<html>
<head>
</head>
<body id="body">
<form action="javascript:void(0);" id="exampleForm">
<input type="password" id="examplePass" />
<input type="submit" />
</form>
</body>
<script>
document.getElementById("exampleForm").onsubmit =function() {
var passwordRegex =/^[-+]?\d*(\.\d+)?$/;
if(!passwordRegex.test(document.getElementById("examplePass").value)) {
console.log("Regex didn't match");
var notify = document.getElementById("notify");
if(notify===null) {
notify =document.createElement("p");
notify.textContent = "輸入的字串為整數或小數"
notify.id = "notify";
var body = document.getElementById("body");
body.appendChild(notify);
}
}
};
</script>
</html>
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