vue asyncComponent 異步加載路由參數(shù)delay等無(wú)效?

代碼如下，我想對(duì)路由進(jìn)行懶加載，但是能夠進(jìn)行正在加載中的提示，按照官網(wǎng)提示，但是delay沒(méi)有效果
路由加載：
{

    path: '/Me',
    name: 'Me',
    //component: r => import("@/views/loading/loadable")
    component:  asyncComponent()
}

asyncComponent函數(shù)：
import LoadingComponent from '@/views/loading/index.vue'
import errorCom from '@/views/loading/error'
export default (asyncComponent) => {

const Com= function(){
    let a = {
        component: require('@/views/Me'),
        loading: LoadingComponent,
        error: errorCom,
        delay: 2000
    }
    return a
}
return {
    render: function (h) {
        return h(Com, {})
    }
}

}