1.简述
1.1协议端口主机不同就是跨域
1.2跨域时报错
Failed to load https://bb.bb.bb/data.php?aaaa=1111: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://aa.aa.aa' is therefore not allowed access.Failed t
阅读背景：
HTTP跨域方法_思维小刀_http跨域
来源：互联网
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