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同源策略

协议 域名 端口 同域

http://www.zf.cn:8081 https://a.zf.cn:8081

为什么浏览器不支持跨域

cookie LocalStorage
DOM元素也有同源策略 iframe ajax 也不支持跨域

实现跨域

  • jsonp
  • cors
  • postMessage
  • window.name
  • location.hash
  • http-proxy
  • nginx
  • websocket
  • document.domain

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跨域详解

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