<script>
var Product = kendo.data.Model.define({
    id: "productId",
    fields: {
        productId: { type: "number" },
        name: { type: "string" }
    }
});
var product = new Product({ productId: 1, name: "Sample Product" });

/* The result can be observed in the DevTools(F12) console of the browser. */
console.log(product.idField); // outputs "productId"
</script>

<script>
var Person = kendo.data.Model.define({
    id: "personId",
    fields: {
        "name": {
            type: "string"
        },
        "age": {
            type: "number"
        }
    }
});

var person = new Person({
    personId: 1,
    name: "John Doe",
    age: 42
});

/* The result can be observed in the DevTools(F12) console of the browser. */
console.log(person.id); // outputs 1
/* The result can be observed in the DevTools(F12) console of the browser. */
console.log(person.idField); // outputs "personId"
</script>