最好的方法是更新包中的serve脚本命令。json文件。只需像这样追加——port 3000:

"scripts": {
  "serve": "vue-cli-service serve --port 3000",
  "build": "vue-cli-service build",
  "inspect": "vue-cli-service inspect",
  "lint": "vue-cli-service lint"
},

如果你想改变localhost端口，你可以改变package.json中的scripts标签:

 "scripts": {
    "serve": "vue-cli-service serve --port 3000",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },

将PORT环境变量添加到package.json中的服务脚本中:

"serve": "PORT=4767 vue-cli-service serve",

虽然有点晚了，但我认为将所有这些答案整合成一个概述所有选项的答案是有帮助的。

分别在Vue CLI v2 (webpack模板)和Vue CLI v3中，按优先级(从高到低)排序。

Vue CLI v3

package.json: Add port option to serve script: scripts.serve=vue-cli-service serve --port 4000 CLI Option --port to npm run serve, e.g. npm run serve -- --port 3000. Note the --, this makes passes the port option to the npm script instead of to npm itself. Since at least v3.4.1, it should be e.g. vue-cli-service serve --port 3000. Environment Variable $PORT, e.g. PORT=3000 npm run serve .env Files, more specific envs override less specific ones, e.g. PORT=3242 vue.config.js, devServer.port, e.g. devServer: { port: 9999 }

引用:

https://cli.vuejs.org/config/#devserver https://cli.vuejs.org/config/#vue-config-js https://cli.vuejs.org/guide/mode-and-env.html

Vue CLI v2(已弃用)

环境变量$PORT，例如:PORT=3000 / config / index.js: dev.port

引用:

http://vuejs-templates.github.io/webpack/ https://github.com/vuejs-templates/webpack/blob/develop/template/build/webpack.dev.conf.js#L35

Vue-cli webpack模板的端口在你的应用根目录myApp/config/index.js中。

你所要做的就是在dev块中修改端口值:

 dev: {
    proxyTable: {},
    env: require('./dev.env'),
    port: 4545,
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    cssSourceMap: false
  }

现在你可以用localhost:4545访问你的应用了

如果你有。env文件，最好从那里设置

要更改端口(NPM)，请转到package.json。在脚本中编写自己的脚本，例如:

"start": "npm run serve --port [PORT YOU WANT]"

之后你可以用npm start开始