深入浅析JavaScript中对事件的三种监听方式

<table>
<tr onmouseover='this.style.backgroundColor="red"' onmouseout='this.style.backgroundColor=""'><td>text1</td><td>text2</td></tr>
<tr onmouseover='this.style.backgroundColor="red"' onmouseout='this.style.backgroundColor=""'><td>text3</td><td>text4</td></tr>
<tr onmouseover='this.style.backgroundColor="red"' onmouseout='this.style.backgroundColor=""'><td>text5</td><td>text5</td></tr>
</table>

<table>
<tr><td>text1</td><td>text2</td></tr>
<tr><td>text3</td><td>text4</td></tr>
<tr><td>text5</td><td>text5</td></tr>
</table>
<script>
doms = document.getElementsByTagName('tr');
for(i=0;i<doms.length;i++)
{
  doms[i].onmouseover = function()
  {
    this.style.backgroundColor = "red";
  }
  doms[i].onmouseout = function()
  {
    this.style.backgroundColor = "";
  }
}
</script>

<table>
<tr><td>text1</td><td>text2</td></tr>
<tr><td>text3</td><td>text4</td></tr>
<tr><td>text5</td><td>text5</td></tr>
</table>
<script>
doms = document.getElementsByTagName('tr');
function show_color(where)
{
  this.tagName ? where = this : null
  where.style.backgroundColor = "red";
}
function hide_color(where)
{
  this.tagName ? where = this : null
  where.style.backgroundColor = "";
}
function for_ie(where,how)
{
  return function()
  {
    how(where);
  }  
}
for(i=0;i<doms.length;i++)
{
  try
  {
    doms[i].addEventListener('mouseover',show_color,false);
    doms[i].addEventListener('mouseout',hide_color,false);
  }
  catch(e)
  {
    doms[i].attachEvent('onmouseover',for_ie(doms[i],show_color));
    doms[i].attachEvent('onmouseout',for_ie(doms[i],hide_color));
  }
}
</script>