在flutter中更改文本字段中某些单词的颜色(不是全部；某些)

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: RichText(
            text: TextSpan(
              text: 'Hello World',
              style: DefaultTextStyle.of(context).style,
              children: <TextSpan>[
                TextSpan(
                  text: 'Hello',
                  style: TextStyle(color: Colors.red),
                ),
                TextSpan(text: ' World'),
              ],
            ),
          ),
        ),
      ),
    );
  }
}