找到node_modules/angular-cli/lib/config/schema.json
default值就是默認的端口
"serve": { "description": "Properties to be passed to the serve command", "type": "object", "properties": { "port": { "description": "The port the application will be served on", "type": "number", "default": 4200 }, "host": { "description": "The host the application will be served on", "type": "string", "default": "localhost" } } }}也可以通過命令行方式修改，如：
ng serve --port 4201
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