颜色选色程序

下面为效果显示

脚本说明:
把如下代码加入<body>区域中
<input id=kkk1 style=position:absolute;left:0;top:0>
<input id=kkk2 style=position:absolute;left:200;top:0>
<input id=kkk3 style=position:absolute;left:400;top:0>
<input id=kkk4 style=position:absolute;left:600;top:0>
<div id=RainBowDiv style='position:absolute;left:200;top:30;'></div>
<script>
var iW = '70';//共有6种颜色，每种颜色的宽为iW。iW*6为色带的宽。
var iH = '400';//iH为色带的高。
//计算HSV颜色代码。
function HSV(){
kkk1.value = 'X:'+event.offsetX+'   Y:'+event.offsetY;
var H,S,V;
var pY = event.offsetY;
if(pY == 0){H = S = 0; V = 100;}
else{
 if(pY == iH-1) H = S = V = 0;
 else{
  H = Math.floor(360*event.offsetX/(iW*6));
  S = Math.round(50*(iH-pY)/(iH/2));
  V = Math.round(100-50*pY/iH);
  }
 }
kkk2.value='HSV('+H+','+S+'%,'+V+'%)';
HSVtoRGB(H,S/100,V/100);
}

//计算RGB颜色代码。
function HSVtoRGB(h,s,v){
var i, f ,p1 ,p2 ,p3;
var r = g = b = 0;
if(s < 0) s=0;
if(s > 1) s=1;
if(v < 0) v=0;
if(v > 1) v=1;
h %= 360;
if(h < 0) h+=360;
h /= 60;
i = Math.floor(h);
f = h-i;
p1 = v*(1-s);
p2 = v*(1-s*f);
p3 = v*(1-s*(1-f));
if(i == 0){r=v; g=p3; b=p1;}
else if(i == 1){r=p2; g=v; b=p1;}
else if(i == 2){r=p1; g=v; b=p3;}
else if(i == 3){r=p1; g=p2; b=v;}
else if(i == 4){r=p3; g=p1; b=v;}
else if(i == 5){r=v; g=p1; b=p2;}
kkk3.value='RGB('+Math.round(r*255)+','+Math.round(g*255)+','+Math.round(b*255)+')';
RGBtoHTML(Math.round(r*255),Math.round(g*255),Math.round(b*255))
}

//计算HTML颜色代码。
function RGBtoHTML(r,g,b){
r=(r>=16)?r.toString(16):('0'+r.toString(16))
g=(g>=16)?g.toString(16):('0'+g.toString(16))
b=(b>=16)?b.toString(16):('0'+b.toString(16))
kkk4.value='HTML #'+r+g+b;
}
/*
Dewin 写于 2002-08-17 10:37
*/
function window.onload(){
var RainBow = new Array(255,0,0,  255,255,0,  0,255,0,  0,255,255,  0,0,255,  255,0,255,  255,0,0);
for(var i=0;i<6;i++){
 var R1 = RainBow[i*3];
 var G1 = RainBow[i*3+1];
 var B1 = RainBow[i*3+2];
 var R2 = RainBow[(i+1)*3];
 var G2 = RainBow[(i+1)*3+1];
 var B2 = RainBow[(i+1)*3+2];
 RainBowDiv.innerHTML += "<div style='position:absolute;left:"+i*iW+";top:0;width:"+iW+";height:"+iH+";background:rgb("+R1+","+G1+","+B1+");'></div><div style='position:absolute;left:"+i*iW+";top:0;width:"+iW+";height:"+iH+";background:rgb("+R2+","+G2+","+B2+");filter:alpha(opacity=0,finishopacity=100,Style=1);'></div>"
 }
RainBowDiv.innerHTML += "<div style=position:absolute;left:0;top:0;width:"+6*iW+";height:"+iH+";background:rgb(128,128,128);filter:alpha(opacity=0,finishOpacity=100,style=1,starty=0,finishy=100,startx=0,finishx=0)></div><div style='position:absolute;left:0;top:0;width:"+(6*iW+1)+";height:"+iH+";' onmousemove=HSV()></div>"
}
</script>