function registe(){
    if(checkusername()&&checkpassword()&&checksex()&&checkage()){
        document.reg.action="showinfo.jsp";
        document.reg.submit();
    }else 
    if(checkusername()==false){
        alert("用户名输入有误");
        document.reg.reset();
    }else
    if(checkpassword()==false){
        alert("密码输入有误");
        document.reg.reset();
    }else
    if(checksex()==false){
        alert("性别必须选择");
        document.reg.reset();
    }else
    if(checkage()==false){
        alert("年龄输入有误");
        document.reg.reset();
    }else
    if(checkaddress()==false){
        alert("地址是必须选择地");
        document.reg.reset();
    }
}
function checkusername(){
     var username=document.getElementById("username").value;
     var reg=/^[a-zA-Z][a-zA-Z0-9_]{6,10}$/;
     var result=reg.test(username);
     if(result){
         return true;
     }
     return false;
}
function checkpassword(){
    var password=document.getElementById("password").value;
    if(password.length>6&&password.length<10){
        return true;
    }
    return false;
}
function checkpasswordequals(){
    
    var password=document.getElementById("password").value;
    var repassword=document.getElementById("repassword").value;
    if(password==repassword){
        return true;
    }else{
        alert("两次输入密码不一致");
        document.getElementById("password").value="";
        document.getElementById("repassword").value="";
        document.getElementById("password").focus();
    }
}
function checksex(){
    var sex=document.getElementsByName("sex");
    var sex1=document.getElementsByName("sex").value;
    alert(sex1);
    var num=0;
    for(var i=0;i<sex.length;i++){
        if(sex[i].checked){
            num=num+1;
        }
    } 
    if(num==0){
        return false;
    }else{
        return true;
    }
}
function checkage(){
    var age=document.getElementById("age").value ;
    if(parseInt(age)>0&&parseInt(age)<150){
        return true;
    }
    return false;
}
function checkaddress(){
    var add1=document.getElementById("province").value;
    var add2=document.getElementById("city").value;
    if((add1==0)||(add2==1)){
        return false;
    }
    return true;
}