错误信息：

D:\workspace-sts\dqgy\manage>ng serve

C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\core\src\workspace\workspace.js:59
            throw new WorkspaceNotYetLoadedException();
            ^


Error: Workspace needs to be loaded before it is used.
    at Workspace._assertLoaded (C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\core\src\workspace\workspace.js:59:19)
    at Workspace.getProjectByPath (C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\core\src\workspace\workspace.js:103:14)
    at isWarningEnabled (C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\utilities\config.js:262:35)
    at C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\lib\init.js:79:27
    at C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\resolve\lib\async.js:48:21
    at ondir (C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\resolve\lib\async.js:199:27)
    at C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\resolve\lib\async.js:166:39
    at onex (C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\resolve\lib\async.js:107:32)
    at C:\Users\dqgzs\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\resolve\lib\async.js:10:20

    at FSReqWrap.oncomplete (fs.js:153:5)

解决办法：

修改配置文件dqgy\manage\angular.json，

在

"scripts": [

"src/jquery/jquery/dist/jquery.js",
"src/jquery/bootstrap/dist/js/bootstrap.js",
"src/angular/angular/angular.js"

            ],

后边加上缺少的逗号，如下所示：

{

  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "test-ng4": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "target/classes/static",
            "index": "src/index.html",
            "main": "src/main.ts",
            "tsConfig": "src/tsconfig.app.json",
            "polyfills": "src/polyfills.ts",
            "assets": [
              "src/assets",
              "src/favicon.ico"
            ],
            "styles": [
"src/styles.css",
"src/assets/animate.css/animate.css",
"src/assets/font-awesome/css/font-awesome.min.css",
"src/assets/simple-line-icons/css/simple-line-icons.css",
"src/jquery/bootstrap/dist/css/bootstrap.css",
"src/assets/css/font.css",
                "src/assets/css/app.css",
"src/assets/css/dqgy.css"
            ],
            "scripts": [
"src/jquery/jquery/dist/jquery.js",
    "src/jquery/bootstrap/dist/js/bootstrap.js",
    "src/angular/angular/angular.js"
            ],
          },
          "configurations": {
            "production": {
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "test-ng4:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "test-ng4:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "test-ng4:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "karmaConfig": "./karma.conf.js",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "styles": [
"src/styles.css",
"src/assets/animate.css/animate.css",
"src/assets/font-awesome/css/font-awesome.min.css",
"src/assets/simple-line-icons/css/simple-line-icons.css",
"src/jquery/bootstrap/dist/css/bootstrap.css",
"src/assets/css/font.css",
                "src/assets/css/app.css",
"src/assets/css/dqgy.css"
            ],
            "scripts": [
"src/jquery/jquery/dist/jquery.js",
    "src/jquery/bootstrap/dist/js/bootstrap.js",
    "src/angular/angular/angular.js"
            ],
            "assets": [
              "src/assets",
              "src/favicon.ico"
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    },
    "test-ng4-e2e": {
      "root": "",
      "sourceRoot": "",
      "projectType": "application",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "./protractor.conf.js",
            "devServerTarget": "test-ng4:serve"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "e2e/tsconfig.e2e.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    }
  },
  "defaultProject": "test-ng4",
  "schematics": {
    "@schematics/angular:component": {
      "prefix": "app",
      "styleext": "scss"
    },
    "@schematics/angular:directive": {
      "prefix": "app"
    }
  }
}