app.py

import gradio as gr

def update_iframe(url):
    return f'<iframe src="{url}" width="100%" height="500"></iframe>'

with gr.Blocks() as demo:
    with gr.Row():
        url_input = gr.Textbox(label="输入URL", value="http://animeit.cn/")
        submit_btn = gr.Button("加载")
    iframe = gr.HTML()

    submit_btn.click(
        fn=update_iframe,
        inputs=url_input,
        outputs=iframe
    )

demo.launch()