capacityFixed 基于jquery的类似于新浪微博新消息提示的定位框

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.float { width:200px; padding:5px 10px; border:1px solid #ffecb0; font-size:12px; background-color:#fffee0; -moz-box-shadow:1px 1px 2px rgba(0,0,0,.2); -webkit-box-shadow:1px 1px 2px rgba(0,0,0,.2); box-shadow:1px 1px 2px rgba(0,0,0,.2); position:absolute; -moz-border-radius:5px; -webkit-border-radius:5px; border-radius:5px; }
.float .close-ico{ position:absolute; top:5px; right:5px; display:block; width:16px; height:16px; background-image:url(img/close-ico.png); text-indent:-900px; overflow:hidden; }
.float .close-ico:hover{ background-position:0 -16px;}
.float p{ line-height:22px}

/**
* @author 愚人码头
* 类似于新浪微博新消息提示的定位框
* 更多
*/
(function($){
$.fn.capacityFixed = function(options) {
var opts = $.extend({},$.fn.capacityFixed.deflunt,options);

var FixedFun = function(element) {
var top = opts.top;
var right = ($(window).width()-opts.pageWidth)/2+opts.right;
element.css({
"right":right,
"top":top
});
$(window).resize(function(){
var right = ($(window).width()-opts.pageWidth)/2+opts.right;
element.css({
"right":right
});
});
$(window).scroll(function() {
var scrolls = $(this).scrollTop();
if (scrolls > top) {

if (window.XMLHttpRequest) {
element.css({
position: "fixed",
top: 0
});
} else {
element.css({
top: scrolls
});
}
}else {
element.css({
position: "absolute",
top: top
});
}
});
element.find(".close-ico").click(function(event){
element.remove();
event.preventDefault();
})
};
return $(this).each(function() {
FixedFun($(this));
});
};
$.fn.capacityFixed.deflunt={
right : 100,//相对于页面宽度的右边定位
top:100,
pageWidth : 960
};
})(jQuery);