使用Js代码编写一个网页上用的颜色拾色器，也就是选择颜色用的，用鼠标单击任意颜色块,将弹出颜色值，当你想使用某种颜色而不知道颜色值的时候，用这个小特效可以告诉你颜色值是多少，比较方便。
<Meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
<body style="font:menu">
<span class="style1">
<table border="0" cellspacing="1" cellpadding="3" width="350" align="center" bgcolor="#dddddd">
<tr bgcolor="#FFFFFF">
<td width="10%" align="center">
<select name="select1" onchange="selectmenu(this.value)">
<option value="2">绿
<option value="3">蓝
<option value="4">灰
</td>
<td width="90%" align="center">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center" style="font-size:12px">用鼠标单击下面的颜色块,将弹出颜色值</td>
</tr>
</table>
</td>
</tr>
<tr bgcolor="#FFFFFF">
<td width="10%" align="center">
<table id="table1" border="0" cellspacing="1" cellpadding="0">
<script language="JavaScript">
for(i=0;i<=15;++i){
document.write('<tr><td align="center" style="font:menu">'+ishex(i17) +'</td><td id="Ltd' + i +'" bgcolor="rgb('+ (i17) + ',0)" width="15" height="15" onclick="changeright(this.num)"></td></tr>')
document.all['Ltd' + i].num=i
}
function ishex(which){
return which.toString(16);}
</table></td>
<td width="90%" align="center">
<table id="table2" border="0" cellspacing="1" cellpadding="0">
<script language="JavaScript">
document.write('<tr><td></td>')
for(i=0;i<=15;++i){
document.write('<td align="center" style="font:menu; ">'+ishex(i*17)+'</td>');
}
document.write('</tr>')
for(i=0;i<=15;++i){
document.write('<tr>')
document.write('<td align="center" style="font:menu;">'+ishex(i*17)+'</td>')
for(j=0;j<=15;++j){
document.write('<td id="Rtd'+i+'and'+j+'" style="font:menu;" bgcolor="rgb(0,'+(i*17)+','+(j*17)+')" width="15" height="15" onclick="clickright(this)"></td>');}
document.write('</tr>')
}
</table>
</td>
</tr>
</table>
<script language="JavaScript">
function selectmenu(which){
switch(which){
case '1' :leftR();break;
case '2' :leftG();break;
case '3' :leftB();break;
case '4' :leftA();break;}
}
function leftR(){
for(i=0;i<=15;++i){
document.all['Ltd'+i].bgColor='rgb('+(i*17)+',0)';
}rightR(0)
}
function leftG(){
for(i=0;i<=15;++i){
document.all['Ltd'+i].bgColor='rgb(0,'+ (i*17) + ',0)';}
rightG(0)
}
function leftB(){
for(i=0;i<=15;++i){
document.all['Ltd'+i].bgColor='rgb(0,'+(i*17)+')';}
rightB(0)
}
function leftA(){
for(i=0;i<=15;++i){
document.all['Ltd'+i].bgColor='rgb('+(i*17)+','+(i*17)+')';}
rightA()
}
function rightR(which){
for(i=0;i<=15;++i){
for(j=0;j<=15;++j){
document.all['Rtd'+i+'and'+j].bgColor='rgb('+(which*17)+','+(j*17)+')';}
}}
function rightG(which){
for(i=0;i<=15;++i){
for(j=0;j<=15;++j){
document.all['Rtd'+i+'and'+j].bgColor='rgb('+(i17)+','+(which17)+','+(j*17)+')';
}
}}
function rightB(which){
for(i=0;i<=15;++i){
for(j=0;j<=15;++j){
document.all['Rtd'+ i+'and'+j].bgColor='rgb('+(i17)+','+(j17)+','+(which*17)+')';
}
}}
function rightA(){
for(i=0;i<=15;++i){
for(j=0;j<=15;++j){
document.all['Rtd'+i+'and'+j].bgColor='rgb('+(i16+j)+','+(i16+j)+','+(i*16+j)+')';
}
}}
function clickright(which){
alert(which.bgColor)
}
function changeright(which){
switch(select1.value){
case '1' :rightR(which);break;
case '2' :rightG(which);break;
case '3' :rightB(which);break;}
}