更新时间:2023-02-12 21:58:14
document.getElementById('UserAgent').value = navigator.userAgent;
<input type="text" id="UserAgent">
$('#UserAgent').val(navigator.userAgent);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input type="text" id="UserAgent">