How does the js in Mini Program's custom component control the setData of the current page?

I have defined a custom component, and the internal call server api calls back some data. I expect to get the callback data to api after loading the component, or directly affect the data in the object of the year!

related codes

my-component.js
Component({
    methods:{
        _innerHandler()
        {
            //do something and set data;
            //index.js  data
           object.setData({
               // ...
           })
           
        }
    }
});

index.js
page({
    data : {
        
    }
})
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