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jQuery.fn.floatdiv=function(location){
//判断浏览器版本
var isIE6=false;
var Sys = {};
var ua = navigator.userAgent.toLowerCase();
var s;
(s = ua.match(/msie ([d.]+)/)) ? Sys.ie = s[1] : 0;
if(Sys.ie && Sys.ie=="6.0"){
isIE6=true;
}
var windowWidth,windowHeight;//窗口的高和宽
//取得窗口的高和宽
if (self.innerHeight) {
windowWidth=self.innerWidth;
windowHeight=self.innerHeight;
}else if (document.documentElement&&document.documentElement.clientHeight) {
windowWidth=document.documentElement.clientWidth;
windowHeight=document.documentElement.clientHeight;
} else if (document.body) {
windowWidth=document.body.clientWidth;
windowHeight=document.body.clientHeight;
}
return this.each(function(){
var loc;//层的绝对定位位置
var wrap=$("<div></div>");
var top=-1;
if(location==undefined || location.constructor == String){
switch(location){
case("rightbottom")://右下角
loc={right:"0px",bottom:"0px"};
break;
case("leftbottom")://左下角
loc={left:"0px",bottom:"0px"};
break;
case("lefttop")://左上角
loc={left:"0px",top:"0px"};
top=0;
break;
case("righttop")://右上角
loc={right:"0px",top:"0px"};
top=0;
break;
case("middletop")://居中置顶
loc={left:windowWidth/2-$(this).width()/2+"px",top:"0px"};
top=0;
break;
case("middlebottom")://居中置低
loc={left:windowWidth/2-$(this).width()/2+"px",bottom:"0px"};
break;
case("leftmiddle")://左边居中
loc={left:"0px",top:windowHeight/2-$(this).height()/2+"px"};
top=windowHeight/2-$(this).height()/2;
break;
case("rightmiddle")://右边居中
loc={right:"0px",top:windowHeight/2-$(this).height()/2+"px"};
top=windowHeight/2-$(this).height()/2;
break;
case("middle")://居中
var l=0;//居左
var t=0;//居上
l=windowWidth/2-$(this).width()/2;
t=windowHeight/2-$(this).height()/2;
top=t;
loc={left:l+"px",top:t+"px"};
break;
default://默认为右下角
location="rightbottom";
loc={right:"0px",bottom:"0px"};
break;
}
}else{
loc=location;
alert(loc.bottom);
var str=loc.top;
//09-11-5修改：加上top为空值时的判断
if (typeof(str)!= 'undefined'){
str=str.replace("px","");
top=str;
}
}
/*fied ie6 css hack*/
if(isIE6){
if (top>=0)
{
wrap=$("<div style="top:expression(documentElement.scrollTop+"+top+");"></div>");
}else{
wrap=$("<div style="top:expression(documentElement.scrollTop+documentElement.clientHeight-this.offsetHeight);"></div>");
}
}
$("body").append(wrap);
wrap.css(loc).css({position:"fixed",z_index:"999"});
if (isIE6)
{
wrap.css("position","absolute");
//没有加这个的话，ie6使用表达式时就会发现跳动现象
//至于为什么要加这个，还有为什么要加nothing.txt这个，偶也不知道，希望知道的同学可以告诉我
$("body").css("background-attachment","fixed").css("background-image","url(n1othing.txt)");
}
//将要固定的层添加到固定层里
$(this).appendTo(wrap);
});
};
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