首先，我对Java语言还很陌生，如果这是一个简单的问题，我们深感抱歉。我的目标是在标记中显示switch语句的结果。目前，我只是尝试对其进行console.log，但似乎无法正常工作。我的困难似乎是将下拉列表中的值存储在可以在switch语句中使用的变量中。这是我尝试过的：
var behaviour = document.getElementById("behaviour");
var kentsBehaviour = behaviour.value;
console.log(kentsBehaviour)
//var h3 = document.getElementsByTagName("h3");
function kentsReward (kentsBehaviour) {
var prize;
switch (kentsBehaviour) {
case "Really good":
prize = "You get foot rubs!";
break;
case "Good":
prize = "You get an Oreo";
break;
case "Medium":
prize = "You get bread";
break;
case "Not so good":
prize = "You don't get anything";
break;
case "Greer":
prize = "You get pinches";
break;
default:
return "Tell me how you behaved today";
}
console.log( prize);
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Kent's Rewards</title>
</head>
<body>
<h1>Please select your behaviour for today:</h1>
<select name="behaviour" id="behaviour" onChange="kentsReward()">
<option value="default">Select your behaviour</option>
<option value="Really good">Really good</option>
<option value="Good">Good</option>
<option value="Medium">Medium</option>
<option value="Not so good">Not so good</option>
<option value="Bad">Bad</option>
<option value="Greer">Greer</option>
</select>
<h2>Your reward is:</h2>
<h3></h3>
<script type="text/javascript" src="script.js"></script>
</body>
</html>由于您定义了带有参数的kentsReward(*parameter*)。在选择标记处调用时，您不会传递任何内容。尝试传递选择字段的当前值，例如<select name="behaviour" id="behaviour" onChange="kentsReward(this.value)">