javascript身份证简单校验

$(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;
};
};
}
};