请问如何做一个滚动字幕？

[artak]

请问如何做一个滚动字幕？不要marque，因为用marque的时候，进入页面或者刷新页面，总是空白，然后字幕才慢慢滚出来的
要求进去，就是一屏字幕，然后才滚，而不是空白，在滚出来

[brio8425]

滚动的效果似乎baidu里好多很多。。。。。。

[shine_fly]

var __scrollBarControl = null;

function innerBarProp(barID, width, height, interval, direction)
{
 this.barID = barID;
 this.width = width;
 this.height = height;
 this.interval = interval;
 this.direction = direction;
 this.stopScroll = false;
 this.maxValue = 0;
 this.preValue = 0;
}

function scrollBar()
{
 this.barsArray = new Array();
 //save current object
 __scrollBarControl = this;
}

scrollBar.prototype.addBar = function(barID, width, height, interval, direction)
{
 //check parameters
 var paraCount = arguments.length;
 if ( paraCount < 1 )
 {
  alert("parameters count incorect!");
  return;
  //throw "parameters count inccorect!";
 }
 
 //width's default value
 if ( typeof( width ) == "undefined" )
 {
  var width = 100;
 }
 
 //height's default value
 if ( typeof( height ) == "undefined" )
 {
  var height = 100;
 }
 
 //interval's default value
 if ( typeof( interval ) == "undefined" )
 {
  var interval = 1000;
 }
 
 //direction's default value
 if ( typeof( direction ) == "undefined" )
 {
  var direction = "up";
 }
 
 //create scrollbar's inner properties
 var barProp = new innerBarProp(barID, width, height, interval, direction);
 var barCount = this.barsArray.length;
 this.barsArray[barCount] = barProp;
}

scrollBar.prototype.createScrollBars = function()
{
 //get bar's count
 var barCount = this.barsArray.length;
 //if no bar add to scrollControl do nothing
 if ( barCount == 0 )
 {
  return;
 }
 
 //init scroll bars
 for ( var i=0; i<barCount; i++ )
 {
  var objBarID = this.barsArray[i].barID;
  //if typeof objBarID is object
  // that's meaning it inited
  //if typeof objBarID is string
  // init that scroll bar
  if ( typeof( objBarID ) == "string" )
  {
   //get scroll <DIV> object
   var objBar = document.getElementById( objBarID );
   if (objBar == null)
   {
    //objBarID is not exist
    if ( document.readyState == "complete" || document.readyState == "loaded" )
    {
     //the objBarID not exists in current document
     //throw "the objBarID is not exists.";
     alert("ScrollBar[" + objBarID + "]: not exist!");
     return;
    }
    else
    {
     //wait for document to load objBarID
     window.setTimeout("__scrollBarControl.createScrollBars()",50);
     //exit processing..........
     //and wait next time callbak
     return;
    }
   }
   
   //update barID
   this.barsArray[i].barID = objBar;
  }
 }
 
 for ( var i=0; i<barCount; i++ )
 {
  this.innerInitBar(i);
 }
}

scrollBar.prototype.innerInitBar = function (index)
{ 
 //get properties
 var barID = this.barsArray[index].barID;
 var width = this.barsArray[index].width;
 var height = this.barsArray[index].height;
 var interval = this.barsArray[index].interval;
 var direction = this.barsArray[index].direction;
 var maxValue = 0;
 
 //set scrollBar's properties
 with(barID)
 {
  style.width = width;
  style.height = height;
  noWrap=true;

  switch( direction )
  {
   case "up":
    maxValue = Math.max(scrollHeight, height);
    style.overflowX = "visible";
    style.overflowY = "hidden";
    var barHtml = innerHTML;
    var newHtml = "<table border='0' cellspacing='0' cellpadding='0'>\n";
    newHtml += "  <tr>\n";
    newHtml += "    <td height='" + maxValue + "' valign='top'>\n";
    newHtml += barHtml + "\n";
    newHtml += "    </td>\n";
    newHtml += "  </tr>\n";
    newHtml += "  <tr>\n";
    newHtml += "    <td height='" + maxValue + "' valign='top'>\n";
    newHtml += barHtml + "\n";
    newHtml += "    </td>\n";
    newHtml += "  </tr>\n";
    newHtml += "</table>\n";
    innerHTML = newHtml;
    break;
   case "down":
    maxValue = Math.max(scrollHeight, height);
    style.overflowX = "visible";
    style.overflowY = "hidden";
    var barHtml = innerHTML;
    var newHtml = "<table border='0' cellspacing='0' cellpadding='0'>\n";
    newHtml += "  <tr>\n";
    newHtml += "    <td height='" + maxValue + "' valign='top'>\n";
    newHtml += barHtml + "\n";
    newHtml += "    </td>\n";
    newHtml += "  </tr>\n";
    newHtml += "  <tr>\n";
    newHtml += "    <td height='" + maxValue + "' valign='top'>\n";
    newHtml += barHtml + "\n";
    newHtml += "    </td>\n";
    newHtml += "  </tr>\n";
    newHtml += "</table>\n";
    innerHTML = newHtml;
    scrollTop = maxValue;
    break;
   case "left":
    maxValue = Math.max(scrollWidth, width);
    style.overflowX = "hidden";
    style.overflowY = "visible";
    var barHtml = barID.innerHTML;
    var newHtml = "<table border='0' cellspacing='0' cellpadding='0' width='" + (maxValue * 2 ) + "'>\n";
    newHtml += "  <tr>\n";
    newHtml += "    <td width='" + maxValue + "' valign='top'>\n";
    newHtml += barHtml + "\n";
    newHtml += "    </td>\n";
    newHtml += "    <td width='" + maxValue + "' valign='top'>\n";
    newHtml += barHtml + "\n";
    newHtml += "    </td>\n";
    newHtml += "  </tr>\n";
    newHtml += "</table>\n";
    innerHTML = newHtml;
    break;
   case "right":
    maxValue = Math.max(scrollWidth, width);
    style.overflowX = "hidden";
    style.overflowY = "visible";
    var barHtml = innerHTML;
    var newHtml = "<table border='0' cellspacing='0' cellpadding='0' width='" + (maxValue * 2 ) + "'>\n";
    newHtml += "  <tr>\n";
    newHtml += "    <td width='" + maxValue + "' valign='top'>\n";
    newHtml += barHtml + "\n";
    newHtml += "    </td>\n";
    newHtml += "    <td width='" + maxValue + "' valign='top'>\n";
    newHtml += barHtml + "\n";
    newHtml += "    </td>\n";
    newHtml += "  </tr>\n";
    newHtml += "</table>\n";
    innerHTML = newHtml;
    scrollLeft = maxValue;
    break;
   default:
    //throw "direction is inccorect!";
    alert("ScrollBar[" + id + "]: direction is incorect!");
    return;
  }
  
  //set mouse events
  onmouseover = new Function("__scrollBarControl.mouseEvt(" + index + ",true);");
  onmouseout = new Function("__scrollBarControl.mouseEvt(" + index + ",false);");
  window.setInterval("__scrollBarControl.scroll(" + index + ");",interval);
  
  //save maxValue
  this.barsArray[index].maxValue = maxValue;
 }
}

scrollBar.prototype.mouseEvt = function(index, stop)
{
 this.barsArray[index].stopScroll = stop;
}

scrollBar.prototype.scroll = function(index)
{
 //get properties
 var barID = this.barsArray[index].barID;
 var width = this.barsArray[index].width;
 var height = this.barsArray[index].height;
 var interval = this.barsArray[index].interval;
 var direction = this.barsArray[index].direction;
 var stopScroll = this.barsArray[index].stopScroll;
 var preValue = this.barsArray[index].preValue;
 var maxValue = this.barsArray[index].maxValue;
 
 if ( stopScroll == true ) return;
 
 switch(direction)
 {
  case "up":
    preValue++;
    if ( preValue >= maxValue )
    {
     preValue = 0;
    }
    barID.scrollTop = preValue;
    break;
  case "down":
    preValue--;
    if ( preValue <= 0 )
    {
     preValue = maxValue;
    }
    barID.scrollTop = preValue;
    break;
  case "left":
    preValue++;
    if ( preValue >= maxValue )
    {
     preValue = 0;
    }
    barID.scrollLeft = preValue;
    break;
  case "right":
    preValue--;
    if ( preValue <=0 )
    {
     preValue = maxValue;
    }
    barID.scrollLeft = preValue;
    break;
 }
 this.barsArray[index].preValue = preValue;
}

[anncesky]

这可很容易啊，，，星星啊，可能你对JS不怎么了解

就是用一个DIV装入文字，把它的div.style.Left=div.style.Left-1做递归
控制头尾就可以

[jiangzhe556]

http://download.csdn.net/source/829139

去这里下吧!我都实验过了,都可以用的,无缝滚动向上向下向左向右的代码
DIV实现的

[twin21cn]

用JS代码控制

[zengxiongbin]

<div id="info" style="overflow:hidden; height:300px;">
<div id="b1">
<ul><li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
<li>aaaaaaaaaaaa</li>
</ul>
</div>
<div id="bgun"></div>
</div>
<script language="javascript">
var speed=30
bgun.innerHTML=b1.innerHTML
function Marquee(){
if(bgun.offsetTop-info.scrollTop<=0)
info.scrollTop-=b1.offsetHeight
else{
info.scrollTop++
}}
var MyMar=setInterval(Marquee,speed)
info.onmouseover=function() {clearInterval(MyMar)}
info.onmouseout=function() {MyMar=setInterval(Marquee,speed)}</script>
</div>