<html>
<body>
<form action="form-action.php">
日期: <input type="datetime-local" id="myLocalDate" name="date" required>
<input type="submit">
</form>
<p>点击 "点我" 按钮查看本地时间字段在表单提交前是否为必填项。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myLocalDate").required;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>