在angular.json中配置serverTarget和servePath。

修改angular.json文件中的“server”选项，使其指向正确的ts文件。假设我们的server.ts文件位于根目录下的“server”文件夹中，那么server选项应指向“server/server.ts”：

...
"server": {
    "builder": "@angular-devkit/build-angular:server",
    "options": {
        "outputPath": "dist/example-server",
        "main": "server/server.ts",
        "tsConfig": "server/tsconfig.server.json"
    }
},
...

然后，还需要在“build”选项中添加“serverTarget”和“servePath”。假设我们的应用程序名称为“example”，且应用程序在根目录的“src”文件夹中，则可以如下修改：

...
"build": {
    "builder": "@angular-devkit/build-angular:browser",
    "options": {
        "outputPath": "dist/example",
        "index": "src/index.html",
        "main": "src/main.ts",
        "tsConfig": "src/tsconfig.app.json",
        "assets": [
            "src/favicon.ico",
            "src/assets"
        ],
        "styles": [
            "src/styles.scss"
        ],
        "scripts": []
    },
    "configurations": {
        "production": {
            "fileReplacements": [
                {
                    "replace": "src/environments/environment.ts",
                    "with": "src/environments/environment.prod.ts"
                }
            ]
        }
    },
    "serverTarget": "example:server",
    "servePath": "/"
},
...

这样设置之后，就可以运行“npm run build:ssr”和“npm run serve:ssr”，并且Angular Universal就可以在所有页面中正常工作了。