[LayaNative 2.0]大佬们帮忙看一下这个问题 ReferenceError: Laya3D is not defined

    ReferenceError: Laya3D is not defined
            Laya3D.init(720, 1280, true);
            ^^                            
    ReferenceError: Laya3D is not defined
        at new Main (http://stand.alone.version/js/bundle.js:4930:10)
        at http://stand.alone.version/js/bundle.js:5029:2
        at http://stand.alone.version/js/bundle.js:5031:2
        at Document._downloadOk (apploader.js:6449:20)
        at apploader.js:6428:20
        at FileReader.filereader.onload (apploader.js:6970:47)