import streamlit as st

x = st.slider('Select a value')
st.write(x, 'squared is', x * x)

# 添加一个按钮
if st.button("全屏"):
    # 使用 JavaScript 实现全屏功能
    st.markdown(
        """
        <script>
        function toggleFullScreen() {
            if (!document.fullscreenElement &&    // alternative standard method
                !document.mozFullScreenElement && !document.webkitFullscreenElement && !document.msFullscreenElement ) {
                if (document.documentElement.requestFullscreen) {
                    document.documentElement.requestFullscreen();
                } else if (document.documentElement.msRequestFullscreen) {
                    document.documentElement.msRequestFullscreen();
                } else if (document.documentElement.mozRequestFullScreen) {
                    document.documentElement.mozRequestFullScreen();
                } else if (document.documentElement.webkitRequestFullscreen) {
                    document.documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
                }
            } else {
                if (document.exitFullscreen) {
                    document.exitFullscreen();
                } else if (document.msExitFullscreen) {
                    document.msExitFullscreen();
                } else if (document.mozCancelFullScreen) {
                    document.mozCancelFullScreen();
                } else if (document.webkitExitFullscreen) {
                    document.webkitExitFullscreen();
                }
            }
        }
        toggleFullScreen();
        </script>
        """,
        unsafe_allow_html=True
    )
def click():
    print('hello world')
    st.write("按钮被点击了！")
    return 1
# 创建一个按钮，并直接指定点击时调用的函数
st.button("点击我", on_click=click)