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<!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>JS-计算身份证校验码（最后一位）
原文地址：https://www.cnblogs.com/jffun-blog/p/10211958.html