box > span").append(result);////給span添加隨機顏色let Span = (document.querySelector(".box >span").style.color = show());</script></body></html>
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