JS验证身份证号

function IdentityCodeValid(code) {
		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 tip = "";
		var pass= true;
	
		if(!code || !/^\d{6}(18|19|20)?\d{2}(0[1-9]|1[012])(0[1-9]|[12]\d|3[01])\d{3}(\d|X)$/i.test(code)){
			tip = "身份证号格式错误";
			pass = false;
		}
	
		else if(!city[code.substr(0,2)]){
			tip = "地址编码错误";
			pass = false;
		}
		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;
				}
				var last = parity[sum % 11];
				if(parity[sum % 11] != code[17]){
					tip = "校验位错误";
					pass =false;
				}
			}
		}
		if(!pass) {
			showerror(1,tip,$('.itembox').eq(1));
			$("body,html").animate({scrollTop: $("input[name=identity]").offset().top - 30}, "fast");
		}
		return pass;
	};