bug
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XMLHttpRequest cannot load http://localhost:19200/socket.io/?EIO=3&transport=polling&t=LpASkye. The value of the \'Access-Control-Allow-Origin\' header in the response must not be the wildcard \'*\' when the request\'s credentials mode is \'include\'. Origin \'http://localhost:19000\' is therefore not allowed access. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.
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decorators中不能用箭头函数
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