Vue只显示{{变量名}}，不显示变量值

        刚开始学习Vue，上来先写个hello world。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="app">
        <h1>
            hello world!
            {{name}}
        </h1>
    </div>

<script src="node_modules/vue/dist/vue.js"></script>
<script>
    const app = new Vue({
        el: "#app",
        data: {
            name: "社会你虎哥！"
        }
    });

</script>
</body>
</html>

下面这样写是不对的

<!--错误1-->
<script src="node_modules/vue/dist/vue.js"/>
<script>
    const app = new Vue({
        el: "#app",
        data: {
            name: "社会你虎哥！"
        }
    });

</script>
<!--错误2-->
<script src="node_modules/vue/dist/vue.js">
   const app = new Vue({
        el: "#app",
        data: {
            name: "社会你虎哥！"
        }
    });
</script>
<script>
</script>

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