<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>康健食疗诊所VIP用户登陆</title>
</head>
<body>
<br>
<br>
<form name="loginForm" method="get" action="testForm2.php" onsubmit="checkUser()">
用户名:<input type="text" name="loginName"><br><br>
密码:   <input type="password" name="userPassword"><br><br>
<input type="button" value="注册">
<input type="submit" value="登陆" >
</form>
<script>
function checkUser() {
var userName=document.getElementsByName('loginName');
var passWord=document.getElementsByName('userPassword');
if (userName.value==null || passWord.value==null){
alert('请先填写内容');
return false;
}
}
</script>
</body>
</html>
能够弹出窗口提示需要填写,但是关闭窗口后仍然会提交并切换到ACTION的页面