vue报错：vue.js:634 [Vue warn]: Cannot find element: #app

编译代码很简单

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="vue.js"></script><!--<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>--><!--<script src="http://static.runoob.com/assets/vue/1.0.11/vue.min.js"></script>--><script>new Vue({el:'#app',data: {message:'Hello World!'}});</script>
</head>
<body>
<div id="app"><h2>{{message}}</h2>

</div>

</body>
</html>

一直以为是引入的vue.js有问题换了好多，然后又配置npm

原来是手写的vue.js要在最后引入

因为要先有id为vue-app的div,vue才能获取相应的元素。

更改后：

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><script src="vue.js"></script><!--<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>--><!--<script src="http://static.runoob.com/assets/vue/1.0.11/vue.min.js"></script>-->

</head>
<body>
<div id=“app”>
<h2>{{message}}</h2>

</div>

</body>
</html>

vue.js在官网下载即可：https://cn.vuejs.org/v2/guide/installation.html

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vue报错：vue.js:634 [Vue warn]: Cannot find element: #app

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