import { createApp } from 'vue'; import App from './App'; import router from './router'; import store from './store'; import '@/style/index.scss'; import Vant from "vant"; import "vant/lib/index.css"; import "babel-polyfill" let app = createApp(App) app.use(Vant) app.directive('opacity', { mounted(el, binding) { console.log(binding.value) // binding.value 是我们传递给指令的值——在这里是 200 //透明度 el.style.opacity = binding.value?1:0 }, updated(el,binding){ el.style.opacity = binding.value?1:0 } }) app.use(router).use(store).mount('#app');