Select2 如何设置值?

I know if i have a select2 and i want to set one of the options, i can do run this code.

 $(document).ready(function(){
     $('#btn').change(function(){
       $('#select').val(4).trigger("change")
     });    
 });

Lets say i want to get the text of the option

<option value=4>California</option>

but if i want to set it based on the text not the value, how do i do it?

I tried doing

$("#select").select2(data.text(), "California");

but it didnt work.

How can i do this programatically in jquery or javascript.

Any help is appreciated