Flutter中Map使用

通过字面量

  var gifts = {
    'first' : 'number',
    'second': 'turtledoves'
  };
 
  print('gifts ${ gifts }'); 
  print(gifts.runtimeType);

  var nobleGases = {
    'first' : 'number',
    'second': 'turtledoves',
      2: 'daffds'
  };
  print('nobleGases ${ nobleGases }'); // 保持原样输出
  print(nobleGases.runtimeType);

var numberStr = {
  2 : 'number',
  10 : 'turtledoves',
  12: 'dart'
};

print('numberStr ${ numberStr }'); // 保持原样输出
print(numberStr.runtimeType);

通过声明构造方法

  var instanceMap = Map();
  instanceMap['java'] = 'first';
  instanceMap['oc'] = 'oc';
  instanceMap['name'] = 'java';
  print(instanceMap);

var instanceMapNumberKey = Map();
instanceMapNumberKey[0] = 'first';
instanceMapNumberKey[1] = 'oc';
instanceMapNumberKey[2] = 'java';
print(instanceMapNumberKey);