关于全局变量...

<body>
aa = ""
function f1()
{
aa=1
}
function f2()
{
aa = 2
}
</body>

解决方案 »

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前面若不加var，即便在函数体里面用也被看做全局变量
<html>
<head>
<script>
function foo0(strID){
var nColumn = 4;
for(var i=0;i<nColumn;i++)
window.document.all(strID + i).color = "yellow";
}
function foo1(strID,strColor){
var nColumn = 4;
for(var i=0;i<nColumn;i++)
window.document.all(strID + i).color = strColor;
}
</script>
</head><body><table border="1" width="100%" >
  <tr id="aa" onMouseOver="foo0('aa')" onMouseOut="foo1('aa','red')">
    <td width="25%"><font id=aa0 color=red>aaaa</font></td>
    <td width="25%"><font id=aa1 color=red>bbbb</font></td>
    <td width="25%"><font id=aa2 color=red>cccc</font></td>
    <td width="25%"><font id=aa3 color=red>dddd</font></td>
  </tr>
  <tr id="aa" onMouseOver="foo0('bb')" onMouseOut="foo1('bb','blue')">
    <td width="25%"><font id=bb0 color=blue>eeee</font></td>
    <td width="25%"><font id=bb1 color=blue>ffff</font></td>
    <td width="25%"><font id=bb2 color=blue>gggg</font></td>
    <td width="25%"><font id=bb3 color=blue>hhhh</font></td>
  </tr>
  <tr id="aa" onMouseOver="foo0('cc')" onMouseOut="foo1('cc','red')">
    <td width="25%"><font id=cc0 color=red>iiii</font></td>
    <td width="25%"><font id=cc1 color=red>jjjj</font></td>
    <td width="25%"><font id=cc2 color=red>kkkk</font></td>
    <td width="25%"><font id=cc3 color=red>llll</font></td>
  </tr>
</table>
</body>
</html>
to zhfkiller(杀手) 谢谢您的关注！能否不用给元素指定ID，而且是改变bgcolor
没有按你的颜色来调，不过你改一下就行啦。。<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
<script language="JavaScript">
function changecolor()
{
this.style.backgroundColor="#ffffff";
    //var oldHandler=t.on
}

function restorecolor()
{
  var a=this.rowIndex;
      a%2==0?document.all.tab1.rows[a].style.backgroundColor="#cccccc":document.all.tab1.rows[a].style.backgroundColor="#dddddd"
}
</script>
</head>
<body>
<table width="100%" border="1" id="tab1">
  <tr>
    <td>1</td>
  </tr>
  <tr>
    <td>2</td>
  </tr>
  <tr>
    <td>3</td>
  </tr>
  <tr>
    <td>4</td>
  </tr>
  <tr>
    <td>5</td>
  </tr>
  <tr>
    <td>6</td>
  </tr>
  <tr>
    <td>7</td>
  </tr>
  <tr>
    <td>8</td>
  </tr>
  <tr>
    <td>9</td>
  </tr>
  <tr>
    <td>10</td>
  </tr>
</table>
<script language="JavaScript">
for (var i=0;i<document.all.tab1.rows.length;i++)
{
i%2==0?document.all.tab1.rows[i].style.backgroundColor="#cccccc":document.all.tab1.rows[i].style.backgroundColor="#dddddd"
    document.all.tab1.rows[i].onmouseover=changecolor;
document.all.tab1.rows[i].onmouseout=restorecolor;
}
</script>
</body>
</html>
//如果表格中的行(row)有HTML性质设置的oumouseover、onmouseout事件，则用下面的程序会把HTML性质设置的替代掉，下面的是加入解决该问题的代码。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
<script language="JavaScript">
function addoldfunction1()
{
var oldhandler=this.onmouseover;
this.onmouseover=function(){oldhandler();changecolor(this);}
}

function addoldfunction2()
{
var oldhandler=this.onmouseout;
this.onmouseout=function(){oldhandler();restorecolor(this);}
}

function changecolor(t)
{
t.style.backgroundColor="#ffffff";//改为白色
}

function restorecolor(t)
{
  var a=t.rowIndex;
      a%2==0?document.all.tab1.rows[a].style.backgroundColor="#cccccc":document.all.tab1.rows[a].style.backgroundColor="#dddddd"
}
</script>
</head>
<body>
<table width="100%" border="1" id="tab1">
  <tr>
    <td>1</td>
  </tr>
  <tr>
    <td>2</td>
  </tr>
  <tr>
    <td>3</td>
  </tr>
  <tr>
    <td>4</td>
  </tr>
  <tr>
    <td>5</td>
  </tr>
  <tr>
    <td>6</td>
  </tr>
  <tr onm>
    <td>7</td>
  </tr>
  <tr>
    <td>8</td>
  </tr>
  <tr>
    <td>9</td>
  </tr>
  <tr>
    <td>10</td>
  </tr>
</table>
<script language="JavaScript">
for (var i=0;i<document.all.tab1.rows.length;i++)
{
i%2==0?document.all.tab1.rows[i].style.backgroundColor="#cccccc":document.all.tab1.rows[i].style.backgroundColor="#dddddd"
    document.all.tab1.rows[i].onmouseover=addoldfunction1;
document.all.tab1.rows[i].onmouseout=addoldfunction2;
}
</script>
</body>
</html>