JS实现的RGB网页颜色在线取色器完整实例

本文实例讲述了JS实现的RGB网页颜色在线取色器。分享给大家供大家参考，具体如下：

运行效果图如下：

完整实例代码如下：

<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="content-type">
<meta name="description" content="在线取色器">
<meta name="keywords" content="在线取色器">
<title>RGB网页颜色在线取色器</title>
<style type="text/css">
<!--
a.g:link {
  text-decoration: none;
  color: #0000FF;
  font-size: 13px;
}
a.g:visited {
  text-decoration: none;
  color: #0000FF;
  font-size: 13px;
}
a.g:hover {
  text-decoration: none;
  color: #FF0000;
  font-size: 13px;
}
.gray{color:#666666}
.f12{font-size:12px}
.box{padding:2px;border:1px solid #CCC}
-->
</style>
<script language="javascript">
<!--
function h(obj,url){
obj.style.behavior='url(#default#homepage)';
obj.setHomePage(url);
}
function $(id){
  obj=document.getElementById(id);
  if (obj==null) obj=document.all.id;
  return obj;
}
//检查颜色值-Begin
  function isNum16(ch)
  {
    if (ch >= '0' && ch <= '9')return true;
    if (ch >= 'A' && ch <= 'F')return true;
    if (ch >= 'a' && ch <= 'f')return true;
    return false;
  }
  function isAllNum16(str1)
  {//判断颜色值。除第一个字符#外的任一个值是否大于等a,A,0,小于等于f,F,9，否则报错。
    for (i=1; i<str1.length; i++) {
      if (!isNum16(str1.charAt(i)))
      {
        return false;
      }
    }
    return true;
  }
function checkCol(myColor)
{  //made by jiarry,input color value to change background
if(myColor!="")
 {
 if(myColor.length !=7 || myColor.charAt(0)!="#")
  {
  alert("颜色值加#至少7位，请检查！");
  $("SelColor").value="";
  }
 else if(!isAllNum16(myColor))
 {
 alert("颜色代码错误，请检查\n 颜色代码示例:#ff6600");
 $("SelColor").value="";
 }
 else{
  return myColor;
  }
 }
}
//检查颜色值-END
var SelRGB = '#808080';
var DrRGB = "";
var SelGRAY = '120';
var SelCol="";
var baseCol="#808080";
var light="120";
var RGB=$("RGB");
var hexch = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
//add innerText to FireFox Begin
if(!document.all){
HTMLElement.prototype.__defineGetter__
(
"innerText",
function ()
{
var anyString = "";
var childS = this.childNodes;
for(var i=0; i<childS.length; i++)
{
if(childS[i].nodeType==1)
anyString += childS[i].tagName=="BR" ? '\n' : childS[i].innerText;
else if(childS[i].nodeType==3)
anyString += childS[i].nodeValue;
}
return anyString;
}
);
}
////add innerText to FireFox End
function ToHex(n)
{  var h, l;
  n = Math.round(n);
  l = n % 16;
  h = Math.floor((n / 16)) % 16;
  return (hexch[h] + hexch[l]);
}
function DoColor(c, l)
{ var r, g, b;
 r = '0x' + c.substring(1, 3);
 g = '0x' + c.substring(3, 5);
 b = '0x' + c.substring(5, 7);
 if(l > 120)
 {
  l = l - 120;
  r = (r * (120 - l) + 255 * l) / 120;
  g = (g * (120 - l) + 255 * l) / 120;
  b = (b * (120 - l) + 255 * l) / 120;
 }else
 {
  r = (r * l) / 120;
  g = (g * l) / 120;
  b = (b * l) / 120;
 }
 return '#' + ToHex(r) + ToHex(g) + ToHex(b);
}
function EndColor()
{ var i;
var GrayTable=$("GrayTable");
 if(DrRGB != SelRGB)
 {
  DrRGB = SelRGB;
  for(i = 0; i <= 30; i ++)
  GrayTable.rows[i].bgColor = DoColor(SelRGB, 240 - i * 8);
 }
 var SelColor=$("SelColor");
 var RGB=baseCol;
 var GRAY=light;
 var ShowColor=$("ShowColor");
 SelColor.value = DoColor(baseCol, light);
 ShowColor.bgColor = SelColor.value;
 document.getElementById('copytip').innerHTML='';
}
function ctOut(e) {
 baseCol=SelRGB;
 EndColor(baseCol);
 }
 function ctClick(e) {
 SelRGB = e.bgColor;
 EndColor();}
 function ctOver(e){
 baseCol = e.bgColor.toUpperCase();
 EndColor();
 }
 function gtOver(e){
 light = e.title;
 EndColor();
 }
 function gtOut() {
 light = SelGRAY;
 EndColor();
 }
 function gtClick(e){
 SelGRAY = e.title;
 EndColor();
 }
 function okClick(){
 var SelColor=$("SelColor");
 self.parent.setColor(SelColor.value);
 }
 function inpCol(o){
 var l=o.value;
 if (l.length==7){
 $('ShowColor').bgColor=checkCol(o.value);}
 else if(l.length>7){
 o.value=l.substring(0,7);
 alert("颜色代码加#不能超过7位");
 }
 }
-->
</script>
</head>
<body bgcolor=#ffffff text=#000000 vlink=#0033CC alink=#800080 link=#0033cc topmargin="0">
<p>　</p>
<table align="center" width="700"><tr><td>
 　</td></tr>
<tr><td>
 　</td></tr>
</table>
<table width="720" border="0" cellspacing="0" cellpadding="0" align="center">
<tr>
<td bgcolor="#40A6DD" width="720"><b style="color:#FFFF00; font-size:16px;"> 颜色选择器</b></td>
</tr>
<td class="padd10">
<br>
<table width="720" border="0" cellpadding="0" cellspacing="0" class="colTab">
<tr align="left" valign="top">
 <td width=515>
 <table border="0" cellspacing="0" cellpadding="0"><tr><td>
 <span class="gray f12">颜色：</span>
 <div class="box" style="padding:0;width:422px !important;width:424px">
<TABLE ID=ColorTable BORDER=0 CELLSPACING=2 CELLPADDING=0 style='cursor:pointer'>
<SCRIPT LANGUAGE=JavaScript>
function wc(r, g, b, n)
{
  r = ((r * 16 + r) * 3 * (15 - n) + 0x80 * n) / 15;
  g = ((g * 16 + g) * 3 * (15 - n) + 0x80 * n) / 15;
  b = ((b * 16 + b) * 3 * (15 - n) + 0x80 * n) / 15;
  document.write('<TD BGCOLOR=#' + ToHex(r) + ToHex(g) + ToHex(b) + ' height=8 width=12 onmouseover="ctOver(this)" onmouseout="ctOut(this)" onmousedown="ctClick(this)"></TD>');
}
var cnum = new Array(1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0);
 for(i = 0; i < 16; i ++)
 {
   document.write('<TR>');
   for(j = 0; j < 30; j ++)
   {
     n1 = j % 5;
     n2 = Math.floor(j / 5) * 3;
     n3 = n2 + 3;
     wc((cnum[n3] * n1 + cnum[n2] * (5 - n1)),
       (cnum[n3 + 1] * n1 + cnum[n2 + 1] * (5 - n1)),
       (cnum[n3 + 2] * n1 + cnum[n2 + 2] * (5 - n1)), i);
   }
   document.writeln('</TR>');
 }
</SCRIPT>
</TABLE>
</div>
</td><td valign="top" style="padding-left:30px ">
<span class="gray f12">亮度：</span>
<div class="box" style="width:20px !important;width:26px;">
<TABLE ID=GrayTable BORDER=0 CELLSPACING=0 CELLPADDING=0 style='cursor:pointer'>
<SCRIPT LANGUAGE=JavaScript>
 for(i = 255; i >= 0; i -= 8.5) {
   document.write('<TR BGCOLOR=#' + ToHex(i) + ToHex(i) + ToHex(i) + '><TD TITLE=' + Math.floor(i * 16 / 17) + ' height=5 width=20 onmouseover="gtOver(this)" onmouseout="gtOut()" onmousedown="gtClick(this)"></TD></TR>');
}
</SCRIPT>
</TABLE>
</div>
</td></tr>
</table>
 </td>
 <td width=87 valign="top">
<span class="gray f12">选中颜色：</span>
<div class="box" style="width:50px !important;width:54px ">
<table ID=ShowColor width="50" height="24" cellspacing="0" cellpadding="0">
<tr><td></td></tr>
</table>
</div>
</td>
<td width="128" valign="top">
<span class="gray f12">代码：</span><br>
 <INPUT TYPE=TEXT class="colInp" ID=SelColor value="#FFFFFF" SIZE=7 onKeyUp="inpCol(this)">
<input type=button style="visibility:hidden!important;visibility:visible" onClick="document.getElementById('SelColor').select();clipboardData.setData('text',document.getElementById('SelColor').value); document.getElementById('copytip').innerHTML='代码已复制到剪贴板';" value=" 复制 "><div id="copytip" class="gray f12" style="margin-top:5px"></div></div><div style="visibility:hidden">基色 : <SPAN ID=RGB>#000000</SPAN><BR>亮度 : <SPAN ID=GRAY>120</SPAN><BR></div></td>
</tr>
</table>
<script>
EndColor();
</script>
</td>
</tr>
</table>
<center>
</center>
</body>
</html>

PS：这里再为大家推荐几款本站的相关在线工具：

在线RGB、HEX颜色代码生成器：
http://tools.jb51.net/color/rgb_color_generator

RGB颜色查询对照表_颜色代码表_颜色的英文名称大全：
http://tools.jb51.net/color/jPicker

在线网页调色板工具：
http://tools.jb51.net/color/color_picker

在线颜色选择器工具/RGB颜色查询对照表：
http://tools.jb51.net/color/colorpicker

更多关于JavaScript相关内容可查看本站专题：《JavaScript切换特效与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》

希望本文所述对大家JavaScript程序设计有所帮助。