代码示例：（标识：jsck_doc_forms_5）
<!DOCTYPE html>
<html>
<body>
<h1>Document 对象</h1>
<h2>forms 属性</h2>
<p><form id="myCarForm">
喜欢的车：<input type="text" name="fname" value="Volvo">
</form></p>
<p><form id="myColorForm">
喜欢的颜色：<input type="text" name="favcolor" value="Blue">
</form></p>
<p>文档中表单元素的名称是：</p>
<p id="demo"></p>
<script>
const forms = document.forms;
let text = "";
for (let i = 0; i < forms.length; i++) {
text += forms[i].id + "<br>";
}
document.getElementById("demo").innerHTML = text;
</script>
</body>
</html>
