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JS实现文字向上轮转（文字直播的感觉）

2013-09-24 14:56 309 查看

　　今天在公司的项目中提到一个功能，就是讲最新的用户动态在首页中直播轮转出来，一开始没什么思路，后来看了一些资料，总算知道了怎么搞，记录下，希望给大家一些帮助

这里是个demo

html页面：

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>文字滚动</title>
<style type="text/css">
body{
margin:0px;
padding:0px;
}
*{margin:0px; padding:0px;}
*{font-size:12px;}
#scroll{width:250px; height:100px; line-height:22px; overflow:hidden; background-color:#eee;}/*line-height是每次移动的距离，overflow;hidden 也不能省*/
</style>
<script type="text/javascript" src="gd.js">

</script>
</head>

<body >
<div>
<div id="scroll">
<ul>
<li>小刘发布了一款新车</li>
<li>小张发布了一款新车</li>
<li>小李发布了一款新车</li>
<li>小刘发布了一款新车</li>
<li>小张发布了一款新车</li>
<li>小李发布了一款新车</li>
<li>小刘发布了一款新车</li>
<li>小张发布了一款新车</li>
<li>1小李发布了一款新车</li>
</ul>
</div>
</div>
<script>
window.onload=function(){
new Marquee(
"scroll", //容器ID<br />
0, //向上滚动(0向上 1向下 2向左 3向右)<br />
2, //滚动的步长<br />
200, //容器可视宽度<br />
100, //容器可视高度<br />
50, //定时器数值越小，滚动的速度越快(1000=1秒,建议不小于20)<br />
1000, //间歇停顿时间(0为不停顿,1000=1秒)<br />
1000, //开始时的等待时间(0为不等待,1000=1秒)<br />
22 //间歇滚动间距(可选)<br />
);
};

</script>
</body>
</html>

JS代码：

function Marquee(){
this.ID=document.getElementById(arguments[0]);
this.Direction=arguments[1];
this.Step=arguments[2];
this.Width=arguments[3];
this.Height=arguments[4];
this.Timer=arguments[5];
this.WaitTime=arguments[6];
this.StopTime=arguments[7];
if(arguments[8]){this.ScrollStep=arguments[8];}else{this.ScrollStep=this.Direction>1?this.Width:this.Height;}
this.CTL=this.StartID=this.Stop=this.MouseOver=0;
this.ID.style.overflowX=this.ID.style.overflowY="hidden";
this.ID.noWrap=true;
this.ID.style.width=this.Width;
this.ID.style.height=this.Height;
this.ClientScroll=this.Direction>1?this.ID.scrollWidth:this.ID.scrollHeight;
this.ID.innerHTML+=this.ID.innerHTML;
this.Start(this,this.Timer,this.WaitTime,this.StopTime);
}
Marquee.prototype.Start=function(msobj,timer,waittime,stoptime){
msobj.StartID=function(){msobj.Scroll();}
msobj.Continue=function(){
if(msobj.MouseOver==1){setTimeout(msobj.Continue,waittime);}
else{clearInterval(msobj.TimerID); msobj.CTL=msobj.Stop=0; msobj.TimerID=setInterval(msobj.StartID,timer);}
}
msobj.Pause=function(){msobj.Stop=1; clearInterval(msobj.TimerID); setTimeout(msobj.Continue,waittime);}
msobj.Begin=function(){

msobj.TimerID=setInterval(msobj.StartID,timer);
msobj.ID.onmouseover=function(){msobj.MouseOver=1; clearInterval(msobj.TimerID);}
msobj.ID.onmouseout=function(){msobj.MouseOver=0; if(msobj.Stop==0){clearInterval(msobj.TimerID); msobj.TimerID=setInterval(msobj.StartID,timer);}}
}
setTimeout(msobj.Begin,stoptime);
}
Marquee.prototype.Scroll=function(){
switch(this.Direction){
case 0:
this.CTL+=this.Step;
if(this.CTL>=this.ScrollStep&&this.WaitTime>0){this.ID.scrollTop+=this.ScrollStep+this.Step-this.CTL; this.Pause(); return;}
else{if(this.ID.scrollTop>=this.ClientScroll) this.ID.scrollTop-=this.ClientScroll; this.ID.scrollTop+=this.Step;}
break;
case 1:
this.CTL+=this.Step;
if(this.CTL>=this.ScrollStep&&this.WaitTime>0){this.ID.scrollTop-=this.ScrollStep+this.Step-this.CTL; this.Pause(); return;}
else{if(this.ID.scrollTop<=0) this.ID.scrollTop+=this.ClientScroll; this.ID.scrollTop-=this.Step;}
break;
case 2:
this.CTL+=this.Step;
if(this.CTL>=this.ScrollStep&&this.WaitTime>0){this.ID.scrollLeft+=this.ScrollStep+this.Step-this.CTL; this.Pause(); return;}
else{if(this.ID.scrollLeft>=this.ClientScroll) this.ID.scrollLeft-=this.ClientScroll; this.ID.scrollLeft+=this.Step;}
break;
case 3:
this.CTL+=this.Step;
if(this.CTL>=this.ScrollStep&&this.WaitTime>0){this.ID.scrollLeft-=this.ScrollStep+this.Step-this.CTL; this.Pause(); return;}
else{if(this.ID.scrollLeft<=0) this.ID.scrollLeft+=this.ClientScroll; this.ID.scrollLeft-=this.Step;}
break;
}
}

效果还行，功能都实现了，可以根据自己的需要进行修改

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