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polyfill这个东西是不是为了让浏览器兼容新特性的，这个只正对es5到es6的，还是es3-es5的？
在不支持EventSource的浏览器，可以用polyfill？
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详见 polyfill 一个解决兼容的绝佳方案
https://github.com/Yaffle/EventSource
EventSource 的 polyfill