由于四象限中可能会有很多任务，可能会超出象限大小，所以需要加上滚动条。

一般是：overflow:auto这个属性;

同时简单介绍几种HTML滚动条代码：

1、向右滚动代码：

<div id="colee_right" style="overflow:hidden;width:760px;">

<table cellpadding="0" cellspacing="0" border="0">

<tr><td id="colee_right1" valign="top" align="center">

<table width="100%" border="0" cellspacing="0" cellpadding="0">

<tr>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

</tr>

</table>

</td>

<td id="colee_right2" valign="top"></td>

</tr>

</table>

</div>

<script>

var speed=30//速度数值越大速度越慢

//var colee_right2=document.getElementByIdx_x_x("colee_right2");

//var colee_right1=document.getElementByIdx_x_x("colee_right1");

//var colee_right=document.getElementByIdx_x_x("colee_right");

colee_right2.innerHTML=colee_right1.innerHTML

function Marquee4(){

if(colee_right.scrollLeft<=0)

colee_right.scrollLeft+=colee_right2.offsetWidth

else{

colee_right.scrollLeft--

}

}

var MyMar4=setInterval(Marquee4,speed)

colee_right.οnmοuseοver=function() {clearInterval(MyMar4)}

colee_right.οnmοuseοut=function() {MyMar4=setInterval(Marquee4,speed)}

</script>

<!--向右滚动代码结束-->

2、向左滚动代码：

<!--下面是向左滚动代码-->

<div id="colee_left" style="overflow:hidden; width:760px;">

<table cellpadding="0" cellspacing="0" border="0">

<tr><td id="colee_left1" valign="top" align="center">

<table cellpadding="2" cellspacing="0" border="0">

<tr align="center">

<td>

<table width="100%" border="0" cellspacing="0" cellpadding="0">

<tr>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

</tr>

</table>

</td>

</tr>

</table>

</td>

<td id="colee_left2" valign="top"></td>

</tr>

</table>

</div>

<script>

//使用div时，请保证colee_left2与colee_left1是在同一行上.

var speed=30//速度数值越大速度越慢

//var colee_left2=document.getElementByIdx_x("colee_left2");

//var colee_left1=document.getElementByIdx_x("colee_left1");

//var colee_left=document.getElementByIdx_x("colee_left");

colee_left2.innerHTML=colee_left1.innerHTML

function Marquee3(){

if(colee_left2.offsetWidth-colee_left.scrollLeft<=0)//offsetWidth 是对象的可见宽度

colee_left.scrollLeft-=colee_left1.offsetWidth//scrollWidth 是对象的实际内容的宽，不包边线宽度

else{

colee_left.scrollLeft++

}

}

var MyMar3=setInterval(Marquee3,speed)

colee_left.οnmοuseοver=function() {clearInterval(MyMar3)}

colee_left.οnmοuseοut=function() {MyMar3=setInterval(Marquee3,speed)}

</script>

<!--向左滚动代码结束-->

3、向上滚动代码：

<!--向上滚动代码开始-->

<div id="colee" style="overflow:hidden;height:400px;width:550px;">

<div id="colee1">

<table width="100%" border="0" cellspacing="0" cellpadding="0">

<tr>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

</tr>

</table>

</div>

<div id="colee2"></div>

</div>

<script>

var speed=30;

//var colee2=document.getElementByIdx_x("colee2");

//var colee1=document.getElementByIdx_x("colee1");

//var colee=document.getElementByIdx_x("colee");

colee2.innerHTML=colee1.innerHTML; //克隆colee1为colee2

function Marquee1(){

//当滚动至colee1与colee2交界时

if(colee2.offsetTop-colee.scrollTop<=0){

colee.scrollTop-=colee1.offsetHeight; //colee跳到最顶端

}else{

colee.scrollTop++

}

}

var MyMar1=setInterval(Marquee1,speed)//设置定时器

//鼠标移上时清除定时器达到滚动停止的目的

colee.οnmοuseοver=function() {clearInterval(MyMar1)}

//鼠标移开时重设定时器

colee.οnmοuseοut=function(){MyMar1=setInterval(Marquee1,speed)}

</script>

<!--向上滚动代码结束-->

4、向下滚动代码：

<div id="colee_bottom" style="overflow:hidden;height:253px;width:410px;">

<div id="colee_bottom1">

<table width="100%" border="0" cellspacing="0" cellpadding="0">

<tr>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

<td style="padding-left:10px;"><img src="aa.jpg" /></td>

</tr>

</table>

</div>

<div id="colee_bottom2"></div>

</div>

<script>

var speed=30

var colee_bottom2=document.getElementByIdx_x("colee_bottom2");

var colee_bottom1=document.getElementByIdx_x("colee_bottom1");

var colee_bottom=document.getElementByIdx_x("colee_bottom");

colee_bottom2.innerHTML=colee_bottom1.innerHTML

colee_bottom.scrollTop=colee_bottom.scrollHeight

function Marquee2(){

if(colee_bottom1.offsetTop-colee_bottom.scrollTop>=0)

colee_bottom.scrollTop+=colee_bottom2.offsetHeight

else{

colee_bottom.scrollTop--

}

}

var MyMar2=setInterval(Marquee2,speed)

colee_bottom.οnmοuseοver=function() {clearInterval(MyMar2)}

colee_bottom.οnmοuseοut=function() {MyMar2=setInterval(Marquee2,speed)}

</script>

同时注意还有其他滚动代码的分享：

一、向左滚动：<marquee scrollAmount="2" direction="left" width="滚动区域宽度" height="滚动区域高度" onMouseOver="stop()" onMouseOut="start()">这里放滚动的内容</marquee>

二、向上滚动：<marquee scrollAmount="2" direction="up" width="滚动区域宽度" height="滚动区域高度" onMouseOver="stop()" onMouseOut="start()">这里放滚动的内容</marquee>。