代碼沒錯，應(yīng)該是環(huán)境報錯
WebSocket connection to 'ws://localhost:7777/ws' failed: Error during WebSocket handshake: Unexpected response code: 200
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WebSocket connection to 'ws://localhost:7777/ws' failed: Error during WebSocket handshake: Unexpected response code: 200
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2018-11-06
response code :200 , 這是后端代碼還是提供的是http 服務(wù)，
你可能是改了代碼后，忘記停止服務(wù)重新編譯運(yùn)行了
停止原來的http服務(wù)，重新編譯、運(yùn)行就行了