<!DOCTYPE html>
<html>
<body>
<p>我在考虑一字母。 猜猜哪个：a、b、c、d 或 e？</p>
<input id="myInput" type="text">
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() { var letter = document.getElementById("myInput").value; var text;
if (letter === "c") { text = "Spot on! Good job!";
} else if (letter === "b" || letter === "d") { text = "Close, but not close enough.";
} else { text = "Waaay off..";
}
document.getElementById("demo").innerHTML = text;}
</script>
</body>
</html>