js 验证身份证号码

<html>
 <head>
  <title>身份证测试</title>
    <script type="text/javascript">
		function isIdCardNo() {   		
			var tex = document.getElementById('identityid');
			var num = document.getElementById('identityid').value;
			//alert("您输入的身份证号码是:\n" + num);
			num = num.toUpperCase();  
			//身份证号码为15位或者18位,15位时全为数字,18位前17位为数字,最后一位是校验位,可能为数字或字符X。   
			if (!(/(^\d{15}$)|(^\d{17}([0-9]|X)$)/.test(num)))   
			{ 
                alert('输入的身份证号长度不对,或者号码不符合规定!\n身份证号码为15位时,应全为数字,\n身份证号码为18位时,末位可以为数字或X。');
				tex.value='';
				tex.focus();
				return false; 
			} 
			//校验位按照ISO 7064:1983.MOD 11-2的规定生成,X可以认为是数字10。 
			//下面分别分析出生日期和校验位 
			var len, re; 
			len = num.length;
			
			//当身份证为15位时的验证出生日期。
			if (len == 15) 
			{ 
				re = new RegExp(/^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/); 
				var arrSplit = num.match(re); 

				//检查生日日期是否正确 
				var dtmBirth = new Date('19' + arrSplit[2] + '/' + arrSplit[3] + '/' + arrSplit[4]); 
				var bGoodDay; 
				bGoodDay = (dtmBirth.getYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4])); 
				if (!bGoodDay){ 
					alert('输入的15位身份证号里出生日期不对!');   
					tex.value='';
					tex.focus();
					return false; 
				} 
				else{ 
				//将15位身份证转成18位 
				//校验位按照ISO 7064:1983.MOD 11-2的规定生成,X可以认为是数字10。 
					//var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); 
					//var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'); 
					//var nTemp = 0, i;   
					//num = num.substr(0, 6) + '19' + num.substr(6, num.length - 6); 
					//for(i = 0; i < 17; i ++){ 
					//	nTemp += num.substr(i, 1) * arrInt[i]; 
					//} 
					//num += arrCh[nTemp % 11]; 
					//alert("该15位身份证对应的18位是:" + num);
					//return num;   
				}   
			} 
			
			//当身份证号为18位时,校验出生日期和校验位。
			if (len == 18) 
			{ 
				var year = num.substr(6,4);
				//alert("year是:" + year);
				var nowDate = new Date();
				var nowYear = nowDate.getYear();
				if((nowYear - year) > 112){
					alert("依照输入的身份证出生日期截止到当前,本人已经超过112岁!");
					tex.value='';
					tex.focus();
					return false;
				}

				re = new RegExp(/^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/); 
				var arrSplit = num.match(re); 

				//检查生日日期是否正确 
				var dtmBirth = new Date(arrSplit[2] + "/" + arrSplit[3] + "/" + arrSplit[4]); 
				var bGoodDay; 
				bGoodDay = (dtmBirth.getFullYear() == Number(arrSplit[2])) && ((dtmBirth.getMonth() + 1) == Number(arrSplit[3])) && (dtmBirth.getDate() == Number(arrSplit[4])); 
				if (!bGoodDay){ 
					//alert(dtmBirth.getYear()); 
					//alert(arrSplit[2]); 
					alert('输入的18位身份证号里出生日期不对!'); 
					tex.value='';
					tex.focus();
					return false; 
				} 
				else{ 
					//检验18位身份证的校验码是否正确。 
					//校验位按照ISO 7064:1983.MOD 11-2的规定生成,X可以认为是数字10。 
					var valnum; 
					var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); 
					var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'); 
					var nTemp = 0, i; 
					for(i = 0; i < 17; i ++){ 
						nTemp += num.substr(i, 1) * arrInt[i]; 
					} 
					valnum = arrCh[nTemp % 11]; 
					if (valnum != num.substr(17, 1)){ 
						alert('18位身份证的最后一位校验码不正确!'); //应该为:' + valnum
						tex.value='';
						tex.focus();
						return false; 
					} 
					//return num; 
				} 
			} 
			
			//验证地区是否有效
			var aCity={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 "}
			if(aCity[parseInt(num.substr(0,2))] == null){
				alert("输入的身份证号前两位地区不对!");
				tex.value='';
				tex.focus();
				return false;
			}
			
			alert("正确了!");
			return false; 			
}   
	</script>
 </head>
  <body>
   请输入身份证号:<input name="identityid" id="identityid" type="text" class="shopLoginMainRight0202010202010101" maxlength="18" onblur="isIdCardNo()" />
   <input type="button" value = "check" onclick="isIdCardNo()"/>
  </body> 
</html>

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