严格验证身份证格式

function testId(value) {
		var vcity = {
			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"
		};

    // 判断是否为空
    isEmpty = function(card){
    	if (/^\s*$/.test(card) === true) {
    		return true;
    	}else{
        	return false;
        }
    }
    //检查号码是否符合规范，包括长度，类型  
    isCardNo = function (card) {
    	if( isEmpty(card) ){
    		return true;
    	}
        //身份证号码为15位或者18位，15位时全为数字，18位前17位为数字，最后一位是校验位，可能为数字或字符X  
        var reg = /(^\d{15}$)|(^\d{17}(\d|X)$)/;
        if (reg.test(card) === false) {
        	return false;
        }
       

        return true;
    };

    //取身份证前两位,校验省份  
    checkProvince = function (card) {
    	if( isEmpty(card) ){
    		return true;
    	}
    	var province = card.substr(0, 2);
    	if (vcity[province] == undefined) {
    		return false;
    	}
    	return true;
    };

    //检查生日是否正确  
    checkBirthday = function (card) {
    	if( isEmpty(card) ){
    		return true;
    	}
    	var len = card.length;
        //身份证15位时，次序为省（3位）市（3位）年（2位）月（2位）日（2位）校验位（3位），皆为数字  
        if (len == '15') {
        	var re_fifteen = /^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/;
        	var arr_data = card.match(re_fifteen);
        	var year = arr_data[2];
        	var month = arr_data[3];
        	var day = arr_data[4];
        	var birthday = new Date('19' + year + '/' + month + '/' + day);
        	return verifyBirthday('19' + year, month, day, birthday);
        }
        //身份证18位时，次序为省（3位）市（3位）年（4位）月（2位）日（2位）校验位（4位），校验位末尾可能为X  
        if (len == '18') {
        	var re_eighteen = /^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/;
        	var arr_data = card.match(re_eighteen);
        	var year = arr_data[2];
        	var month = arr_data[3];
        	var day = arr_data[4];
        	var birthday = new Date(year + '/' + month + '/' + day);
        	return verifyBirthday(year, month, day, birthday);
        }
        return false;
    };

    //校验日期  
    verifyBirthday = function (year, month, day, birthday) {
    	var now = new Date();
    	var now_year = now.getFullYear();
        //年月日是否合理  
        if (birthday.getFullYear() == year && (birthday.getMonth() + 1) == month && birthday.getDate() == day) {
            //判断年份的范围（3岁到100岁之间)  
            var time = now_year - year;
            if (time >= 3 && time <= 100) {
            	return true;
            }
            return false;
        }
        return false;
    };

    //校验位的检测  
    checkParity = function (card) {
    	if( isEmpty(card) ){
    		return true;
    	}
        //15位转18位  
        card = changeFivteenToEighteen(card);
        var len = card.length;
        if (len == '18') {
        	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 cardTemp = 0, i, valnum;
        	for (i = 0; i < 17; i++) {
        		cardTemp += card.substr(i, 1) * arrInt[i];
        	}
        	valnum = arrCh[cardTemp % 11];
        	if (valnum == card.substr(17, 1)) {
        		return true;
        	}
        	return false;
        }
        return false;
    };

    //15位转18位身份证号  
    changeFivteenToEighteen = function (card) {
    	if( isEmpty(card) ){
    		return true;
    	}
    	if (card.length == '15') {
    		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 cardTemp = 0, i;
    		card = card.substr(0, 6) + '19' + card.substr(6, card.length - 6);
    		for (i = 0; i < 17; i++) {
    			cardTemp += card.substr(i, 1) * arrInt[i];
    		}
    		card += arrCh[cardTemp % 11];
    		return card;
    	}
    	return card;
    };

    //checkCard = function () {
    var card = value;

    if(isEmpty(card)){ // 如果身份证为空，则直接返回false;
      return false; // 如果这返回true,则表示可以为空
    }
    //校验长度，类型  
    if (isCardNo(card) === false) {
        alert('您输入的身份证号码不正确，请重新输入');
        //document.getElementById('card_no').focus;
        return false;
    }
    //检查省份  
    if (checkProvince(card) === false) {
    	return false;
    }
    //校验生日  
    if (checkBirthday(card) === false) {
    	return false;
    }
    //检验位的检测  
    if (checkParity(card) === false) {
    	return false;
    }

    return true;
}