JS to determine whether the login username and password is empty simple example _javascript skills

JS to determine whether the login username and password is empty simple example

<script type= "Text/javascript" >
//Verify that the input is not empty script code
function checkform (form) {
if ( Form.username.value = = "") {
alert ("User name cannot be empty!");
Form.username.focus ();
return false;
}
if (Form.password.value = = "") {
alert ("Password cannot be empty!");
Form.password.focus ();
return false;
}
return true;
}
</script>

PS Call if the table is monotonous use that is

<form action= "#" method= "POST" onsubmit= "return Checkform (this);" >

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