这是我第二次写了，上次提交的时候出错，都丢了。然后就被派去Microsoft学习了1周，现在刚回来。咬咬牙，换个姿势，再来一次。
某天，项目经理提了个需求，要我做一个在系统后台运行的一个消息提示的功能，当有新业务单未处理的时候，就在系统主页面的右上角滚动一段提示文字的链接。
当我写完后台代码后，为了实现滚动文字，第一个方案，如下：
demo1
<div id=base style="overflow:hidden;height:100;width:100;">
<div id=show1>
白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦
白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦
</div>
<div id=show2></div>
</div>
<script>
var speed=50;
show2.innerHTML=show1.innerHTML;
function msg()
{
if(show2.offsetTop-base.scrollTop<=0)
base.scrollTop-=show1.offsetHeight;
else
base.scrollTop++;
}
var show=setInterval(msg,speed);
base.onmouseover=function(){clearInterval(show)};
base.onmouseout=function(){show=setInterval(msg,speed)};
</script>
但是发现，这个巨不好用。缺点：1、当文字过少，面积比Div_base小的时候就不滚动（不适合单条消息类的滚动，但是可以满足当内容超出容器时候的滚动的需求）；2、为了实现不间断的滚动，内容被复制了1份；3、不兼容除IE外的浏览器。
demo2
<html>
<head>
<title>修改版（原文件来自赛迪网）</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<script language=JavaScript>
var messages=new Array()
messages[0]="<a href='http://www.google.com'>白日梦之流口水</a>"
messages[1]="<a href='http://www.google.com'>白日梦之说梦话</a>"
messages[2]="<a href='http://www.google.com'>白日梦之夜梦游</a>"
messages[3]="<a href='http://www.google.com'>白日梦之鼾声不断</a>"
messages[4]="<a href='http://www.google.com'>白日梦之尿地图</a>"
messages[5]="<a href='http://www.google.com'>白日梦之惊声尖啸</a>"
var scrollerwidth=320
var scrollerheight=100
var scrollerbgcolor='#FFFFFF'
if (messages.length>1)
i=2
else
i=0
function move1(whichlayer){
tlayer=eval(whichlayer)
if (tlayer.top>0&&tlayer.top<=5){
tlayer.top=0
setTimeout("move1(tlayer)",3000)
setTimeout("move2(document.main.document.second)",3000)
return}
if (tlayer.top>=tlayer.document.height*-1){
tlayer.top-=5
setTimeout("move1(tlayer)",100)}
else{
tlayer.top=scrollerheight
tlayer.document.write(messages[i])
tlayer.document.close()
if (i==messages.length-1)
i=0
else
i++}}
function move2(whichlayer){
tlayer2=eval(whichlayer)
if (tlayer2.top>0&&tlayer2.top<=5){
tlayer2.top=0
setTimeout("move2(tlayer2)",3000)
setTimeout("move1(document.main.document.first)",3000)
return}
if (tlayer2.top>=tlayer2.document.height*-1){
tlayer2.top-=5
setTimeout("move2(tlayer2)",100)}
else{
tlayer2.top=scrollerheight
tlayer2.document.write(messages[i])
tlayer2.document.close()
if (i==messages.length-1)
i=0
else
i++}}
function move3(whichdiv){
tdiv=eval(whichdiv)
if (tdiv.style.pixelTop>0&&tdiv.style.pixelTop<=5){
tdiv.style.pixelTop=0
setTimeout("move3(tdiv)",3000)
setTimeout("move4(second2)",3000)
return}
if (tdiv.style.pixelTop>=tdiv.offsetHeight*-1){
tdiv.style.pixelTop-=5
setTimeout("move3(tdiv)",100)}
else{
tdiv.style.pixelTop=scrollerheight
tdiv.innerHTML=messages[i]
if (i==messages.length-1)
i=0
else
i++}}
function move4(whichdiv){
tdiv2=eval(whichdiv)
if (tdiv2.style.pixelTop>0&&tdiv2.style.pixelTop<=5){
tdiv2.style.pixelTop=0
setTimeout("move4(tdiv2)",3000)
setTimeout("move3(first2)",3000)
return}
if (tdiv2.style.pixelTop>=tdiv2.offsetHeight*-1){
tdiv2.style.pixelTop-=5
setTimeout("move4(second2)",100)}
else{
tdiv2.style.pixelTop=scrollerheight
tdiv2.innerHTML=messages[i]
if (i==messages.length-1)
i=0
else
i++}}
function startscroll(){
if (document.all){
move3(first2)
second2.style.top=scrollerheight}
else if (document.layers){
move1(document.main.document.first)
document.main.document.second.top=scrollerheight+5
document.main.document.second.visibility='show'}}
window.onload=startscroll
</script>
<ilayer id="main" width=&{scrollerwidth}; height=&{scrollerheight}; bgcolor=&{scrollerbgcolor};>
<layer id="first" left=0 top=1 width=&{scrollerwidth};>
<script language="JavaScript1.2">
if (document.layers)
document.write(messages[0])
</script>
</layer>
<layer id="second" left=0 top=0 width=&{scrollerwidth}; visibility=hide>
<script language="JavaScript1.2">
if (document.layers)
document.write(messages[1])
</script>
</layer>
</ilayer>
<script language="JavaScript1.2">
if (document.all){
document.writeln('<span id="main2" style="position:relative;width:'+scrollerwidth+';height:'+scrollerheight+';overflow:hiden;background-color:'+scrollerbgcolor+'">')
document.writeln('<div style="position:absolute;width:'+scrollerwidth+';height:'+scrollerheight+';clip:rect(0 '+scrollerwidth+' '+scrollerheight+' 0);left:0;top:0">')
document.writeln('<div id="first2" style="position:absolute;width:'+scrollerwidth+';left:0;top:1;">')
document.write(messages[0])
document.writeln('</div>')
document.writeln('<div id="second2" style="position:absolute;width:'+scrollerwidth+';left:0;top:0">')
document.write(messages[1])
document.writeln('</div>')
document.writeln('</div>')
document.writeln('</span>')
}
</script>
</body>
</html>
demo2缺点：代码量太大，过于复杂。
demo3
<div style="width:200px;overflow:hidden">
<div style="position:relative;top:0px;left:0px;white-space:nowrap" id=news>
<span id=nbo>白日梦1白日梦2白日梦3白日梦4白日梦5白日梦6白日梦7</span>
<script language=javascript>
document.write(nbo.innerHTML);
</script>
</div>
</div>
<script language=javascript>
function newsScroll()
{
news.style.pixelLeft=(news.style.pixelLeft-1)%nbo.offsetWidth;
}
timer1=setInterval('newsScroll()',50)
</script>
demo3缺点和demo1一样。
demo4
<script language="JavaScript">
<!--
if (document.all){
msg="我爱你Daydream我爱你Daydream我爱你Daydream";
msgColor="0000ff";
msgFont="Verdana";
msg=msg.split('');
n=msg.length;
e=360/n;
yp=0;
xp=0;
yb=40;
xb=60;
sa=0.07;
sb=0;
pa=new Array();
pb=new Array();
for (i=0; i < n; i++)
{
document.write('<div id="msgshow" style="position:absolute;top:0;left:0;'+'height:30;width:30;font-family:'+msgFont+';text-align:center;color:'+msgColor+'">'+msg[i]+'</div>');
}
function ani(){
yp=document.body.scrollTop+50;
xp=document.body.scrollLeft+window.document.body.clientWidth-100;
for (i=0; i < n; i++){
msgshow[i].style.top =yp+yb*Math.sin(sb+i*e*Math.PI/180);
msgshow[i].style.left=xp+xb*Math.cos(sb+i*e*Math.PI/180);
pb[i]=msgshow[i].style.pixelTop-yp;
pa[i]=pb[i]-pb[i]*2;
if (pa[i] < 1){
pa[i]=0;
msgshow[i].style.visibility='hidden';
}
else msgshow[i].style.visibility='visible';
msgshow[i].style.fontSize=pa[i]/2.7;
}
sb-=sa;
setTimeout('ani()',100);
}
window.onload=ani;
}
// -->
</script>
demo4的效果相当漂亮。 页面右上角就是这个效果。
demo5
<div class="top_t">
<marquee id="msg" direction="up" onMouseOut="this.start()" onMouseOver="this.stop()" scrollamount="1" scrolldelay="0" width="100%" height="50">
<a href="#">白日梦</a>
<br><input type="button" value="Reload" />
</marquee>
</div>
demo5，是我最后采用的方案。好处不言而喻，代码简单，功能强大，图片、按钮、表格等放到里面都可以滚动。缺点也是不支持IE以外的浏览器。
某天，项目经理提了个需求，要我做一个在系统后台运行的一个消息提示的功能，当有新业务单未处理的时候，就在系统主页面的右上角滚动一段提示文字的链接。
当我写完后台代码后，为了实现滚动文字，第一个方案，如下：
demo1<div id=base style="overflow:hidden;height:100;width:100;"><div id=show1>白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦白日梦</div><div id=show2></div></div><script>var speed=50;show2.innerHTML=show1.innerHTML;function msg(){ if(show2.offsetTop-base.scrollTop<=0) base.scrollTop-=show1.offsetHeight; else base.scrollTop++;}var show=setInterval(msg,speed);base.onmouseover=function(){clearInterval(show)};base.onmouseout=function(){show=setInterval(msg,speed)};</script>demo2<html><head><title>修改版（原文件来自赛迪网）</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head><body bgcolor="#FFFFFF" text="#000000"><script language=JavaScript>var messages=new Array()messages[0]="<a href='http://www.google.com'>白日梦之流口水</a>"messages[1]="<a href='http://www.google.com'>白日梦之说梦话</a>"messages[2]="<a href='http://www.google.com'>白日梦之夜梦游</a>"messages[3]="<a href='http://www.google.com'>白日梦之鼾声不断</a>"messages[4]="<a href='http://www.google.com'>白日梦之尿地图</a>"messages[5]="<a href='http://www.google.com'>白日梦之惊声尖啸</a>"var scrollerwidth=320var scrollerheight=100var scrollerbgcolor='#FFFFFF'if (messages.length>1)i=2elsei=0function move1(whichlayer){tlayer=eval(whichlayer)if (tlayer.top>0&&tlayer.top<=5){tlayer.top=0setTimeout("move1(tlayer)",3000)setTimeout("move2(document.main.document.second)",3000)return}if (tlayer.top>=tlayer.document.height*-1){tlayer.top-=5setTimeout("move1(tlayer)",100)}else{tlayer.top=scrollerheighttlayer.document.write(messages[i])tlayer.document.close()if (i==messages.length-1)i=0elsei++}}function move2(whichlayer){tlayer2=eval(whichlayer)if (tlayer2.top>0&&tlayer2.top<=5){tlayer2.top=0setTimeout("move2(tlayer2)",3000)setTimeout("move1(document.main.document.first)",3000)return}if (tlayer2.top>=tlayer2.document.height*-1){tlayer2.top-=5setTimeout("move2(tlayer2)",100)}else{tlayer2.top=scrollerheighttlayer2.document.write(messages[i])tlayer2.document.close()if (i==messages.length-1)i=0elsei++}}function move3(whichdiv){tdiv=eval(whichdiv)if (tdiv.style.pixelTop>0&&tdiv.style.pixelTop<=5){tdiv.style.pixelTop=0setTimeout("move3(tdiv)",3000)setTimeout("move4(second2)",3000)return}if (tdiv.style.pixelTop>=tdiv.offsetHeight*-1){tdiv.style.pixelTop-=5setTimeout("move3(tdiv)",100)}else{tdiv.style.pixelTop=scrollerheighttdiv.innerHTML=messages[i]if (i==messages.length-1)i=0elsei++}}function move4(whichdiv){tdiv2=eval(whichdiv)if (tdiv2.style.pixelTop>0&&tdiv2.style.pixelTop<=5){tdiv2.style.pixelTop=0setTimeout("move4(tdiv2)",3000)setTimeout("move3(first2)",3000)return}if (tdiv2.style.pixelTop>=tdiv2.offsetHeight*-1){tdiv2.style.pixelTop-=5setTimeout("move4(second2)",100)}else{tdiv2.style.pixelTop=scrollerheighttdiv2.innerHTML=messages[i]if (i==messages.length-1)i=0elsei++}}function startscroll(){if (document.all){move3(first2)second2.style.top=scrollerheight}else if (document.layers){move1(document.main.document.first)document.main.document.second.top=scrollerheight+5document.main.document.second.visibility='show'}}window.onload=startscroll</script> <ilayer id="main" width=&{scrollerwidth}; height=&{scrollerheight}; bgcolor=&{scrollerbgcolor};> <layer id="first" left=0 top=1 width=&{scrollerwidth};> <script language="JavaScript1.2">if (document.layers)document.write(messages[0])</script> </layer> <layer id="second" left=0 top=0 width=&{scrollerwidth}; visibility=hide> <script language="JavaScript1.2">if (document.layers)document.write(messages[1])</script> </layer> </ilayer><script language="JavaScript1.2">if (document.all){document.writeln('<span id="main2" style="position:relative;width:'+scrollerwidth+';height:'+scrollerheight+';overflow:hiden;background-color:'+scrollerbgcolor+'">')document.writeln('<div style="position:absolute;width:'+scrollerwidth+';height:'+scrollerheight+';clip:rect(0 '+scrollerwidth+' '+scrollerheight+' 0);left:0;top:0">')document.writeln('<div id="first2" style="position:absolute;width:'+scrollerwidth+';left:0;top:1;">')document.write(messages[0])document.writeln('</div>')document.writeln('<div id="second2" style="position:absolute;width:'+scrollerwidth+';left:0;top:0">')document.write(messages[1])document.writeln('</div>')document.writeln('</div>')document.writeln('</span>')}</script></body></html>demo3<div style="width:200px;overflow:hidden"><div style="position:relative;top:0px;left:0px;white-space:nowrap" id=news><span id=nbo>白日梦1白日梦2白日梦3白日梦4白日梦5白日梦6白日梦7</span><script language=javascript>document.write(nbo.innerHTML);</script></div></div><script language=javascript>function newsScroll(){ news.style.pixelLeft=(news.style.pixelLeft-1)%nbo.offsetWidth;}timer1=setInterval('newsScroll()',50)</script>demo4<script language="JavaScript"><!-- if (document.all){msg="我爱你Daydream我爱你Daydream我爱你Daydream";msgColor="0000ff";msgFont="Verdana";msg=msg.split('');n=msg.length; e=360/n;yp=0;xp=0;yb=40;xb=60;sa=0.07;sb=0;pa=new Array();pb=new Array();for (i=0; i < n; i++){document.write('<div id="msgshow" style="position:absolute;top:0;left:0;'+'height:30;width:30;font-family:'+msgFont+';text-align:center;color:'+msgColor+'">'+msg[i]+'</div>');}function ani(){yp=document.body.scrollTop+50;xp=document.body.scrollLeft+window.document.body.clientWidth-100;for (i=0; i < n; i++){msgshow[i].style.top =yp+yb*Math.sin(sb+i*e*Math.PI/180);msgshow[i].style.left=xp+xb*Math.cos(sb+i*e*Math.PI/180);pb[i]=msgshow[i].style.pixelTop-yp;pa[i]=pb[i]-pb[i]*2;if (pa[i] < 1){pa[i]=0;msgshow[i].style.visibility='hidden';}else msgshow[i].style.visibility='visible';msgshow[i].style.fontSize=pa[i]/2.7;}sb-=sa;setTimeout('ani()',100);}window.onload=ani;}// --></script>demo5<div class="top_t"><marquee id="msg" direction="up" onMouseOut="this.start()" onMouseOver="this.stop()" scrollamount="1" scrolldelay="0" width="100%" height="50"><a href="#">白日梦</a><br><input type="button" value="Reload" /></marquee></div>
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