小程序自定义组件lifetime中如何调用methods？

想在组件生命周期内调用methods，但是提示错误：

VM1461:1 thirdScriptError

Cannot read property ‘getBanners’ of undefined; [Component] Lifetime Method Error @ utils/components/banner/banner#attached

TypeError: Cannot read property ‘getBanners’ of undefined

下面是代码：

Component({
lifetimes: {

    attached: function () {
    this.methods.getBanners();
    },

},

pageLifetimes: {

    show: function () {
 
    },
},
properties: {
},

/**
* Component initial data
*/
data: {
},

/**
* Component methods
*/
methods: {
    getBanners: function() {
    
      console.log("getting banners");
    }

}
})