Vue报错：Vue ERROR TypeError: Cannot read property “upgrade” of undefined - 码上快乐

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Vue报错：Vue ERROR TypeError: Cannot read property “upgrade” of undefined

本文转载自查看原文 2020-10-09 10:36 565

问题：执行Vue项目时报错Vue ERROR TypeError: Cannot read property ‘upgrade’ of undefined？

描述：给vue项目增加了本地代理，也就是给vue.config.js增加了devServer之后，启动项目报错：Vue ERROR TypeError: Cannot read property ‘upgrade’ of undefined

解决：这个错误实际上时因为代理地址为空导致的，检查后发现proxy属性中的target的值为空，没有填入，填入后解决错误！

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