Vue异步加载about组件

Vue.component('about', {template: '<div>ABOUT PAGE</div>'}); 

<div id="app">    <router-link to="/home">/home</router-link>    <router-link to="/about">/about</router-link>    <router-view></router-view>  </div>  <script src="static/js/vue.min.js"></script>  <script src="static/js/vue-router.js"></script>  <script>    function load (componentName, path) {      return new Promise(function (resolve, reject){        var script = document.createElement('script');        script.src = path;        script.async = true;        script.onload = function () {          var component = Vue.component(componentName);          if (component) {            resolve(component);          } else {            reject();          }        }        document.body.appendChild(script);      });    }    var router = new VueRouter({      routes: [{        path: '/',        redirect: '/home'      }, {        path: '/home',        component: {          template: '<div>HOME PAGE</div>'        }      },{        path: '/about',        component: function (resolve, reject) {          load('about', 'static/js/business/about.js').then(resolve, reject);        }      }]    });    var app = new Vue({      el: '#app',      router: router    });  </script>