<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>登录界面</title>
<script>
function inputNull(form)
{
for(i=0;i<form.length;i++)
{
if(form.elements[i].value=="")
{
alert("亲："+form.elements[i].placeholder+"不能为空");
form.elements[i].focus();
return false;
}
}
}
</script>
</head>
<body>
<form action="testlogin.php" method="post" onSubmit="return inputNull(this)">
用户名：<input type="text" placeholder="用户名" name="userName">
<br>
密 码：<input type="password" placeholder="密码" name="password">
<br>
<input type="submit" value="登录">
</form>
<a id="btn_register" href="#"><input type="submit" value="注册"></a>
</body>
</html>js检测用户名和密码不能为空
猜你喜欢
转载自blog.csdn.net/qq_42058441/article/details/85211965
今日推荐
周排行