Register protocol，此文中对于 Windows、Linux 和 OS X 操作系统如何注册协议都有说明。比如说 Windows，其实只需写入注册表，即可实现协议与执行程序的关联。例如腾讯的Tencent://Message协议注册表如下：

[HKEY_CLASSES_ROOT\TENCENT]
@=”TencentProtocol”
“URL Protocol”=”D:\\Program Files\\Tencent\\QQ\\Timwp.exe”

[HKEY_CLASSES_ROOT\TENCENT\DefaultIcon]
@=”D:\\Program Files\\Tencent\\QQ\\Timwp.exe,1″

[HKEY_CLASSES_ROOT\TENCENT\shell]

[HKEY_CLASSES_ROOT\TENCENT\shell\open]

[HKEY_CLASSES_ROOT\TENCENT\shell\open\command]
@=”\”D:\\Program Files\\Tencent\\QQ\\Timwp.exe\” \”%1\”"

此注册表所实现的就是当浏览器（或其它）碰到 tencent://… 时，自动调用 Timwp.exe，并把 tencent://… 地址作为第一个参数传递给 Timwp.exe。

更多参见：Registering an Application to a URL Protocol。 

var userAgent = navigator.userAgent.toLowerCase();

var ie=/msie/.test( userAgent ) && !/opera/.test( userAgent );

var g = {

closeWindow:function(){

if ((ie&&window.history.length>0) || (!ie&&window.history.length>1)){

window.history.back(1);

return;

}

if (ie) {

window.opener = null;

window.open('','_top');

window.top.close();

}

}

,report:function(id,sigt){

var img = document.createElement("img");

img.src = "http://wp.qq.com/cgi-bin/api_attr?id="+id+"&SigT="+sigt;

}

,checkActiveX:function(){

var kXmlHttp = null;

try{

if(typeof XMLHttpRequest != "undefined"){

kXmlHttp = new XMLHttpRequest();

return true;

}

}

catch(e){}        var aVersionhs = ["MSXML2.XMLHttp.3.0","MSXML2.XMLHttp.6.0","MSXML2.XMLHttp","Microsoft.XMLHttp","MSXML2.XMLHttp.5.0","MSXML2.XMLHttp.4.0"];

for(var i=0;i<aVersionhs.length;i++){

try{

kXmlHttp = new ActiveXObject(aVersionhs[i]);

return true;

}

catch(e){}        

}

return false;

}

};

window.onload=function(){

var location = "tencent://message/?Menu=yes&uin=173251213&Site=&Service=201&sigT=afb8bca7ae5c962750b1ff8aa52d89d4a45faae2295dc6c297628ca3f1657abd7f3318ccf77de13bdd57fa0181a2223c&sigU=4dae486d846243a13ad46281d67cf0864a9bbcda250cf9e93168989602bee02d55bfcad34f2ad62c";

var sigt = location.replace(/^\S+sigT=/g,"").replace(/&\S+$/g,"");

if(!ie){

g.report(2,sigt);

window.location=location;

window.setTimeout(function(){

g.closeWindow()

}

,200);

}

else{

if (!g.checkActiveX()) {

window.location=location;

return;

}

try{

var cpTimwp = new ActiveXObject("TimwpDll.TimwpCheck");

if(cpTimwp){

window.location=location;

window.setTimeout(g.closeWindow,200);

return;

}

}

catch(e){

if(ie){

g.report(1,sigt);

window.location="http://wp.qq.com/check_qq.html?urltencent=" + encodeURIComponent(location) +                   "&sigt=" + encodeURIComponent(sigt);

}

}

}

};