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js web page side scrolling advertising effect with the page

高洛峰
Release： 2017-02-04 14:26:08
Original
1569 people have browsed it

a.ScrollTop calculation;
b. Positioning value calculation of scroll element;
c. Scroll cycle setting;
The code is as follows:
css part: 

/*测试用的高度*/ 
body{ height:3000px;} 
div,ul,li,body{margin:0; padding:0;} 
/*position:absolute;用于元素的定位*/ 
#roll{width:50px; height:100px; background:#99CC00; position:absolute;}
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Html code: 

<body> 
<div id="roll"></div> 
</body>
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JS code: 

var roll=document.getElementById(&#39;roll&#39;), 
initX=0, 
initY, 
compY, 
sp=15, 
//可调整时间间隔，步进值不宜过大，不然IE下有点闪屏； 
timeGap=5, 
doc=document.documentElement, 
docBody=document.body; 
compY=initY=200; 
roll.style.right=initX+"px"; 
;(function(){ 
var curScrollTop=(doc.scrollTop||docBody.scrollTop||0)-(doc.clientTop||docBody.clientTop||0); 
//每次comP的值都不一样；直到roll.style.top===doc.scrollTop+initY； 
compY+=(curScrollTop+initY-compY)/sp; 
roll.style.top=Math.ceil(compY)+"px"; 
setTimeout(arguments.callee,timeGap); 
})();
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Related labels：
Page scrolling
source：php.cn
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