Calculate the accuracy of the last digit based on the ID number. If it is incorrect, the correct result will be given. It is a very interesting program.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>javascript 18位身份证号码最后一位校验码</title>
</head>
<body>
<script>
function getIDChar18(id) {
var arr = id.split(''), sum = 0, vc = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
for (var i = 0; i < 17; i++) sum += vc[i] * parseInt(arr[i]);
return ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'][sum % 11];
}
function ValidID(id) {
if (/^\d{18}$/.test(id)) {
var c = id.charAt(17), rc = getIDChar18(id);
if (c == rc) showRst('您输入的18位身份证号码正确！<br>生日：' + id.substr(6, 8) + '<br>性别：' + ['女', '男'][parseInt(id.charAt(16)) % 2]);
else showRst('您输入的18位身份证号码检验码错误，18位校验码应该为' + rc + '！');
}
else showRst('请输入18位数字的身份证号码！');
}
function showRst(msg) {document.getElementById('rst').innerHTML=msg }
</script>
<input type="text" onblur="ValidID(this.value)" />
<div id="rst"></div>
</body>
</html>
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