console
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>
键盘事件应用
</title>
<script type="text/javascript">
function checkNo(){
if(window.event.keyCode!=13){
if(event.keyCode<48||event.keyCode>57){
alert("学号输入错误！！");
}else{
if(myform.sno.value.lenth<=0){alert("你学号没输！！！！")}
else{alert("你的学号是："+myform.sno.value);}
}
}function checkName(){
if(window.event.keyCode==13){alert("your name is :"+myform.sname.value);}
}
}
</script>
</head>
<body>
<h1>
键盘事件应用
</h1>
<form name="myform" method="POST"action="">
学号：<input type="text"name="sno"id="sno"onkeypress="checkNo()">必须为数字<br>
姓名：<input type="text"name="sname"id="sname"onkeypress="checkName()">回车显示姓名<br>
<input type="submit"value="提交"><input type="reset">
</form>
</body>
</html>