说说同源策略和跨域
同源策略是什么?
http://www.baidu.com/s
http://www.baidu.com:80/ssdasdsadad同源策略怎么做?
优点
缺点
怎么解决缺点
Access-Control-Allow-Origin: https://甲站点 Access-Control-Allow-Methods: POST, GET, OPTIONS, PATCH Access-Control-Allow-Headers: Content-Type
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