最近学习flutter，

按照大地老师的代码，应该是没有问题，但是却提示出错，请教一下，这个代码错在哪里呢？

谢谢

import 'dart:convert';
import 'dart:html';
import 'package:flutter/material.dart';
import 'package:chinamedicine2/main.dart';
import 'package:flutter/rendering.dart';
import 'tabs.dart';
import 'homePage.dart';
import '../res/Cold.dart';
import '../res/datasource10.dart';

class sort_page2 extends StatelessWidget {
const sort_page2({Key? key}) : super(key: key);

@override
Widget build(BuildContext context) {
return sort_pageview();
}
}

class sort_pageview extends StatelessWidget {
@override
Widget build(BuildContext context) {
return ListView(
children: listData.map((value) {
print(listData[value]["illsort"]);
return Card(
margin: const EdgeInsets.all(10),
child: Column(
children: <Widget>[
ListTile(
//leading: CircleAvatar(backgroundImage: Image.asset(stock1.jpg)),
title: Text('疾病名称：' + listData[value]["illsort"]),
subtitle: Text('疾病细分类别：' + listData[value]["illsortdetails"]),
),
ListTile(
title: Text('药名：' + listData[value]["title"]),
subtitle: Text('组成：' + listData[value]["material"]),
),
ListTile(
title: Text('类型：' + listData[value]["model"]),
subtitle: Text('功能：' + listData[value]["function"]),
),
ListTile(
title: Text('用量：' + listData[value]["qty"]),
subtitle: Text('注意：' + listData[value]["attention"]),
),
ListTile(
title: Text('规格：' + listData[value]["spec"]),
subtitle: Text('保存：' + listData[value]["store"]),
),
],
),
);
}).toList(),
);
}
}

===================================

回答

获取IdentityMap对应的值的时候，传的有int，格式不符，错误不是写在上面了吗？查一下这个参数的获取