代码示例：（标识：jsck_state_if_prompt）
<!DOCTYPE html>
<html>
<body>
<p>我在想一个字母。猜猜是哪个：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;
// 如果字母是 "c"
if (letter === "c") {
text = "Spot on! Good job!";
// 如果字母是 "b" 或 "d"
} else if (letter === "b" || letter === "d") {
text = "Close, but not close enough.";
// 如果是其他字母
} else {
text = "Waaay off..";
}
document.getElementById("demo").innerHTML = text;
}
</script>
</body>
</html>
