Method then

quickjs/src/main/java/com/fongmi/quickjs/utils/Async.java:56–64

(JSObject promise)

    }

    private void then(JSObject promise) {
        JSFunction then = promise.getJSFunction("then");
        if (then == null) {
            future.complete(promise);
        } else {
            consume(then, success);
            consume(promise.getJSFunction("catch"), error);
        }
    }

    private void consume(JSFunction func, JSCallFunction callback) {
        if (func == null) return;