如何在Python的Dash包中创建两个按钮，这两个按钮可以以各自的方式修改两个cardbody？

import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output

app = dash.Dash(__name__)

app.layout = html.Div([
    html.Button('按钮1', id='button-1'),
    html.Button('按钮2', id='button-2'),
    html.Div(id='cardbody-1'),
    html.Div(id='cardbody-2')
])

@app.callback(
    Output('cardbody-1', 'children'),
    [Input('button-1', 'n_clicks')]
)
def update_cardbody_1(n_clicks):
    if n_clicks is None:
        return '初始内容'
    else:
        return '按钮1被点击了 {} 次'.format(n_clicks)

@app.callback(
    Output('cardbody-2', 'children'),
    [Input('button-2', 'n_clicks')]
)
def update_cardbody_2(n_clicks):
    if n_clicks is None:
        return '初始内容'
    else:
        return '按钮2被点击了 {} 次'.format(n_clicks)

if __name__ == '__main__':
    app.run_server(debug=True)