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<!DOCTYPE html> <html> <body> <h2>使用 document.forms 查找 HTML 元素</h2> <form action=""> First name: <input type="text" name="fname" value="Donald"> <input type="submit" value="提交"> </form> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = "Number of forms: " + document.forms.length; </script> </body> </html>