身份证号校验（JavaScript）

1.简单校验

var p = /^[1-9]\d{5}(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/;

//true
console.log(p.test("11010519491231002X"));
//false 不能以0开头
console.log(p.test("01010519491231002X"));
//false 年份不能以17开头
console.log(p.test("11010517491231002X"));
//false 月份不能为13
console.log(p.test("11010519491331002X"));
//false 日期不能为32
console.log(p.test("11010519491232002X"));
//false 不能以a结尾
console.log(p.test("11010519491232002a"));

2.复杂校验

        2.1 地区校验

var checkProv = function (val) {
var pattern = /^[1-9][0-9]/;
var provs = {11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江 ",31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北 ",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"西藏 ",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门"};
  if(pattern.test(val)) {
	 if(provs[val]) {
		return true;
	 }
  }
	return false;
}

//true，34是安徽
console.log(checkProv(34));
//false，16不存在
console.log(checkProv(16));

        2.2 出生日期校验

var checkDate = function (val) {
    var pattern = /^(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)$/;
	if(pattern.test(val)) {
		var year = val.substring(0, 4);
		var month = val.substring(4, 6);
		var date = val.substring(6, 8);
		var date2 = new Date(year+"-"+month+"-"+date);
		if(date2 && date2.getMonth() == (parseInt(month) - 1)) {
			   return true;
			  }
		}
		return false;
}

//输出 true
console.log(checkDate("20180212"));
//输出 false 2月没有31日
console.log(checkDate("20180231"));

        2.3 校验码校验

var checkCode = function (val) {
	var p = /^[1-9]\d{5}(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/;
	var factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
	var parity = [ 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 ];
	var code = val.substring(17);
	if(p.test(val)) {
		var sum = 0;
		for(var i=0;i<17;i++) {
			sum += val[i]*factor[i];
		}
		if(parity[sum % 11] == code.toUpperCase()) {
			  return true;
		}
	}
	return false;
}

// 输出 true， 校验码相符
console.log(checkCode("11010519491231002X"));
// 输出 false， 校验码不符
console.log(checkCode("110105194912310021"));

        2.4 完整

var checkID = function (val) {
	if(checkCode(val)) {
		var date = val.substring(6,14);
		if(checkDate(date)) {
			 if(checkProv(val.substring(0,2))) {
			       return true;
			 }
		}
	}
	return false;
}

//true
console.log(checkID("11010519491231002X"));
//false，校验码不符
console.log(checkID("110105194912310021"));
//false，日期码不符
console.log(checkID("110105194902310026"));
//false，地区码不符
console.log(checkID("160105194912310029"));