let(变量)/const(常量)var有缺陷所以在es6中用letHelloVuejs
<body><div id="app">{{message}}</div><script src="../js/vue.js"></script><script> //let(变量)/const(常量) const app = new Vue({ el: ‘#app‘, data: { message: ‘helloVuejs‘ } })</script></body>
