让你的文本链接渐隐渐显--javascript 特效

startColor = "#671700"; // 定义链接颜色
endColor = "#D8D1C5"; // 定义要渐变到最后的颜色

stepIn = 17;
stepOut = 23;

/*
定义是否让所有的文本链接自动渐变，true为是，false为否
*/
autoFade = true;

/*
在这里定义css样式里的类class：fade，如果为true，那么你要将要渐变的链接上加上此fade样式
*/
sloppyClass = false;

hexa = new makearray(16);
for(var i = 0; i < 10; i++)
hexa[i] = i;
hexa[10]="a"; hexa[11]="b"; hexa[12]="c";
hexa[13]="d"; hexa[14]="e"; hexa[15]="f";

document.onmouseover = domouseover;
document.onmouseout = domouseout;

startColor = dehexize(startColor.toLowerCase());
endColor = dehexize(endColor.toLowerCase());

var fadeId = new Array();

function dehexize(Color){
var colorArr = new makearray(3);
for (i=1; i<7; i++){
for (j=0; j<16; j++){
if (Color.charAt(i) == hexa[j]){
if (i%2 !=0)
colorArr[Math.floor((i-1)/2)]=eval(j)*16;
else
colorArr[Math.floor((i-1)/2)]+=eval(j);
}
}
}
return colorArr;
}

function domouseover() {
if(document.all){
var srcElement = event.srcElement;
if ((srcElement.tagName == "A" && autoFade) || srcElement.className == "fade" || (sloppyClass && srcElement.className.indexOf("fade") != -1))
fade(startColor‚endColor‚srcElement.uniqueID‚stepIn);
}
}

function domouseout() {
if (document.all){
var srcElement = event.srcElement;
if ((srcElement.tagName == "A" && autoFade) || srcElement.className == "fade" || (sloppyClass && srcElement.className.indexOf("fade") != -1))
fade(endColor‚startColor‚srcElement.uniqueID‚stepOut);
}
}

function makearray(n) {
this.length = n;
for(var i = 1; i <= n; i++)
this[i] = 0;
return this;
}

function hex(i) {
if (i < 0)
return "00";
else if (i > 255)
return "ff";
else
return "" + hexa[Math.floor(i/16)] + hexa[i%16];}

function setColor(r‚ g‚ b‚ element) {
var hr = hex(r); var hg = hex(g); var hb = hex(b);
element.style.color = "#"+hr+hg+hb;
}

function fade(s‚e‚ element‚step){
var sr = s[0]; var sg = s[1]; var sb = s[2];
var er = e[0]; var eg = e[1]; var eb = e[2];

if (fadeId[0] != null && fade[0] != element){
setColor(sr‚sg‚sb‚eval(fadeId[0]));
var i = 1;
while(i < fadeId.length){
clearTimeout(fadeId[i]);
i++;
}
}

for(var i = 0; i <= step; i++) {
fadeId[i+1] = setTimeout("setColor(Math.floor(" +sr+ " *(( " +step+ " - " +i+ " )/ " +step+ " ) + " +er+ " * (" +i+ "/" +
step+ "))‚Math.floor(" +sg+ " * (( " +step+ " - " +i+ " )/ " +step+ " ) + " +eg+ " * (" +i+ "/" +step+
"))‚Math.floor(" +sb+ " * ((" +step+ "-" +i+ ")/" +step+ ") + " +eb+ " * (" +i+ "/" +step+ "))‚"+element+");"‚i*step);
}
fadeId[0] = element;
}

</script>