<form id="myForm">

拾色器: <input type="color" id="myColor">

</form>

<p>点击 "点我" 按钮返回拾色器是属于哪个表单</p>

<p id="demo"></p>

<button onclick="myFunction()">点我</button>

<script>

function myFunction() {

    var x = document.getElementById("myColor").form.id;

    document.getElementById("demo").innerHTML = x;

}

</script>

​