程式碼
<html>
<head>
</head>
<body id="body">
<form action="javascript:void(0);" id="exampleForm">
<input id="examplePass" type="text" />
<input type="submit" />
</form>
<script>
document.getElementById("exampleForm").onsubmit = function(){
var passwordRegex =/^((?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))*$/;
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 = "請輸入正確的網址";
notify.id ="notify";
var body =document.getElementById("exampleForm");
body.appendChild(notify);
}
}
};
</script>
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