有的站点超链接鼠标移上去时有彩色闪烁效果，其实很简单就是调用了一段js代码而已。
下面就是实现效果所需代码：
<script language="javascript">

var rate = 30;
var object;
var act = 0;
var elmh = 0;
var elms = 128;
var elmv = 255;
var clrorg;
var timerid;

if (navigator.appname.indexof("microsoft",0) != -1 && parseint(navigator.appversion) >= 4) {
browser = true;
} else {
browser = false;
}

function dorainbow()
{
if (browser && act != 1) {
act = 1;
object = event.srcelement;
clrorg = object.style.color;
timerid = setinterval("changecolor()",100);
}
}
function stoprainbow()
{
if (browser && act != 0) {
object.style.color = clrorg;
clearinterval(timerid);
act = 0;
}
}
function dorainbowanchor()
{
if (browser && act != 1) {
object = event.srcelement;
while (object.tagname != 'a' && object.tagname != 'body') {
object = object.parentelement;
if (object.tagname == 'a' || object.tagname == 'body')
break;
}
if (object.tagname == 'a' && object.href != '') {
act = 1;
clrorg = object.style.color;
timerid = setinterval("changecolor()",100);
}
}
}
function stoprainbowanchor()
{
if (browser && act != 0) {
if (object.tagname == 'a') {
object.style.color = clrorg;
clearinterval(timerid);
act = 0;
}
}
}
function changecolor()
{
object.style.color = makecolor();
}
function makecolor()
{
if (elms == 0) {
elmr = elmv; elmg = elmv; elmb = elmv;
}
else {
t1 = elmv;
t2 = (255 - elms) * elmv / 255;
t3 = elmh % 60;
t3 = (t1 - t2) * t3 / 60;

if (elmh < 60) {
elmr = t1; elmb = t2; elmg = t2 + t3;
}
else if (elmh < 120) {
elmg = t1; elmb = t2; elmr = t1 - t3;
}
else if (elmh < 180) {
elmg = t1; elmr = t2; elmb = t2 + t3;
}
else if (elmh < 240) {
elmb = t1; elmr = t2; elmg = t1 - t3;
}
else if (elmh < 300) {
elmb = t1; elmg = t2; elmr = t2 + t3;
}
else if (elmh < 360) {
elmr = t1; elmg = t2; elmb = t1 - t3;
}
else {
elmr = 0; elmg = 0; elmb = 0;
}
}
elmr = math.floor(elmr);
elmg = math.floor(elmg);
elmb = math.floor(elmb);
clrrgb = '#' + elmr.tostring(16) + elmg.tostring(16) + elmb.tostring(16);
elmh = elmh + rate;
if (elmh >= 360)
elmh = 0;
return clrrgb;
}
document.onmouseover = dorainbowanchor;
document.onmouseout = stoprainbowanchor;
</script>
把上面的代码另存为一个js文件，然后在想实现此效果的页面调用即可！