html

<!-- 圖形驗證碼 --><div class="phone"><div class="phones"><div class="img"><img src="./img/yanzhnegma.png" alt=""></div><div class="input"><input type="number" name="" id="" placeholder="圖形驗證碼"></div></div><div class="yan"><div class="code" id="codes" onclick="createCode()"></div></div></div>

js

<script type="text/javascript">var code;window.onload = function css() {createCode();}function createCode() {code = "";var codeLength = 4; //驗證碼的長度var codes = document.getElementById("codes");var charNum= new Array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9,'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z','A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'); //隨機數（包括中文）for (var i = 0; i < codeLength; i++) {var Name = Math.floor(Math.random() * 52);code += charNum[Name];}if (codes) {codes.className = "code";codes.innerHTML = code;}} </script>

css

.phone {width: 90%;height: 40px;margin: auto;border-radius: 20px;background: #40B450;display: flex;align-items: center;margin-top: 20px;}.phones {width: 76%;display: flex;}.yan {width: 80px;height: 40px;background: #B3E1B9;color: #178226;font-size: 14px;display: flex;align-items: center;justify-content: center;border-radius: 0 20px 20px 0;}.code {font-style: italic;color: #178226;font-size: 16px;padding: 2px 3px;letter-spacing: 3px;font-weight: bolder;line-height: 60px;text-align: center;}

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