【前端进阶-性能-性能优化检查点】
前端主要性能优化点
Accept-Encoding:gzip 进行资源压缩
gzip压缩方式浏览器支持情况：
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Netscape 6+ (Netscape 4-5 does, but with some bugs).
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Internet Explorer 5.5+ (July 2000) and IE 4 if set to HTTP/1.1.
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Opera 5+ (June 2000)
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Lynx 2.6+ (some time before 1999)
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Firefox 0.9.5+ (October 2001)
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Chrome since forever
-
Safari since forever (as far as I can tell)
缺点：后台服务器压缩时占用CPU资源。
减少HTTP请求数
略
减少DNS查询
略
