<script>
function gog(){
var name = name.value;
var psw = psw.value;
if(name!=null && name !=''){
if(psw!=null && psw !=''){
window.location="b.jsp";
}else alert('密码不能为空!');
}else alert("姓名不能为空!");
}
</script>
<input type="text" id = "name" >
<input type="text" id="psw">