.h 文件

//定义协议
@protocol NjsAppMainEvent <NSObject>
@required
-(void) onEventInvoked:(NSString*)name;

@end
@interface NJSAppMain : NSObject{
NSString *_name;
id<NjsAppMainEvent > _delegate;
}

@property (nonatomic,retain) NSString *name;
@property (nonatomic,retain) id delegate;

-(void)setEventObserver:(id<NjsAppMainEvent >)delegate;
-(void)test;
@end

.m文件

import "NJSAppMain.h"

@implementation NJSAppMain

@synthesize name=_name,delegate=_delegate;

-(void)setEventObserver:(id<NjsAppMainEvent >)newDelegate{
NSLog(@"setEventObserver:%@",newDelegate);
_delegate = newDelegate;
}
-(void)test{
NSLog(@"setEventObserver:%@",[self delegate]);
[[self delegate] onEventInvoked:@"test"];
}

@end

.js文件
var appMainIOS = plus.ios.implements("NJSAppMain");
var appMainIOSDelete = plus.ios.implements("NjsAppMainEvent",{
"onEventInvoked":function(name){
alert("onEventInvoked:"+name);
}
});
appMainIOS.setEventObserver( appMainIOSDelete );
appMainIOS.test();

调用test方法的报错，是什么原因呢？