jsdk-offical/examples/jsfx/sider/inner.js

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JS.imports([
    '$jsvp',
    '$jsfx'
]).then(() => {
    new TextInput({
        id: 'txt1'
    });
    new Button({
        id: 'btn1',
        text: 'Close Me'
    }).on('click', () => {
        Page.fireEvent('close', ['data from inner.html']);
    });
});