Plotly:如何为每个子图添加下拉菜单？

import plotly.graph_objects as go
from plotly.subplots import make_subplots

# 创建一个包含2x2个子图的图表对象
fig = make_subplots(rows=2, cols=2)

# 添加子图数据和布局
fig.add_trace(go.Scatter(x=[1, 2, 3], y=[4, 5, 6], name='子图1'), row=1, col=1)
fig.add_trace(go.Scatter(x=[4, 5, 6], y=[7, 8, 9], name='子图2'), row=1, col=2)
fig.add_trace(go.Scatter(x=[7, 8, 9], y=[10, 11, 12], name='子图3'), row=2, col=1)
fig.add_trace(go.Scatter(x=[10, 11, 12], y=[13, 14, 15], name='子图4'), row=2, col=2)

# 设置下拉菜单的选项和行为
fig.update_layout(
    updatemenus=[
        dict(
            buttons=[
                dict(label='子图1',
                     method='update',
                     args=[{'visible': [True, False, False, False]}, {'title': '子图1'}]),
                dict(label='子图2',
                     method='update',
                     args=[{'visible': [False, True, False, False]}, {'title': '子图2'}]),
                dict(label='子图3',
                     method='update',
                     args=[{'visible': [False, False, True, False]}, {'title': '子图3'}]),
                dict(label='子图4',
                     method='update',
                     args=[{'visible': [False, False, False, True]}, {'title': '子图4'}])
            ],
            direction='down',
            showactive=True,
            x=0.1,
            xanchor='left',
            y=1.2,
            yanchor='top'
        ),
    ]
)

# 显示图表
fig.show()