📢前言
代码取自开源项目50projects50days,用作个人学习和巩固三件套的知识,增加了注释,可能会有小改动。
在线演示地址
📝实现思路及效果

注意一下几点:
- 各元素的位置与显示格式,尤其是对于justify-content,属性值为flex-start还是center
- 生成密码内容的位置不要先入为主想成input
calc
的用法,详情见代码注释
- 监听固定的几个按钮(复制、生成、5项规则),使用Math.random()生成所需字符,构建密码
- 复制原理的实现:将生成的字符串放置到新创建的textarea中,使用select()选中该区域的文本,使用copy命令复制成功后,将创建的textarea移除
💻代码
index.html
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| <!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"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css" integrity="sha512-1PKOgIY59xJ8Co8+NE6FZ+LOAZKjy+KY8iq0G4B3CyeY6wYHN3yt9PW0XpSriVlkMXe40PTKnXrLnZ9+fkDaog==" crossorigin="anonymous" /> <link rel="stylesheet" href="style.css"> <title>随机密码生成</title> </head> <body> <div class="container"> <div class="result-container"> <span id="result"></span> <button class="btn" id="clipboard"> <i class="far fa-clipboard"></i> </button> </div>
<div class="settings"> <div class="setting"> <label>密码长度</label> <input type="number" id="length" min="4" max="20" value="20"> </div> <div class="setting"> <label>包括大写字母</label> <input type="checkbox" id="uppercase" checked> </div> <div class="setting"> <label>包括小写字母</label> <input type="checkbox" id="lowercase" checked> </div> <div class="setting"> <label>包括数字</label> <input type="checkbox" id="numbers" checked> </div> <div class="setting"> <label>包括特殊符号</label> <input type="checkbox" id="symbols" checked> </div> </div>
<button class="btn btn-large" id="generate">生成密码</button> </div> <script src="script.js"></script> </body> </html>
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style.css
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| @import url('https://fonts.googleapis.com/css?family=Muli&display=swap');
* { box-sizing: border-box; }
body { background-color: #3b3b98; color: #fff; font-family: 'Muli', sans-serif; display: flex; flex-direction: column; justify-content: center; align-items: center; height: 100vh; overflow: hidden; margin: 0; padding: 10px; }
h2 { margin: 10px 0 20px; text-align: center; }
.container { background-color: #23235b; box-shadow: 0 2px 10px rgba(255, 255, 255, 0.2); padding: 20px; width: 350px; max-width: 100%; }
.result-container { background-color: rgba(0, 0, 0, 0.4); display: flex; justify-content: flex-start; align-items: center; position: relative; font-size: 18px; letter-spacing: 1px; padding: 12px 10px; height: 50px; width: 100%; }
.result-container #result { word-wrap: break-word; max-width: calc(100% - 40px); overflow-y: scroll; height: 100%; }
#result::-webkit-scrollbar { width: 1rem; }
.result-container .btn { position: absolute; top: 5px; right: 5px; width: 40px; height: 40px; font-size: 20px; }
.btn { border: none; background-color: #3b3b98; color: #fff; font-size: 16px; padding: 8px 12px; cursor: pointer; }
.btn-large { display: block; width: 100%; }
.setting { display: flex; justify-content: space-between; align-items: center; margin: 15px 0; }
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script.js
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| const resultEl = document.getElementById('result')
const lengthEl = document.getElementById('length') const uppercaseEl = document.getElementById('uppercase') const lowercaseEl = document.getElementById('lowercase') const symbolsEl = document.getElementById('symbols') const numbersEl = document.getElementById('numbers')
const generateEl = document.getElementById('generate')
const clipboardEl = document.getElementById('clipboard')
const randomFunc = { lower: getRandomLower, upper: getRandomUpper, number: getRandomNumber, symbol: getRandomSymbol }
function generatedPassword(lower, upper, number, symbol, length) { let generatedPassword = '' const typesCount = lower + upper + number + symbol const typesArr = [{lower}, {upper}, {number}, {symbol}].filter(item => Object.values(item)[0])
if(typesCount === 0) { return '' }
for(let i = 0; i < length; i += typesCount) { typesArr.forEach(type => { const funcName = Object.keys(type)[0] generatedPassword += randomFunc[funcName]() }) }
const finalPassword = generatedPassword.slice(0, length)
return finalPassword }
function getRandomLower() { return String.fromCharCode(Math.floor(Math.random() * 26 + 97)) }
function getRandomUpper() { return String.fromCharCode(Math.floor(Math.random() * 26) + 65) }
function getRandomNumber() { return String.fromCharCode(Math.floor(Math.random() * 10) + 48) }
function getRandomSymbol() { const symbols = '!@#$%^&*(){}[]=<>/,.' return symbols[Math.floor(Math.random() * symbols.length)] }
clipboardEl.addEventListener('click', () => { const textarea = document.createElement('textarea') const password = resultEl.innerText
if(!password) { return }
textarea.value = password document.body.appendChild(textarea) textarea.select() document.execCommand('copy') textarea.remove() alert('密码成功复制至剪贴板!') })
generateEl.addEventListener('click', () => { const length = +lengthEl.value const hasLower = lowercaseEl.checked const hasUpper = uppercaseEl.checked const hasNumber = numbersEl.checked const hasSymbol = symbolsEl.checked
resultEl.innerText = generatedPassword(hasLower, hasUpper, hasNumber, hasSymbol, length) })
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