cmd输入：
netstat -ano | findstr :3000//查看是谁占用了3000号端口 显示如下 TCP 0.0.0.0:3000 0.0.0.0:0 LISTENING 18412 TCP [::]:3000 [::]:0 LISTENING 18412 接着输入：
taskkill -PID 18412 -F//结束端口号 解决！
Port 3000 is already in use
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