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                # 正確設置PORT端口(windows/mac) 在跑lesson5的時候,有部分同學會遇到以下錯誤,這是由于不同系統,所執行的命令代碼有所差異。 ![](https://box.kancloud.cn/e369b4a15e12fb1824ece0760226e9cf_438x407.png) ## MAC/linux環境: ``` $ PORT=8081 npm start ``` 使用上面命令每次都需要重新設置 如果想設置一次永久生效,使用下面的命令。 ``` $ export PORT=8081 ``` ``` $ npm start ``` ## Window系統環境,按照順序這樣進行: ``` set PORT=8081 ``` ``` npm start ``` 關閉命令行窗口后,端口的配置會失效
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