Flutter Isolate 基本使用 ``` //创建ReceivePort var receiver = Rec

//创建ReceivePort
var receiver = ReceivePort();
//rootIsolateToken 主要是为了在非主Isolate中调用Channel
RootIsolateToken rootIsolateToken = RootIsolateToken.instance!;
await Isolate.spawn(doTask, [receiver.sendPort,rootIsolateToken]); 

//监听从子Isolate中发送过来的数据
receiver.listen((message){
 
});

void doTask(List params) async{
 //params 就是 spawn方法的第二个参数
 var sendPort = params[0];
 var token = params[1];

 /// 注册 root isolaote 保证在子Isolate中可以调用Channel
 BackgroundIsolateBinaryMessenger.ensureInitialized(token);
 //发送消息到主Isolate
 sendPort.send(message)
}