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效果预览
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>网页特效|Linkweb.cn/Js|---一种色带制作方法</title>
</head>
<body>
<input id='Info1'><br>
<input id='Info2'><br>
<input id='Info3'><br>
<span id=ColorDiv style='width:200;height:200;'></span>
<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。
var H,S,V;
function HSV(){
var pX = event.offsetX;
var pY = event.offsetY;
var HalfH = parseInt(iH/2);
H = parseInt(pX*360/(iW*6));
if(event.offsetY < HalfH){
S = pY/HalfH;
V = 1;
}
else{
S = 1;
V = (iH-pY)/HalfH;
}
Info1.value = 'H:'+H+' S:'+parseInt(S*100)+'% V:'+parseInt(V*100)+'%';
HSVtoRGB();
RGBtoHTML();
}
var R,G,B;
function HSVtoRGB(){
var r,g,b;
var k = (H%60)/60;
var c1 = V*(1-S);
var c2 = V*(1-S*k);
var c3 = V*(1-S*(1-k));
switch(parseInt(H/60)){
case 0 : r=V,g=c3;b=c1; break;
case 1 : r=c2,g=V;b=c1; break;
case 2 : r=c1,g=V;b=c3; break;
case 3 : r=c1,g=c2;b=V; break;
case 4 : r=c3,g=c1;b=V; break;
case 5 : r=V,g=c1;b=c2; break;
}
R = parseInt(r*255);
G = parseInt(g*255);
B = parseInt(b*255);
Info2.value = 'R:'+R+' G:'+G+' B:'+B;
}
function RGBtoHTML(){
var r=(R>=16)?R.toString(16):('0'+R.toString(16));
var g=(G>=16)?G.toString(16):('0'+G.toString(16));
var b=(B>=16)?B.toString(16):('0'+B.toString(16));
var rgb=r+g+b;
Info3.value='HTML #'+rgb.toUpperCase();
ColorDiv.style.background = '#'+rgb;
}
function window.onload(){
var iHtml = '';
var iL = (document.body.offsetWidth-6*iW)/2;
var iT = (document.body.offsetHeight-iH)/2;
var RainBow = [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];
iHtml += "<span style='position:absolute;left:"+(i*iW+iL)+";top:"+iT+";width:"+iW+";height:"+iH+";background:rgb("+R1+","+G1+","+B1+");'></span><span style='position:absolute;left:"+(i*iW+iL)+";top:"+iT+";width:"+iW+";height:"+iH+";background:rgb("+R2+","+G2+","+B2+");filter:alpha(opacity=0,finishopacity=100,Style=1);'></span>"
}
iHtml += "<span style=position:absolute;left:"+iL+";top:"+iT+";width:"+iW*6+";height:"+iH/2+";background:rgb(255,255,255);filter:alpha(opacity=100,finishOpacity=0,style=1,starty=0,finishy=100,startx=0,finishx=0)></span><span style=position:absolute;left:"+iL+";top:"+(iT+iH/2)+";width:"+iW*6+";height:"+iH/2+";background:rgb(0,0,0);filter:alpha(opacity=0,finishOpacity=100,style=1,starty=0,finishy=100,startx=0,finishx=0)></span><span style='position:absolute;left:"+iL+";top:"+iT+";width:"+iW*6+";height:"+iH+";' onmousemove=HSV()></span>"
document.body.innerHTML += iHtml;
}
</script>
</body>
</html> |
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