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文本链接渐隐渐显

关键词：js,链接,特效时间:2008年11月22日星期六阅读:63

<BODY>
<script language="javascript" type="text/javascript">
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>
</BODY>
<A HREF="#">老黑的演示效果</A>

提示：可以先修改部分代码后再运行

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