如何将滚动设置为文本的某一部分可见JavaFX

ScrollPane scrollPane = new ScrollPane();
scrollPane.setPrefSize(width, height);

Text text = new Text("这里是文本内容");
scrollPane.setContent(text);

scrollPane.setVbarPolicy(ScrollPane.ScrollBarPolicy.ALWAYS); // 始终显示垂直滚动条
scrollPane.setHbarPolicy(ScrollPane.ScrollBarPolicy.NEVER); // 不显示水平滚动条

scrollPane.setFitToWidth(true); // 自动调整文本宽度
scrollPane.setFitToHeight(true); // 自动调整文本高度

Pane root = new Pane();
root.getChildren().add(scrollPane);

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.layout.Pane;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class ScrollableTextExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        int width = 400;
        int height = 300;

        ScrollPane scrollPane = new ScrollPane();
        scrollPane.setPrefSize(width, height);

        Text text = new Text("这里是文本内容");
        scrollPane.setContent(text);

        scrollPane.setVbarPolicy(ScrollPane.ScrollBarPolicy.ALWAYS);
        scrollPane.setHbarPolicy(ScrollPane.ScrollBarPolicy.NEVER);

        scrollPane.setFitToWidth(true);
        scrollPane.setFitToHeight(true);

        Pane root = new Pane();
        root.getChildren().add(scrollPane);

        Scene scene = new Scene(root, width, height);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}