<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
<script type="text/javascript">
    Vue.config.productionTip= false;

    let person = {
        name:'张三',
        sex: '男',
    };

    Object.defineProperty(person,'age',{
        value:18
    });
    console.log(person);
</script>
</body>
</html>