我正在构建一个可以执行DNS查询的Cordova插件。由于操作是异步的,因此我需要使用回调来返回值。我有#import....-(void)dnsQuery:(CDVInvokedUrlCommand*)command{iddomain=[command.argumentsobjectAtIndex:0];DNSServiceRefserviceRef;DNSServiceQueryRecord(&serviceRef,0,0,"hmspl.de",kDNSServiceType_TXT,kDNSServiceClass_IN,queryCallback,command);DNSSer