验证身份证的js代码片段

//验证身份证号码是否正确
function checkIDCard(idCardNum){
	var idNum = idCardNum;

	var errors = new Array(
		"验证通过",
		"身份证号码位数不对",
		"身份证含有非法字符",
		"身份证号码校验错误",
		"身份证地区非法",
		"身份证出生日期不对"
 	);

	//身份号码位数及格式检验
	var re;
	var len = idNum.length;

	//身份证位数检验
	if(len != 15 && len != 18){
		return errors[1];
	}else if(len == 15){
		re = new RegExp(/^(\d{6})()?(\d{2})(\d{2})(\d{2})(\d{3})$/);
	}else{
		re = new RegExp(/^(\d{6})()?(\d{4})(\d{2})(\d{2})(\d{3})([0-9xX])$/); 
	}

	var area={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",
		91:"国外"}

	var idcard_array = new Array();
	idcard_array = idNum.split("");

	//地区检验
	if(area[parseInt(idNum.substr(0,2))] == null) {
		return errors[4];
	}

	//出生日期正确性检验
	var a = idNum.match(re);

	if (a != null){
		if (len==15){
			var DD = new Date("19"+a[3]+"/"+a[4]+"/"+a[5]);
			var flag = DD.getYear()==a[3]&&(DD.getMonth()+1)==a[4]&&DD.getDate()==a[5];
		}else if(len == 18){
			var DD = new Date(a[3]+"/"+a[4]+"/"+a[5]);
			var flag = DD.getFullYear()==a[3]&&(DD.getMonth()+1)==a[4]&&DD.getDate()==a[5];
		}

		if (!flag) {
			return errors[5]; 
		}                     

		//检验校验位
		if(len == 18){
			S = (parseInt(idcard_array[0]) + parseInt(idcard_array[10])) * 7
				+ (parseInt(idcard_array[1]) + parseInt(idcard_array[11])) * 9
				+ (parseInt(idcard_array[2]) + parseInt(idcard_array[12])) * 10
				+ (parseInt(idcard_array[3]) + parseInt(idcard_array[13])) * 5
				+ (parseInt(idcard_array[4]) + parseInt(idcard_array[14])) * 8
				+ (parseInt(idcard_array[5]) + parseInt(idcard_array[15])) * 4
				+ (parseInt(idcard_array[6]) + parseInt(idcard_array[16])) * 2
				+ parseInt(idcard_array[7]) * 1 
				+ parseInt(idcard_array[8]) * 6
				+ parseInt(idcard_array[9]) * 3 ;

			Y = S % 11;
 	   M = "F"; 
 	   JYM = "10X98765432";
 	   M = JYM.substr(Y,1);//判断校验位

			//检测ID的校验位
			if(M == idcard_array[17]){ 
				return errors[0]; 
			}else{
				return errors[3];
			} 
		}
	}else{
		return errors[2];
	}
  return errors[0];
}