（Vue_Errors）Vue.js_Cannot read properties of undefined (reading ‘install‘) TypeError: Cannot read pr

左手的ㄟ右手 2024-03-16 13:48 13阅读 0赞

### problems ###

***Uncaught runtime errors:  
×  
ERROR  
Cannot read properties of undefined (reading ‘install’)  
TypeError: Cannot read properties of undefined (reading ‘install’)  
at Vue.use (webpack-internal:///./node\_modules/vue/dist/vue.runtime.esm.js:5466:27)  
at eval (webpack-internal:///./src/router.js:10:45)  
at ./src/router.js (http://localhost:8080/js/app.js:230:1)  
at webpack\_require (http://localhost:8080/js/app.js:280:33)  
at fn (http://localhost:8080/js/app.js:513:21)  
at eval (webpack-internal:///./src/main.js:4:65)  
at ./src/main.js (http://localhost:8080/js/app.js:219:1)  
at webpack\_require (http://localhost:8080/js/app.js:280:33)  
at http://localhost:8080/js/app.js:1401:109  
at webpack\_require.O (http://localhost:8080/js/app.js:326:23)***

\*![程序员编写高质量、可维护、安全且高效的代码，通常需要大量研究和经验。但也需要避免许多技术陷阱。一起来聊聊程序员有哪些绝对不能踩的坑吧！][3e9f7134bb3a46bda54048188959dc90.png]  
\*  
![在这里插入图片描述][2755092f02a2477cada493376df46333.png]

### 通过查询，是因为vue-router安装的版本过高 ###

// vue 版本和 vue-router 版本不匹配

> ![提示：根据自身理解和情况回答][454e08780c2043d0ac15fd2169e2ea86.png]  
> ![在这里插入图片描述][655fb0d2ac084ad0b34d7221bd86e5cf.png]

**vue&&vue-router版本不匹配**

### 版本vue@2.7.14而vue-router@4.2.2 ###

安装 vue-router 时，直接运行了 npm install vue-router 命令，造成直接下载最新版 vue-router @4.2.2  
**而 4 以后的版本适用于 vue@3.0 版本，用在 vue@2.x会报错。**

### 解决 ###

**在项目录下，打开`cmd`命令行,先卸载最新的vue-router；然后，再去下载vue-router@3.x版本**

npm uninstall vue-router
    
    npm install -g vue-router@3.x
    or
    npm install vue-router@3 --save

> ![在这里插入图片描述][1a52056f56fd443caff6a8eb86737616.png]  
> ![在这里插入图片描述][ae34400a9bce4b74ae09a749995ce914.png]

#### 卸载再次安装后，项目中没有查到vue-router新安装的版本怎么办？ ####

![在这里插入图片描述][79de845ece8240f0913ebe7da18f5a2f.png]

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[3e9f7134bb3a46bda54048188959dc90.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/44255a0b0d714327afd2f41895130659.png
[2755092f02a2477cada493376df46333.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/b25b9310335f4dc1be5123cfe11cd45e.png
[454e08780c2043d0ac15fd2169e2ea86.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/b725ec5120674b1ea8292d331efbb48c.png
[655fb0d2ac084ad0b34d7221bd86e5cf.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/5736142d73984be986d386d011a84c65.png
[1a52056f56fd443caff6a8eb86737616.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/3a836536e492417a9ea82b5662a327c9.png
[ae34400a9bce4b74ae09a749995ce914.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/9e8bc3e79d9747a08800d96dc7875e0e.png
[79de845ece8240f0913ebe7da18f5a2f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/16/e31ab2df927348c98797c9cd61e0567c.png