html运行实例（jsck_doc_forms

代码示例：（标识：jsck_doc_forms_1）

<!DOCTYPE html>
<html>
<body>

<h1>Document 对象</h1>

<h2>forms 属性</h2>

<form>
<p>名字：<input type="text" name="fname" value="Gates"></p>
<p>姓氏：<input type="text" name="lname" value="Bill"></p>
</form>

<p>文档中表单元素的数量是：</p>
<p id="demo"></p>

<script>
let num = document.forms.length;
document.getElementById("demo").innerHTML = num;
</script>

</body>
</html>