Vue不是构造函数

Question

我使用webpack,在构建并运行chrome后显示此错误,我不知道如何解决它.

我的代码非常简单:

{
  "devDependencies": {
    "babel-core": "^6.23.1",
    "babel-loader": "^6.3.2",
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-preset-es2015": "^6.22.0",
    "babel-runtime": "5",
    "css-loader": "^0.26.1",
    "html-webpack-plugin": "^2.28.0",
    "vue-hot-reload-api": "^2.0.9",
    "vue-html-loader": "^1.2.3",
    "vue-loader": "10.0.3",
    "vue-style-loader": "^2.0.0",
    "vue-template-compiler": "^2.1.10",
    "webpack": "^2.2.1",
    "webpack-dev-server": "^2.4.1"
  },
  "dependencies": {
    "vue": "^2.1.10"
  }
}

Answer 1

问题是Vue最新库已经更新，所以我们需要在script标签中指定版本

请更换标签

<script src="https://cdn.jsdelivr.net/npm/vue"></script>

经过

<script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.min.js"></script>

Answer 2

我在学习Vue的时候就遇到了这个问题。我的教程来自 Vue 2，我使用的是 Vue 3。

所以我通过替换解决了这个问题

let app = new Vue({
  el: "#app",
  data: {
    message: "Hello Vue!",
  },
});

对此

const { createApp } = Vue;

createApp({
  data() {
    return {
      message: "Hello Vue!",
    };
  },
}).mount("#app");

Answer 3

Vue是该库的默认导出,因此您可以像这样导入.

import Vue from 'vue'

Answer 4

您需要导入仅运行时构建.Github问题中的这条评论解释道.

把它放在你的webpack.config.js.

resolve: {
  alias: {
    vue: 'vue/dist/vue.js'
  }
}