old_contents: // The Vue build version to load with the `import` command
  // (runtime-only or standalone) has been set in webpack.base.conf with an alias.
  import Vue from 'vue'
  import App from './App'
  import router from './router'
  import store from './store'
  
  Vue.config.productionTip = false
  
  /* eslint-disable no-new */
  new Vue({
    el: '#app',
    router,
    store,
    template: '<App/>',
    components: { App }
  })
  
  //if ('serviceWorker' in navigator) {
  //    navigator.serviceWorker
  //  	           .register('./service-worker.js')
  //  	           .then(function() { console.log('Service Worker Registered'); });
  //  	}
  
new_contents: // The Vue build version to load with the `import` command
  // (runtime-only or standalone) has been set in webpack.base.conf with an alias.
  import Vue from 'vue'
  import App from './App'
  import router from './router'
  import store from './store'
  
  Vue.config.productionTip = false
  
  /* eslint-disable no-new */
  new Vue({
    el: '#app',
    router,
    store,
    template: '<App/>',
    components: { App }
  })
  
  if ('serviceWorker' in navigator) {
      navigator.serviceWorker
    	           .register('./service-worker.js')
    	           .then(function() { console.log('Service Worker Registered'); });
    	}
  
subject: test service worker