<!DOCTYPE html><html lang="en"><head> <title>Document</title> <style> #msg{ color: red; } </style></head><body> 身份证号：<input id="id-card" type="text">（前17位）<br> （校验位）最后一位为：<span id="msg"></span><span id="check-digit"></span><br> <button onclick="calculate()">计算</button><br> <script> "use strict"; // 前17位每项的系数 let coefficient = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2]; // 除11取余的结果对应的校验位（最后一位）的值 let checkDigitMap = [‘1‘, ‘0‘, ‘X‘, ‘9‘, ‘8‘, ‘7‘, ‘6‘, ‘5‘, ‘4‘, ‘3‘, ‘2‘]; function calculate(){ var idCard = document.querySelector("#id-card"); var checkDigit = document.querySelector("#check-digit"); var msg = document.querySelector("#msg"); var sum = 0; checkDigit.innerHTML = msg.innerHTML = ""; if(idCard.value.length < 17){ msg.innerHTML = "至少输入身份证前17位"; return } for (var i = 0; i < 17; i++) { sum += idCard.value[i] * coefficient[i]; } checkDigit.innerHTML = checkDigitMap[sum % 11]; } </script></body></html>
