为什么以下代码无法显示降价编辑器？
为什么无法通过CDN使用VueSimpleMDE显示降价编辑器？
<html>
<head>
<script src="https://cdn.bootcss.com/vue/2.4.4/vue.min.js"></script>
<link href="https://unpkg.com/simplemde@1.11.2/dist/simplemde.min.css" rel="stylesheet">
<script src="https://unpkg.com/simplemde@1.11.2/dist/simplemde.min.js"></script>
<script src="https://unpkg.com/vue-simplemde@0.4.6/dist/vue-simplemde.min.js"></script>
</head>
<body>
<script>
Vue.use(VueSimpleMDE);
</script>
<div id="vue-app">
{{ content }}
<markdown-editor v-model="content" ref="markdownEditor"></markdown-editor>
</div>
<script>
var vue = new Vue({ "el": "#vue-app", data: { content: "kdfljads" } });
</script>
</body>
</html>