<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<input type="text" id="txt" placeholder="請輸入一個數">
<br/>
<input type="button" value="判斷" id="save">
<script>
document.getElementById('save').onclick=function(){
var a = document.getElementById('txt').value;
if(a%2==0){
alert("是偶數");
}else{
alert('是奇數');
}
}
</script>
</body>
</html>
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