在项目文件夹下创建proxy.config.json文件：

{
  "/api": {
    "target": "http://api-dev..com",
    "logLevel": "debug",
    "changeOrigin": true,
    "secure": false,
    "pathRewrite": {
      "^/api": ""
    }
  },
  "/api/v1": {
    "target": "http://api-dev..com/v1",
    "logLevel": "debug",
    "changeOrigin": true,
    "secure": false,
    "pathRewrite": {
      "^/api/v1": ""
    }
  },
  "/api/common/v1": {
    "target": "http://api-dev..com/api/common/v1",
    "logLevel": "debug",
    "changeOrigin": true,
    "secure": false,
    "pathRewrite": {
      "^/api/common/v1": ""
    }
  }
}

调用接口：

const url = "http://localhost:4200/api/common/v1/xxxx"
//在调用的时候请求会被代理到：http://api-dev..com/api/common/v1/xxxx
this.http.get(url)   .then(response => {
  //逻辑处理
}).catch(error=>{
 //逻辑处理
});

package.json 配置：

"start":  "ng serve --host 0.0.0.0  --proxy-config proxy.config.json ",

运行代码：

npm run start

扩展 - 环境配置

environments 文件夹下创建environment.local.ts文件：

export const environment = {
  production: false,
  BASE_COMMON_URL:"http://localhost:4200/api/common/v1",
  BASE_URL:"http://localhost:4200/api/v1",
  BASE_API:"http://localhost:4200/api",
};

angular.json配置

{
  ...//省略
  "projects": {
    "your-project-name": {
      ...//省略
      "architect": {
        "build": {
          ...//省略
          "configurations": {
            "production": {
                  ...//省略
              },
            "local": {//增加代码
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.local.ts"
                }
              ]
            }
          }
        },
        "serve": {
          ...//省略
          "configurations": {
            "production": {
              "browserTarget": "new-m2-frontend:build:production"
            },
            "local": {//增加代码
              "browserTarget": "your-product-name:build:local"
            }
          }
        },
      ...//省略
}

package.json

 "proxy":  "ng serve --host 0.0.0.0  --proxy-config proxy.config.json --configuration=local",

运行代码：

npm run proxy

这样你的修改对其他人的影响就降到最低了