cmd輸入：
netstat -ano | findstr :3000//查看是誰占用了3000號端口 顯示如下 TCP 0.0.0.0:3000 0.0.0.0:0 LISTENING 18412 TCP [::]:3000 [::]:0 LISTENING 18412 接着輸入：
taskkill -PID 18412 -F//結束端口號 解決！
Port 3000 is already in use
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