float.js

来自「Struts+Spring+Hibernate实现的在线拍卖系统,去掉了这些组件」· JavaScript 代码 · 共 41 行

var fixedBanner = {};
var pass="";
fixedBanner.ele = document.getElementById('floater');
fixedBanner.top = 0;

/*DO NOT MODIFY*/

if ((screen.width <= 800) && (screen.height <= 600)){
		var pass=false;
		 } else{
		var pass=true;
		 }
		fixedBanner.y = 0;
		fixedBanner.getPagePosition = function(){
	 	var y;
	 	if (document.documentElement && document.documentElement.scrollTop){
	 		y = document.documentElement.scrollTop;
	 	}else if(document.body){
	 		y = document.body.scrollTop;
	 	}else{
	 		y = document.getElementsByTagName('body')[0].scrollTop;
	 	}
	 		fixedBanner.h = fixedBanner.ele.getElementsByTagName('div')[0].offsetHeight;
	 		return y;
	}
		fixedBanner.setPosition = function(){
	if(pass==false){
		 fixedBanner.ele.style.display="none";
		 return;
	 }
	 var z = fixedBanner.getPagePosition();
	 if(fixedBanner.y != z){
	 	z = fixedBanner.y + (z - fixedBanner.y)/2 + fixedBanner.top;
	 		if (z+fixedBanner.h+120 > document.body.scrollHeight)
	 			return;
		 fixedBanner.ele.style.top = z + 'px';
		 fixedBanner.y = z;
	}
}
	
	setInterval(fixedBanner.setPosition,100);