???????????????????????Timeline????????Ajax???????????????Event???е?????????μ?PurePath????????????JavaScript??????????????????XmlHttpRequest??λ???

????????PurePath???????XmlHttpRequest???

????????????????????????????δ????JavaScript???——??Details??????????????????????????XHR?????????JavaScript??й???????????????????????ò?????duration?????JavaScript??й????1127???????????????XHR???????????JavaScript?????????????????????????????????????????PurePath???ж?λ??Network Request???????????“Details”?????????Http?????????????????????????????????????????????????紫????????д????????????????????????????Details??????и??л????Details/Response Content?????????

????XmlHttpRequest??????????

?????????????????????????????372??????????????json??????????????????????????????????????????Ajax?????????PurePath????????“drill down”??onreadystatechange?????????????????????NetWork Request????????“JavaScript Execution”????onreadystatechange?????????κ?????????????????????????????readyState?4?????????????????????????????anonymous????onreadystatechange???????????????????????????????????????????·????????????????

????????XHR?????JavaScript???????

????????????????????·?Contributor??????????????????????JavaScript?????????????????????????script???????????????д????ν???????????????????????JavaScript????????Contributor???е??????????λ??PurePath???е?λ?????????????????????????????????PurePath?????????????????????λ??????????????

??????????????Script?????????DOM??

????????????????

??????????????????740??????????????????????——??????е????е?setTimeout?????????

????????????????Script???????????????head?У???????????????Script?????????????????????????“<?????>”????????[?????]?????DOM????.setAttrbute??.appendChild????????DOM?????DOM????????

????PurePath???????????????????????????????????????????????κε??????????м?????????????????????????????????????y?????????????????????????????????????????????????????????????????????????????????????????????

???????????Network??????????????——????“???”

????Network???????????????????????????е??????????????????????Cockpit????е?Network??????Summary????????URL????????“Drill Down – Network”????Network???????????????У?????Summary????????“Drill Down”????maps.google.com??Network?????

????Network?????????????????????????????????

?????????????????????????????????ú????????????????????????????????￡??????????“Time Chart”????????Time Chart?????????????????????С?

???????????????????????????????????????????棨Cached???????????????Network??Ajax????HTTP????Mime???????С????DNS?????????????????????????紫??????????????????????????HTTP???????????????????????????????????????????mt0.google.com??mt1.google.com???????????????????????????????????????????????????

??????????????У?WinXP????IE7????????????????????????????????20??PNG???????????м???????????????????????????????????????????????????????????????ò????????????????????????????????Щ??????????????????“???”?????????????????????????????????????3???????????????Ч????????????????????????????Domain Sharding??????CSS????CSS Sprite????

??????????????????????????????PurePath???????λ???????????Ajax??????Kind?н????????????????????????text/xml????????????????????Drill Down->PurePath??????PurePath???????????????λ??JavaScript????з??????XHR?????JavaScript???????

????????PurePath???

????????????????????dynaTrace APM??????????Server-side PurePath??????????Java??.NET?????????????Ajax??????е????????????????????????