关于flutter:Dart-List-用法小结

一、map联合..操作符更改数组中的某一个字段，其余字段不变

void main() {  List<PersonModel> list =[    PersonModel(name:'kobe1',age:20,sex:1),    PersonModel(name:'kobe2',age:30,sex:2),    PersonModel(name:'kobe3',age:40,sex:1),  ];// map 操作会扭转原来的List  list.map((e)=>e..name = 'new name').toList();    for(var item in list){    print(item.toJson());  }// 打印输出// {name: new name, age: 20, sex: 1}// {name: new name, age: 30, sex: 2}// {name: new name, age: 40, sex: 1}}class PersonModel {  String name;  int age;  int sex;  PersonModel({this.name, this.age, this.sex});  PersonModel.fromJson(Map<String, dynamic> json) {    name = json['name'];    age = json['age'];    sex = json['sex'];  }  Map<String, dynamic> toJson() {    final Map<String, dynamic> data = new Map<String, dynamic>();    data['name'] = this.name;    data['age'] = this.age;    data['sex'] = this.sex;    return data;  }}