index.html


<!DOCTYPE html>
<html lang="">
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title></title>
      
    </head>
    <body>
        <div id="app">
            {{msg.value}}
        </div>
        <script src="dist/vue.js"></script>
        <script>
            // umd Vue
            // console.log(Vue)
            // 响应式 object.defaultProperty
         let vm=   new Vue({
                el:'#app', //编译模版编译到的位置
                data(){ //初始化数据
                        return {
                            msg:{
                                value:'2'
                            },
                            a:'hello',
                            list:[1,23,6,5],
                            arr:[{a:1},2]
                        }

                },
                props:{},
                watch:{}
            })
        
        console.log('%cindex.html line:34 vm._data', 'color: #007acc;', vm._data);
        </script>
     </body>
</html>