IOS 蓝牙搜索设备的问题

var CBCentralManager = plus.ios.importClass("CBCentralManager");  
        var manager = new CBCentralManager();  

        var delegate = plus.ios.implements("CBCentralManagerDelegate", {  
                    "centralManagerDidUpdateState:": function(State){  
                        var state = State.plusGetAttribute('state');  
                        if (state == 4) {  
                            console.log('请开启蓝牙');  
                        }  
                        console.log("2. 中央外设管理器状态 state= " + state);  
                        console.log(JSON.stringify(State));  
                    },  
                    "centralManager:didDiscoverPeripheral:advertisementData:RSSI:":function(central, peripheral, advertisementData, RSSI){  
                        console.log('4. 发现蓝牙外设 didDiscoverPeripheral')  
                        console.log('<br>central=' + JSON.stringify(central));  

                        //为什么能发现，但获取不到蓝牙设备，以下三个值均返回 undefined  
                        console.log('<br>peripheral=' + JSON.stringify(peripheral));  
                        console.log('<br>advertisementData=' + JSON.stringify(advertisementData));  
                        console.log('<br>RSSI=' + JSON.stringify(RSSI));     
                    }  
                });  
        manager.initWithDelegatequeue(delegate,null);  
        console.log('1、开始扫描蓝牙外设....');  
        manager.scanForPeripheralsWithServicesoptions(null, null);

为什么无法执行到"centralManager:didDiscoverPeripheral:advertisementData:RSSI:"这个方法里呢，请大神赐教