用js语言写一个能把学号填入空格单击按钮后输出红色字体的学号的代码
<!DOCTYPE html>
<html>
<head>
<title>填学号</title>
<script>
function fillStudentNo() {
var studentNo = document.getElementById("studentNo").value;
document.getElementById("output").innerHTML = "<span style='color:red'>" + studentNo + "</span>";
}
</script>
</head>
<body>
<label for="studentNo">请输入学号：</label>
<input type="text" id="studentNo">
<button onclick="fillStudentNo()">填入学号</button>
<div id="output"></div>
</body>
</html>
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