$(document).ready(function(){		$("#dianji").click(function(){			var card = $("#card").val();			card=card.replace(/^\s+|\s+$/g,"");			if(card==""){				alert("身份证号码不能为空！");			}else if(card.lengt!=15 && card.length!=18){				alert("身份证只能是15位或者是18位");			}else if(card.match(/^\d{14,17}(\d|X)$/gi)==null){				alert("身份证只能是15位或者是18位");			}else if(card.length==18){				if(!checkIdCard.province(card)||!checkIdCard.brithday18(card)||!checkIdCard.validate(card)){					alert("身份证不合法");				}else{					var year=card.substr(6,4);            		var month=card.substr(10,2);            		var day=card.substr(12,2);					var temp = year+"-"+month+"-"+day;					$("#date").val(temp);					if(parseInt(card.substr(16,1))%2==0){						alert("女");					}else{						alert("男");					}				}			}else if(card.length==15){				if(!checkIdCard.province(card)||!checkIdCard.brithday15(card)){					alert("身份证不合法");				}else{					alert("身份证合法");				}			}		});	});		/*else if(card.match(/^\d{14,17}(\d|X)$/gi)){				alert("身份证号码须为18位或15位数字");			}*/ var checkIdCard={        //Wi 加权因子 Xi 余数0~10对应的校验码 Pi省份代码        Wi:[7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2],        Xi:[1,0,"X",9,8,7,6,5,4,3,2],        Pi:[11,12,13,14,15,21,22,23,31,32,33,34,35,36,37,41,42,43,44,45,46,50,51,52,53,54,61,62,63,64,65,71,81,82,91],         //检验18位身份证号码出生日期是否有效        //parseFloat过滤前导零，年份必需大于等于1900且小于等于当前年份，用Date()对象判断日期是否有效。        brithday18:function(sIdCard){            var year=parseFloat(sIdCard.substr(6,4));            var month=parseFloat(sIdCard.substr(10,2));            var day=parseFloat(sIdCard.substr(12,2));            var checkDay=new Date(year,month-1,day);            var nowDay=new Date();            if (1900<=year && year<=nowDay.getFullYear() && month==(checkDay.getMonth()+1) && day==checkDay.getDate()) {                return true;            };        },         //检验15位身份证号码出生日期是否有效        brithday15:function(sIdCard){            var year=parseFloat(sIdCard.substr(6,2));            var month=parseFloat(sIdCard.substr(8,2));            var day=parseFloat(sIdCard.substr(10,2));            var checkDay=new Date(year,month-1,day);            if (month==(checkDay.getMonth()+1) && day==checkDay.getDate()) {                return true;            };        },         //检验校验码是否有效        validate:function(sIdCard){            var aIdCard=sIdCard.split("");            var sum=0;            for (var i = 0; i < checkIdCard.Wi.length; i++) {                sum+=checkIdCard.Wi[i]*aIdCard[i]; //线性加权求和            };            var index=sum%11;//求模，可能为0~10,可求对应的校验码是否于身份证的校验码匹配            if (checkIdCard.Xi[index]==aIdCard[17].toUpperCase()) {                return true;            };        },         //检验输入的省份编码是否有效        province:function(sIdCard){            var p2=sIdCard.substr(0,2);            for (var i = 0; i < checkIdCard.Pi.length; i++) {                if(checkIdCard.Pi[i]==p2){                    return true;                };            };        }    };

参考：

http://www.dewen.org/q/1236/%E6%B1%82%E8%A7%A3%EF%BC%9Ajs%E9%AA%8C%E8%AF%81%E8%BA%AB%E4%BB%BD%E8%AF%81%E5%8F%B7%E7%9A%84%E9%97%AE%E9%A2%98