无法得到post过来的值,该怎么解决

无法得到post过来的值

Username
Password

初学php，为什么上面无法把name和password传到secret.php里，导致每次都输出Please input an effective username and password？
//secret.php
//Create short names for variables
if($_POST['name']==''&&$_POST['password']=='')
{
//Visitor need to enter a name and password
echo '

Please input an effective username and password

';
}
elseif($_POST['name']=='root'&&$_POST['password']=='123')
{
echo '

Welcome to the New World!

';
}
else
{
echo '

You are not welcome!

';
}
?>

------解决方案--------------------
需要为input控件增加name属性，只有这样，浏览器才会把值提交到服务器