简单教程
提交运行
代码编辑器:
<form id="myForm"> <input type="number" id="myNumber" value="2"> </form> <p>点击按钮返回 number 字段所属的表单id</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myNumber").form.id; document.getElementById("demo").innerHTML = x; } </script>
运行结果: