前端跨域问题及解决方案

// https://jestjs.io/ => document.domain is "jestjs.io"
// https://www.w3school.com.cn/ => document.domain is "www.w3school.com.cn"
// https://www.baidu.com/ => document.domain is "www.baidu.com"

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原文地址：https://www.cnblogs.com/hideonbush/p/9775907.html