webpack-serve，hot热更新不生效

在webpack-serve中，hot热更新不生效，控制台报错:webpack WebSocket connection to 'ws://0.0.0.0:8081/' failed: Connection closed before receiving a handshake response 而后查资料，解决了次问题，具体缘由得之后分析，摘录于下方：git 原文地址：https://githu

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