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"
  },

第一选择:

打开的包。在“serve”部分中添加“——port port-no”。

就像下面，我已经做到了。

{
  "name": "app-name",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve --port 8090",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
}

第二个选项:如果你想通过命令提示符

运行NPM服务——端口8090

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"
  },

你应该擅长这个:

“serve”:“vue-cli-service service——port 8081”，

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",

打开package.json 添加名为serve的脚本，"serve": "Vue-cli-service serve -port 8081" NPM运行服务 服务器将运行8081

{
  "name": "app-name",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve --port 8081", 
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  }
}