ccclass中定义的statics为什么无效？

Creator 2.x
#1

`var Sigleton = cc.Class({
properties: {
_Instance:null,
},

statics:{
    getInstance( subClass ){
        if( null === this._Instance ){
            this._Instance = new subClass( )//新建对象时会调用父类构造函数
        }
        return this._Instance
    }
},

ctor( object ){
    if( this._Instance !== null ){
        cc.log( "===实例化异常===" )
    }
    this.InitObj( )
},
//虚函数
InitObj( ){
    cc.log( '=========SIgleTon Init======' )
},

});

module.exports = Sigleton`

var Sigleton = require( 'Sigleton' ) console.log( 'Sigleton',Sigleton )

输出结果是

这是什么情况，即使我写成
Sigleton.getInstance = function( subClass ){ if( null === this._Instance ){ this._Instance = new subClass( )//新建对象时会调用父类构造函数 } return this._Instance }
还是没有getInstance方法

#2

找到原因了statics:{
getInstance( subClass ){
if( null === this._Instance ){
this._Instance = new subClass( )//新建对象时会调用父类构造函数
}
return this._Instance
}
},
statics:{
getInstance：function( subClass ){
if( null === this._Instance ){
this._Instance = new subClass( )//新建对象时会调用父类构造函数
}
return this._Instance
}
},