彩虹特效 近来在网上见到一个非常棒的javascrip特效，用来创建彩虹字，其效果完全
可以和javaapplet媲美，而且解释速度更快，我将源代码附录在下面： <html> <head> <ti
tle>用javascrip创建的彩虹字</title> <META HTTP-EQUIV="Content-Type" CONTENT="tex
t/html; CHARSET=gb2312"> <script language="JavaScript"> <!-- Hide the script fro
m old browsers --
// Michael P. Scholtis (mpscho@planetx.bloomu.edu) // All rights reserved. Janu
ary 15, 1996 // You may use this JavaScript example as you see fit, as long as t
he // information within this comment above is included in your script.
function MakeArray(n){ this.length=n; for(var i=1; i<=n; i++) this［i］=i-
1; return this }
function ToHex(x){ var high=x/16; // Changes a int to hex (in the range 0 to
255) var s=high+""; //1 s=s.substring(0,2); //2 the combination of these a
re the same as the trunc function high=parseInt(s,10); //3 var left=hex［h
igh+1］; // left part of the hex-value var low=x-high*16; // calculate the re
st of the values s=low+""; //1 s=s.substring(0,2); //2 the combination of
these are the same as the trunc function low=parseInt(s,10); //3 var right
=hex［low+1］; // right part of the hex-value var string=left+""+right; // ad
d the high and low together return string; }
function rainbow(text){ text=text.substring(3,text.length-4); // gets rid of
the HTML-comment-tags color_d1=255; // any value in begin 0 to 255 mul=c
olor_d1/text.length; for(i=0;i<text.length;i++){ color_d1=255*Math.sin(
i/(text.length/3)); // some other things you can try>> "=255-mul*i" to fade out,
//"=mul*i" to fade in, or try "255*Math.sin(i/(text.length/3))" color_h1=
ToHex(color_d1); color_d2=mul*i; color_h2=ToHex(color_d2); doc
ument.write("<FONT COLOR= #FF"+color_h1+color_h2+" > //"+text.substring(i,i+1)+
</FONT> ); } }