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源代码：
点击运行
<!DOCTYPE html> <html> <body> <form action="form-action.php"> Time: <input type="time" id="myTime" name="usr_time"> <input type="submit"> </form> <p>点击 "点我" 按钮为 time 字段设置 required 属性。</p> <p><strong>提示：</strong> 在点击 "点我" 按钮前后点击 "提交" 按钮查看效果</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myTime").required = true; document.getElementById("demo").innerHTML = " required 属性已设置，time 字段在标题提交前为必填字段。"; } </script> </body> </html>
运行结果
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