【问题以及解决】vue和vue-router版本要对应

遇到报错

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/index.js:11:45)
    at ./src/router/index.js (http://localhost:8080/js/app.js:491:1)
    at __webpack_require__ (http://localhost:8080/js/app.js:584:33)
    at fn (http://localhost:8080/js/app.js:817:21)
    at eval (webpack-internal:///./src/main.js:4:65)
    at ./src/main.js (http://localhost:8080/js/app.js:480:1)
    at __webpack_require__ (http://localhost:8080/js/app.js:584:33)
    at http://localhost:8080/js/app.js:1705:109
    at __webpack_require__.O (http://localhost:8080/js/app.js:630:23)

检查了半天代码，好像都对，最后发现是版本不一致