AJAX案例研究之google suggest

原文发表在 http://www.blogjava.net/emu/archive/2005/11/29/21786.html

google suggest比起gmail要好对付的多了，就一个页面一个脚本文件，代码都一目了然，可惜用了google域名，在调的时候经常连接被断掉，最后还是找了一个代理才调通了代码。可以在本地运行的google suggest请在这个连接下载：

http://www.blogjava.net/Files/emu/suggest.rar

其中的脚本文件ac.js已经做了一点整理，关键的qc函数crack了一下，使它可以找到服务器：

function qc(ac){
if (l && l.readyState != 0 ){
l.abort()
}
l = vb();
if (l){
l.open( " GET " , " http://www.google.com " + Aa + " &js=true&qu= " + ac, true );
l.onreadystatechange = function (){
if (l.readyState == 4 && l.responseText){
if (l.responseText.charAt( 0 ) == " < " ){
V --
} else {
eval(l.responseText)
}
}
};
l.send( null )
}
}

插个断点就可以看到，比如我们在输入框中输入了“AJAX”，google suggest就向服务器请求这样一个资源：

http://www.google.com/complete/search?hl=en&js=true&qu=AJAX

而服务器则返回：

sendRPCDone(frameElement,"ajax",newArray("ajax","ajaxamsterdam","ajaxfc","ajaxontario","ajaxgrips","ajaxfootballclub","ajaxpubliclibrary","ajaxfootball","ajaxsoccer","ajaxpickeringtransit"),newArray("3,840,000results","502,000results","710,000results","275,000results","8,860results","573,000results","40,500results","454,000results","437,000results","10,700results"),newArray(""));

剩下的大家都会做了，不多废话。