正则实现二代身份证号码验证详解[通俗易懂]

IdCodeValid:function(code){
	//身份证号合法性验证
	//支持15位和18位身份证号
	//支持地址编码、出生日期、校验位验证
	var city={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 row={
		'pass':true,
		'msg':'验证成功'
	};
	if(!code || !/^\d{6}(18|19|20)?\d{2}(0[1-9]|1[012])(0[1-9]|[12]\d|3[01])\d{3}(\d|[xX])$/.test(code)){
		row={
			'pass':false,
			'msg':'身份证号格式错误'
		};
	}else if(!city[code.substr(0,2)]){
		row={
			'pass':false,
			'msg':'身份证号地址编码错误'
		};
	}else{
		//18位身份证需要验证最后一位校验位
		if(code.length == 18){
			code = code.split('');
			//∑(ai×Wi)(mod 11)
			//加权因子
			var factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
			//校验位
			var parity = [ 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 ];
			var sum = 0;
			var ai = 0;
			var wi = 0;
			for (var i = 0; i < 17; i++)
			{
				ai = code[i];
				wi = factor[i];
				sum += ai * wi;
			}
			if(parity[sum % 11] != code[17].toUpperCase()){
				row={
					'pass':false,
					'msg':'身份证号校验位错误'
				};
			}
		}
	}
	return row;
}

IdCodeValid('xxx');