Without further ado, let's take a look with the editor
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:///TR/xhtml1/DTD/">
<html xmlns="http:///1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
function validation() {
var val = ("txtNumber").value;
var regu = /^((-\d+)|(0+))$/;
if (val != "") {
if (!(val)) {
("labResult"). = "red";
("labResult").innerHTML = "Verification failed!";
} else {
("labResult"). = "green";
("labResult").innerHTML = "Verification was successful!";
}
}
}
</script>
</head>
<body>
<input name="txtNumber" type="text" />
<input name="btnValidation" type="button" value="check" onclick="validation()" />
Verification results：<label ></label>
</body>
</html>
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