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else if (checkIt('opera')) browser = "Opera"
else if (checkIt('Webtv')) browser = "WebTV";
else if (checkIt('icab')) browser = "iCab"
else if (checkIt('msie')) browser = "Internet Explorer"
else if (!checkIt('compatible')) {
browser = "Netscape Navigator"
version = detect.charAt(8);
}
else browser = "An unknown browser";
if (!version) version = detect.charAt(place thestring.length);
if(!OS) {
if (checkIt('linux')) OS = "Linux";
else if (checkIt('x11')) OS = "Unix";
else if (checkIt('mac')) OS = "Mac"
else if (checkIt('win')) OS = "Windows"
else OS = "an unknown operating system";
}
}
function checkIt(string) {
place = detect.indexOf(string) 1;
thestring = string;
return place;
}
下面看一下网页加载时需要添加的方法。有关网页加载和初始化方法代码如下：
//网页加载调用initialize和getBrowserInfo方法
Event.observe(window, 'load', initialize, false);
Event.observe(window, 'load', getBrowserInfo, false);
//未加载时清空缓存
Event.observe(window, 'unload', Event.unloadCache, false);
//初始化方法
function initialize(){
//调用该方法为该页添加覆盖层和高亮显示层
addLightboxMarkup();
//为每个可高亮显示的元素创建lightbox对象
lbox = document.getElementsByClassName('lbOn');
for(i = 0; i < lbox.length; i ) {
valid = new lightbox(lbox[i]);
}
}
// 使用Dom方法创建覆盖层和高亮层
function addLightboxMarkup() {
bod = document.getElementsByTagName('body')[0];
overlay = document.createElement('div');
overlay.id = 'overlay';
lb = document.createElement('div');
lb.id = 'lightbox';
lb.className = 'loading';
lb.innerHTML = '<div id="lbLoadMessage">'
'<p>Loading</p>'
'</div>';
bod.appendChild(overlay);
bod.appendChild(lb);
}
封装lightbox类
初始化数据时，为每个可高亮显示的链接创建了lightbox对象。该类的代码具体实现如下：
var lightbox = Class.create();
lightbox.prototype = {
yPos : 0,
xPos : 0,
//构造方法,ctrl为创建该对象的元素
initialize: function(ctrl) {
//将该元素的链接赋值给this.content
this.content = ctrl.href;
//为该元素添加onclick事件activate方法
Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
ctrl.onclick = function(){return false;};
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