自定义 alt 文字提示样式

<span alt="好孩子^O^">过来</span><br><br>
<span alt="好孩子^O^" altbg="red" altcolor=yellow altborder="yellow">过来</span><br><br>
<span alt="好孩子^O^" altbg="#F7F7F7" altcolor="#999999" altborder="#CCCCCC">过来</span><br><br>
<span alt="好孩子^O^" altbg="green" altcolor=yellow altborder="darkgreen">过来</span><br><br>
<span alt="好孩子^O^" altbg="#000000" altcolor="#FFFFFF" altborder="#000000">过来</span>
<div style="display:none;border:1px solid #000000;background-color:#FFFFCC;font-size:12px;position:absolute;padding:2;" id=altlayer></div>
<script>
document.body.onmousemove=quickalt;
document.body.onmouseover=getalt;
document.body.onmouseout=restorealt;
var tempalt='';

function getalt()
{
if(event.srcElement.alt && (event.srcElement.alt!='' || (event.srcElement.alt=='' && tempalt!='')))
{
   altlayer.style.left=event.x;
   altlayer.style.top=event.y+20;
   altlayer.style.display='';
   tempalt=event.srcElement.alt;
   tempbg=event.srcElement.altbg;
   tempcolor=event.srcElement.altcolor;
   tempborder=event.srcElement.altborder;
   event.srcElement.alt='';
   altlayer.innerText=tempalt;
   if (typeof(tempbg)!="undefined"){altlayer.style.background=tempbg}else{altlayer.style.background="#FFFFCC"}
   if (typeof(tempcolor)!="undefined"){altlayer.style.color=tempcolor}else{altlayer.style.color=tempcolor="#000000"}
   if (typeof(tempborder)!="undefined"){altlayer.style.border='1px solid '+tempborder;}else{altlayer.style.border='1px solid #000000';}
}
}
function quickalt()
{
if(altlayer.style.display=='')
{
   altlayer.style.left=event.x;
   altlayer.style.top=event.y+10;
}
}

function restorealt()
{
event.srcElement.alt=tempalt;
tempalt='';
altlayer.style.display='none';
}
</script>