[LayaNative 2.0]【已解决】调用安卓方法时会报找不到‘createClass’

求教，请大佬解答，万分感谢
代码写法：
var bridge = Laya.PlatformClass.createClass("demo.JSBridge");//创建脚步代理
alert(bridge.call("ShowToast:","hello"));
 
报错信息：
2020-01-04 18:20:03.353 17840-17920/com.dg.moto E/LayaBox: ==JSERROR:
    http://stand.alone.version/js/bundle.js:8263:
    TypeError: Cannot read property 'createClass' of undefined
            var bridge = Laya.PlatformClass.createClass("demo.JSBridge");
                                            ^^                            
    TypeError: Cannot read property 'createClass' of undefined
 
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改成下面这样就好了
var bridge  = window["PlatformClass"].createClass("demo.JSBridge");//创建脚步代理
alert(bridge.call("ShowToast:","hello"));