<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
function checkDatas(obj){
if(obj.username.value=='' || obj.password.value==''){
alert('用户名或密码不可为空！');
return false;
}else{
if(obj.password.value!==obj.rpassword.value){
alert('请确认两次输入密码是否一致！');
return false;
}else{
return true;
}
}
}
</script>
</head>
<body>
<form action="./2.php" method="post" onsubmit="return checkDatas(this);">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" name="username" value="" /></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="password" name="password" value="" /></td>
</tr>
<tr>
<td>确认密码：</td>
<td><input type="password" name="rpassword" value="" /></td>
</tr>
<tr>
<td>仅可输入小数点和数字：</td>
<td><input type="text" name="num01" value="" onkeyup="this.value=this.value.replace(/[^\d\.]/g,'');" /></td>
</tr>
<tr>
<td>仅可输入负号、小数点和数字：</td>
<td><input type="text" name="num02" value="" onkeyup="this.value=this.value.replace(/[^\d\.\-]/g,'');" /></td>
</tr>
</table>
<input type="submit" value="登录">
</form>
</body>
</html>
