Vue is not defined 、

这个错误通常发生在使用 Vue.js 框架的时候，没有正确引入 Vue.js 库。需要确认下面几点：

1. 确认 Vue.js 是否被正确引入，并且在使用前已经加载完成。
2. 确认 Vue.js 的版本是否与当前代码兼容。
3. 确认 Vue.js 是否被正确安装，可以尝试重新安装 Vue.js。

如果以上方法都无法解决问题，可以尝试检查代码中是否有其他可能与 Vue.js 冲突的库。

相关问题

Vue is not defined

这是一个常见的错误提示，意思是Vue未定义。通常出现这个错误是因为在使用Vue之前没有正确引入Vue的相关文件或者是Vue的引入位置不正确。要解决这个问题，请首先检查你的Vue相关文件是否正确引入，确保Vue.js已经正确下载并被引入。或者你可以尝试在文件中加入以下代码：import Vue from 'vue'。这样可以确保正确引入Vue，并且可以解决这个问题。

vue is not defined

The error "vue is not defined" typically occurs when you are trying to use Vue.js without properly including it in your project. To resolve this issue, make sure you have included the Vue.js library in your HTML file by adding the following script tag:

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

Alternatively, you can use a local copy of the Vue.js library by downloading it from the official website (https://vuejs.org) and including it in your project folder.

Once you have included the Vue.js library, ensure that you are referencing it correctly in your JavaScript code. You can do this by checking if the variable "Vue" is defined before using it. For example:

if (typeof Vue !== 'undefined') {
  // Your Vue.js code here
} else {
  console.error("Vue.js is not defined");
}

By following these steps, you should be able to resolve the "vue is not defined" error and use Vue.js in your project successfully.