<!DOCTYPE html>
<html>
<body>
复选框：<input type="checkbox" id="myCheck">
<p>单击“试一试”按钮可禁用复选框。</p>
<button onclick="myFunction()">试一试</button>
<script>
function myFunction() {
document.getElementById("myCheck").disabled = true;
}
</script>
</body>
</html>