DOM（十四）：代理检测和事件处理（跨浏览器）

[code]/*
*用户代理检测脚本，检测范围包括浏览器引擎、平台、Windows、移动设备和游戏系统
*/
var client = function()
{
//呈现引擎
var engine = {
ie:0,           //ie
gecko:0,    //火狐
webkit:0,   //chrome和safari
khtml:0,     //Linux下的Konqueror
opera:0,     //opera
ver:null      //完整版本号
};

//浏览器
var browser = {
ie:0,
firefox:0,
safari:0,
konq:0,
opera:0,
chrome:0,
ver:null        //具体版本号
};

//平台、设备和操作系统
var system = {
//操作系统
win:false,
mac:false,
xll:false,       //UNIX

//移动设备
iphone:false,
ipod:false,
ipad:false,
ios:false,
android:false,
nokiaN:false,      //诺基亚
winMobile:false,  //windows mobile

//游戏系统
wii:false,          //Wii
ps:false            //Playstation 3
};

//检测呈现引擎和浏览器
var ua = navigator.userAgent;
if(window.opera)
{
engine.ver = browser.ver = window.opera.version();
engine.opera = browser.opera = parseFloat(engine.ver);
}
else if(/AppleWebkit\/(\S+)/.test(ua ))
{
engine.ver = RegExp["$1"];
engine.webkit = parseFloat(engine.ver);

//确定是chrome还是safari
if(/Chrome\/(\S+)/.test(ua))
{
browser.ver = RegExp["$1"];
browser.chrome = parseFloat(browser.ver);
}
else if(/Version\/(\S+)/.test(ua))
{
browser.ver = RegExp["$1"];
browser.safari = parseFloat(browser.ver);
}
else
{
// 近似确定版本号
var safariVersion = 1;
if(engine.webkit < 100)
{
safariVersion = 1;
}
else if(engine.webkit < 312)
{
safariVersion = 1.2;
}
else if(engine.webkit < 412)
{
safariVersion = 1.3;
}
else
{
safariVersion = 2;
}
browser.safari = browser.ver = safariVersion;
}
}
else if(/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^; ]+)/.test(ua))
{
engine.ver = browser.ver = RegExp["$1"];
engine.khtml = browser.konq = parseFloat(engine.ver);
}
else if (/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua))
{
engine.ver = RegExp["$1"];
engine.gecko = parseFloat(engine.ver);

// 确定是不是FireFox
if(/firefox\/(\S+)/test(ua))
{
browser.ver = RegExp["$1"];
browser.firefox = parseFloat(engine.ver);
}
}
else if(/MISE ([^; ]+)/.test(ua))
{
engine.ver = browser.ver = RegExp["$1"];
engine.ie = browser.ie = parseFloat(engine.ver);
}

// 检测浏览器
browser.ie = engine.ie;
browser.opera = engine.opera;

// 检测平台
var p = navigator.platform;
system.win = p.indexOf("Win") == 0;
system.mac = p.indexOf("Mac") == 0;
system.xll = (p == "xll") || (p.indexOf("Linux") == 0);

// 检测windows操作系统
if(system.win)
{
if(/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua))
{
if(RegExp["$1"] == "NT")
{
switch(RegExp["$2"])
{
case "5.0":
system.win = "2000";
break;
case "5.1":
system.win = "XP";
break;
case "6.0":
system.win = "Vista";
break;
case "6.1":
system.win = "7";
break;
default:
system.win = "NT";
break;
}
}
else if(RegExp["$1"] == "9x")
{
system.win = "ME";
}
else
{
system.win = RegExp["$1"];
}
}
}

// 移动设备
system.iphone = ua.indexOf("iPhone") > -1;
system.ipod = ua.indexOf("iPod") > -1;
system.ipad = ua.indexOf("iPad") > -1;
system.nokiaN = ua.indexOf("NokiaN") > -1;

// windows mobile
if(system.win == "CE")
{
system.winMobile = system.win;
}
else if(system.win == "Ph")
{
if(/Windows Phone OS (\d+.\d+)/.test(ua))
{
system.win = "Phone";
system.winMobile = parseFloat(RegExp["$1"]);
}
}

// 检测IOS版本
if(system.mac && ua.indexOf("Mobile") > -1)
{
if(/CPU (?:iPhone )?OS (\d+_\d+)/.test(ua))
{
system.ios = parseFloat(RegExp.$1.replace("_","."));
}
else
{
system.ios = 2;
}
}

// 检测Android
if(/Android (\d+\.\d+)/.test(ua))
{
system.android = parseFloat(RegExp.$1);
}

// 游戏系统
system.wii = ua.indexOf("Wii") > -1;
system.ps = /playstation/i.test(ua);

// 返回结果
return {
engine:engine,
browser:browser,
system:system
};
}();

/* *参数：ele-->元素，type-->事件类型，不带on,handler-->事件处理程序 */ var EventHandler = { addHandler:function(ele,type,handler){               //添加处理程序 // DOM2级事件处理 if(ele.addEventListener){ ele.addEventListener(type,handler,false); }else if(ele.attachEvent){ ele.attachEvent("on"+type,handler); }else{ // DOM0级事件处理 ele["on"+type] = handler; } }, removeHandler:function(ele,type,handler){            //删除处理程序 if(ele.removeEventListener){ ele.removeEventListener(type,handler,false); }else if(ele.detachEvent){ ele.detachEvent("on"+type,handler); }else{ ele["on"+type] = null; } },

getEvent:function(event){ //获取事件对象

return event?event:window.event;

},

getTarget:function(event){ //获取事件目标

return event.target || event.srcElement;

},

preventDefault:function(event){ //阻止事件默认行为

if(event.preventDefault){

event.preventDefault();

}else{

event.returnValue = false;

}

},

stopPropagation:function(event){ //阻止事件流

if(event.stopPropagation){

event.stopPropagation();

}else{

event.cancelBubble = true;

}

},

getRelatedTarget:function(event){ //在mouseover和mouseout中获取相关元素

if(event.relatedTarget){

return event.relatedTarget;

}else if(event.toElement){ //IE8及以下版本不支持relatedTarget属性

return event.toElement;

}else if(event.fromElement){

return event.fromElement;

}else{

return null;

}

}，

getWheelDelta:function(event){ //获取鼠标滚轮数据

if(event.wheelDelta){

return (client.engine.opera && client.engine.opera < 9.5?-event.wheelDelta:event.wheelDelta);

}else{

return –event.detail*40; //针对FireFox

}

},

getCharCode:function(event){ //获取字符编码

if(event.charCode == “number”){

return event.charCode;

}else{

return event.keyCode;

}

}, };