javascript openlayers3对象方法

Question

I have this piece of code :

let text = new ol.style.Text({
    font: '14px Arial',
    text: 'string'
});

let icon = new ol.style.Style({
    image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
        anchor: [0.5, 46],
        anchorXUnits: 'fraction',
        anchorYUnits: 'pixels',
        src: './img/icon.png'
    })),
    text: text
});

why is this working ? :

text.setText("otherString"); 
icon.setText(text); 
feature.setStyle(icon) 

// the name of someFeature is changed to someOtherString as supposed to 

but this is not working :

feature.setStyle(icon.setText(text.setText("anotherString"))); 
//name is not changed.

This is probably something about Javascript that I don't understand. Please help! Thanks!

Answer 1

Probably because someText.setText() return type is not what is expected to be input type of someIcon.setText() .

If you try to do like: someIcon.setText(someText);

You are passing a object someText and not the output of someText.setText("someOtherString") .

That is the reason why someIcon.setText(someText); is working but someIcon.setText(someText.setText("someOtherString")) is not working.