in the study of the vuex project, I found someone else"s code from github. Can the "callback (_ products)" here be used in this way? I don"t understand this way of writing
./**
 * 
 */
var _products = [
  {"id": 1, "title": "iPad 4 Mini", "price": 500.01, "inventory": 2},
  {"id": 2, "title": "H&M T-Shirt White", "price": 10.99, "inventory": 10},
  {"id": 3, "title": "Charli XCX - Sucker CD", "price": 19.99, "inventory": 5}
]
export default {
    //
    getProducts:function(callback){
        //callback
        setTimeout(callback(_products), 300)
    },
}