ajax – Google即搜即得如何工作？

更新：Google刚刚发布了一篇名为 Google Instant,behind the scenes的博客文章。这是一个有趣的阅读，显然与这个问题有关。您可以阅读他们如何处理服务器端的额外负载(根据文章为5-7X)，例如。下面的答案检查了客户端会发生什么：

使用Firebug进行检查时，Google会对每个按键执行一次Ajax GET请求：

我想它的工作方式与自动完成相同。但是这次，它还返回以JSON格式的部分完整搜索短语的搜索结果。

在输入“Stack Overflow”时检查一个JSON响应：

我们可以看到，JSON响应包含在我们键入时构造搜索结果的内容。

格式化的JSON响应如下所示：

{
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Ix26#39;m working with someone elsex26#39;s PHP function that works fine as long as I pass it at least three arguments. If I pass it two argument,x3cbx3e...x3c/bx3ex3cbrx3ex3cspan classx3dfx3ex3ccitex3ex3cbx3estackoverflowx3c/bx3e.com/questionsx3c/citex3e - x3cspan classx3dglx3ex3ca hrefx3dx22http://webcache.googleusercontent.com/search?qx3dcache:6S_0sErDKfQJ:stackoverflow.com/questions+Stack+Overflowx26amp;cdx3d2x26amp;hlx3denx26amp;ctx3dclnkx22 onmousedownx3dx22return rwt(this,x27AFQjCNH7WHzefYlnS05ln4j6rzfE3byDKgx27,x270CCcQIDABx27)x22x3eCachedx3c/ax3e - x3ca hrefx3dx22/search?hlx3denx26amp;qx3drelated:stackoverflow.com/questions+Stack+Overflowx26amp;tbox3d1x26amp;sax3dXx26amp;eix3dj9iHTLXlLNmXOJLQ3cMOx26amp;sqix3d2x26amp;vedx3d0CCgQHzABx22x3eSimilarx3c/ax3ex3c/spanx3ex3c/spanx3ex3c/divx3ex3c!--n--x3ex3c!--m--x3ex3cli classx3dgx3ex3ch3 classx3dx22rx22x3ex3ca hrefx3dx22http://en.wikipedia.org/wiki/Stack_overflowx22 classx3dl onmousedownx3dx22return rwt(this,x273x27,x27AFQjCNEAxaeWmWtD7cBcmZ5QBMsTRNbnCwx27,x270CCkQFjACx27)x22x3ex3cemx3eStack overflowx3c/emx3e - Wikipedia,the free encyclopediax3c/ax3ex3c/h3x3ex3cdiv classx3dx22sx22x3eIn software,a x3cemx3estack overflowx3c/emx3e occurs when too much memory is used on the call stack. The call stack contains a limited amount of memory,often determined at x3cbx3e...x3c/bx3ex3cbrx3ex3cspan classx3dfx3ex3ccitex3een.wikipedia.org/wiki/x3cbx3eStackx3c/bx3e_x3cbx3eoverflowx3c/bx3ex3c/citex3e - x3cspan classx3dglx3ex3ca hrefx3dx22http://webcache.googleusercontent.com/search?qx3dcache:mWu8b0BQAmwJ:en.wikipedia.org/wiki/Stack_overflow+Stack+Overflowx26amp;cdx3d3x26amp;hlx3denx26amp;ctx3dclnkx22 onmousedownx3dx22return rwt(this,x27AFQjCNFG_5ndK-KmWJy6s3pOsi8lsxqEZgx27,x270CCsQIDACx27)x22x3eCachedx3c/ax3e - x3ca hrefx3dx22/search?hlx3denx26amp;qx3drelated:en.wikipedia.org/wiki/Stack_overflow+Stack+Overflowx26amp;tbox3d1x26amp;sax3dXx26amp;eix3dj9iHTLXlLNmXOJLQ3cMOx26amp;sqix3d2x26amp;vedx3d0CCwQHzACx22x3eSimilarx3c/ax3ex3c/spanx3ex3c/spanx3ex3c/divx3ex3c!--n--x3ex3c!--m--x3ex3cli classx3dgx3ex3ch3 classx3dx22rx22x3ex3ca hrefx3dx22http://blog.stackoverflow.com/x22 classx3dl onmousedownx3dx22return rwt(this,x274x27,x270CC0QFjADx27)x22x3eBlog – x3cemx3eStack Overflowx3c/emx3ex3c/ax3ex3c/h3x3ex3cdiv classx3dx22sx22x3e6 Sep 2010 x3cbx3e...x3c/bx3e The latest version of the x3cemx3eStack Overflowx3c/emx3e Trilogy Creative Commons Data Dump is now available. This reflects all public  data in … x3cbx3e...x3c/bx3ex3cbrx3ex3cspan classx3dfx3ex3ccitex3eblog.x3cbx3estackoverflowx3c/bx3e.com/x3c/citex3e - x3cspan classx3dglx3ex3ca hrefx3dx22http://webcache.googleusercontent.com/search?qx3dcache:iqtvg9Ge1c0J:blog.stackoverflow.com/+Stack+Overflowx26amp;cdx3d4x26amp;hlx3denx26amp;ctx3dclnkx22 onmousedownx3dx22return rwt(this,x27AFQjCNFX2P2-RTCs_GaR6NgSw30p007UEAx27,x270CC8QIDADx27)x22x3eCachedx3c/ax3e - x3ca hrefx3dx22/search?hlx3denx26amp;qx3drelated:blog.stackoverflow.com/+Stack+Overflowx26amp;tbox3d1x26amp;sax3dXx26amp;eix3dj9iHTLXlLNmXOJLQ3cMOx26amp;sqix3d2x26amp;vedx3d0CDAQHzADx22x3eSimilarx3c/ax3ex3c/spanx3ex3c/spanx3ex3c/divx3ex3c!--n--x3ex27,_ss);x3c/scriptx3e"
}/*""*/{
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Homex3c/ax3ex3c/h3x3ex3cdiv classx3dx22sx22x3ex3cemx3eStackOverflowx3c/emx3e Dev Days is run by Carsonified,so please give us a shout if you need anything or are interested in sponsoring the event. x3cbx3e...x3c/bx3ex3cbrx3ex3cspan classx3dfx3ex3ccitex3ex3cbx3estackoverflowx3c/bx3e.carsonified.com/x3c/citex3e - x3cspan classx3dglx3ex3ca hrefx3dx22http://webcache.googleusercontent.com/search?qx3dcache:uhl8NPgikN0J:stackoverflow.carsonified.com/+Stack+Overflowx26amp;cdx3d8x26amp;hlx3denx26amp;ctx3dclnkx22 onmousedownx3dx22return rwt(this,x27AFQjCNFf9Vl5L3FaQGPapUpIFw5gqVUCnAx27,x270CD8QIDAHx27)x22x3eCachedx3c/ax3e - x3ca hrefx3dx22/search?hlx3denx26amp;qx3drelated:stackoverflow.carsonified.com/+Stack+Overflowx26amp;tbox3d1x26amp;sax3dXx26amp;eix3dj9iHTLXlLNmXOJLQ3cMOx26amp;sqix3d2x26amp;vedx3d0CEAQHzAHx22x3eSimilarx3c/ax3ex3c/spanx3ex3c/spanx3ex3c/divx3ex3c!--n--x3ex3c!--m--x3ex3cli classx3dgx3ex3ch3 classx3dx22rx22x3ex3ca hrefx3dx22http://stackoverflow.org/x22 classx3dl onmousedownx3dx22return rwt(this,x279x27,x27AFQjCNF-YrPvTLTJlFFDJrJE0cjGdlOpbgx27,x270CEEQFjAIx27)x22x3ex3cemx3eStackOverflowx3c/emx3e.orgx3c/ax3ex3c/h3x3ex3cdiv classx3dx22sx22x3ex3cemx3eStackOverflowx3c/emx3e.org began as the merging of two ideas that have been kicking around in my head for years. First,I wanted a dorky programming-related domain x3cbx3e...x3c/bx3ex3cbrx3ex3cspan classx3dfx3ex3ccitex3ex3cbx3estackoverflowx3c/bx3e.org/x3c/citex3e - x3cspan classx3dglx3ex3ca hrefx3dx22http://webcache.googleusercontent.com/search?qx3dcache:u0dIlJW-XMYJ:stackoverflow.org/+Stack+Overflowx26amp;cdx3d9x26amp;hlx3denx26amp;ctx3dclnkx22 onmousedownx3dx22return rwt(this,x27AFQjCNHcJcV2QVybr6voztyPwHCrNOOD1wx27,x270CEMQIDAIx27)x22x3eCachedx3c/ax3e - x3ca hrefx3dx22/search?hlx3denx26amp;qx3drelated:stackoverflow.org/+Stack+Overflowx26amp;tbox3d1x26amp;sax3dXx26amp;eix3dj9iHTLXlLNmXOJLQ3cMOx26amp;sqix3d2x26amp;vedx3d0CEQQHzAIx22x3eSimilarx3c/ax3ex3c/spanx3ex3c/spanx3ex3c/divx3ex3c!--n--x3ex3c!--m--x3ex3cli classx3dgx3ex3ch3 classx3dx22rx22x3ex3ca hrefx3dx22http://embeddedgurus.com/stack-overflow/x22 classx3dl onmousedownx3dx22return rwt(this,x2710x27,x27AFQjCNFYQ5E8irNUCpRsbOHHyfc0oqGpWwx27,x270CEUQFjAJx27)x22x3ex3cemx3eStack Overflowx3c/emx3ex3c/ax3ex3c/h3x3ex3cdiv classx3dx22sx22x3ex3cemx3eStack Overflowx3c/emx3e. Nigel Jones. Nigel Jones has over 20 years of experience designing electronic circuits and firmware. (full bio). Pages. Contact Nigel. 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