Javascript &引用；react native lanscan“；抛出异常！undefined不是对象（正在计算此.RNLAN\u Scan.Scan'；）？

要在我的react本机移动应用程序中执行icmp广播，我使用react本机lanscan软件包

import { LANScan } from 'react-native-lanscan';
.
.
var lanscan = new LANScan();
.
.
pingBroadcaster = () => {
    console.log("Lanscan started!");         // to get log
    lanscan.scan(48500, 48503, 500, true);
    lanscan.on('host_found', (host, currentAvailableHosts) => {
        console.log(typeof(host));           // to get log
    })
    console.log("Lanscan ended!");           // to get log
}

在arow函数中调用scan方法时，会导致异常：“undefined不是对象（计算'this.RNLAN\u scan.scan'）”

将一些行添加到lanscan包的扫描方法中，以找出哪一行导致错误：

    function scan(min_port,max_port){
        console.log("   Function scan variable declaration");  // to get log
        var broadcast_timeout=arguments.length>2&&arguments[2]!==undefined?arguments[2]:500;
        var fallback=arguments.length>3&&arguments[3]!==undefined?arguments[3]:true;
        var ping_ms=arguments.length>4&&arguments[4]!==undefined?arguments[4]:50;
        var port_ms=arguments.length>5&&arguments[5]!==undefined?arguments[5]:500;
        console.log("   Function call: " + RNLAN_Scan);        // to get log
        this.RNLAN_Scan.scan(min_port,max_port,broadcast_timeout,fallback,ping_ms,port_ms);
        console.log("   Function scan Ends!");                 // to get log        
    }return scan;}()},

我收到了以下日志：

Lanscan started!
   Function scan variable declaration
   Function call: null
::ffff:192.168.43.1 - - [26/Feb/2020:14:23:16 +0000] "POST /symbolicate HTTP/1.1" 200 - "-" "okhttp/3.12.1"
Lanscan started!
   Function scan variable declaration
   Function call: null
::ffff:192.168.43.1 - - [26/Feb/2020:14:23:21 +0000] "POST /symbolicate HTTP/1.1" 200 - "-" "okhttp/3.12.1"
Lanscan started!
   Function scan variable declaration
   Function call: null
::ffff:192.168.43.1 - - [26/Feb/2020:14:23:26 +0000] "POST /symbolicate HTTP/1.1" 200 - "-" "okhttp/3.12.1"
Lanscan started!

似乎RNLAN\u Scan返回null 我不确定，但这条线可能出了问题：

var RNLAN_Scan=_reactNative.NativeModules.RNLANScan;