js实现可得到不同颜色值的颜色选择器实例_javascript技巧

本文实例讲述了js实现可得到不同颜色值的颜色选择器。分享给大家供大家参考。具体实现方法如下：

复制代码 代码如下:

<script><br> var iW = '70';//共有6种颜色，每种颜色的宽为iW。iW*6为色带的宽。<br> var iH = '400';//iH为色带的高。<br> //计算HSV颜色代码。<br> function HSV(){<br> kkk1.value = 'X:' event.offsetX '   Y:' event.offsetY;<br> var H,S,V;<br> var pY = event.offsetY;<br> if(pY == 0){H = S = 0; V = 100;}<br> else{<br>  if(pY == iH-1) H = S = V = 0;<br>  else{<br>   H = Math.floor(360*event.offsetX/(iW*6));<br>   S = Math.round(50*(iH-pY)/(iH/2));<br>   V = Math.round(100-50*pY/iH);<br>   }<br>  }<br> kkk2.value='HSV(' H ',' S '%,' V '%)';<br> HSVtoRGB(H,S/100,V/100);<br> } <p>//计算RGB颜色代码。<br> function HSVtoRGB(h,s,v){<br> var i, f ,p1 ,p2 ,p3;<br> var r = g = b = 0;<br> if(s < 0) s=0;<br /> if(s > 1) s=1;<br> if(v < 0) v=0;<br /> if(v > 1) v=1;<br> h %= 360;<br> if(h < 0) h =360;<br /> h /= 60;<br /> i = Math.floor(h);<br /> f = h-i;<br /> p1 = v*(1-s);<br /> p2 = v*(1-s*f);<br /> p3 = v*(1-s*(1-f));<br /> if(i == 0){r=v; g=p3; b=p1;}<br /> else if(i == 1){r=p2; g=v; b=p1;}<br /> else if(i == 2){r=p1; g=v; b=p3;}<br /> else if(i == 3){r=p1; g=p2; b=v;}<br /> else if(i == 4){r=p3; g=p1; b=v;}<br /> else if(i == 5){r=v; g=p1; b=p2;}<br /> kkk3.value='RGB(' Math.round(r*255) ',' Math.round(g*255) ',' Math.round(b*255) ')';<br /> RGBtoHTML(Math.round(r*255),Math.round(g*255),Math.round(b*255))<br /> }</p> <p>//计算HTML颜色代码。<br /> function RGBtoHTML(r,g,b){<br /> r=(r>=16)?r.toString(16):('0' r.toString(16))<br> g=(g>=16)?g.toString(16):('0' g.toString(16))<br> b=(b>=16)?b.toString(16):('0' b.toString(16))<br> kkk4.value='HTML #' r g b;<br> }</p> <p>function window.onload(){<br> 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);<br> for(var i=0;i<6;i ){<br />  var R1 = RainBow[i*3];<br />  var G1 = RainBow[i*3 1];<br />  var B1 = RainBow[i*3 2];<br />  var R2 = RainBow[(i 1)*3];<br />  var G2 = RainBow[(i 1)*3 1];<br />  var B2 = RainBow[(i 1)*3 2];<br />  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>"<br>  }<br> 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>"<br> }<br> </script>

更多js颜色操作可参考本站颜色工具：

RGB颜色编码生成器

在线网页配色工具

RGB颜色查询对照表_颜色代码表_颜色的英文名称大全

希望本文所述对大家的javascript程序设计有所帮助。