Error:. Port 4200 is already in use Use '--port' to specify a different port.
Since 4200 the port is already in use, use a different "--port" modify the port number.
Method 1: command
directly on the command: ng serve --port 4201
or simply: ng serve -p 4201
angular modify the port number port
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Origin www.cnblogs.com/luluping/p/11005352.html
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