isURLSameOrigin.js:57 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'protocol')

报错信息"Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'protocol')"出现在isURLSameOrigin.js文件的第57行。该错误通常是由于无法读取未定义对象的属性引起的。

这个错误通常在使用axios库时出现，原因是在main.js文件中错误地引用了axios。正确的写法是将axios赋值给Vue实例的原型属性。即使用Vue.prototype.axios = axios;。而不是使用Vue.use(axios);

更具体地说，这个错误可能是由于在使用axios发送请求之前没有正确配置axios实例所致。在配置axios实例时，应该使用Vue.prototype.axios = axios;来将axios赋值给Vue的原型属性，以便在组件中使用axios进行请求。

总结一下，问题的原因是在使用axios时出现了错误的引用方式，正确的写法是将axios赋值给Vue的原型属性。这样可以避免出现"Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'protocol')"的错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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