js色彩选择如何实现

来源：互联网发布：上财和复旦的差距知乎编辑：程序博客网时间：2024/04/28 10:46

第一种:

<html>
    <head>
    <title> 在颜色选取 </title>
    <meta       http-equiv="Content-Type"       content="text/html;       charset=gb2312">
    <SCRIPT>
    var       sInitColor       =       null;
    function       callColorDlg(){

    if       (sInitColor       ==       null)
    //display       color       dialog       box
    var       sColor       =       dlgHelper.ChooseColorDlg();
    else
    var       sColor       =       dlgHelper.ChooseColorDlg(sInitColor);
    //change       decimal       to       hex
    sColor       =       sColor.toString(16);
    if       (sColor.length       <       6)       {
            var       sTempString       =       "000000".substring(0,6-sColor.length);
            sColor       =       sTempString.concat(sColor);
    }
    alert("你选的颜色是：       #"+sColor)
    document.body.style.background = "#" +sColor;
    }
    </SCRIPT>
    </head>

    <body>
    <BUTTON       ID="ofntColor"       TITLE="选择颜色"       onclick="callColorDlg()"> 选择颜色 </BUTTON>
    <OBJECT       id=dlgHelper       CLASSID="clsid:3050f819-98b5-11cf-bb82-00aa00bdce0b" width="0px"       height="0px"> </OBJECT>

    </body>
    </html>

第二种:

<HTML><HEAD><TITLE>颜色</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<STYLE type=text/css>TD {
FONT-SIZE: 10.8pt
}
BODY {
FONT-SIZE: 10.8pt
}
BUTTON {
WIDTH: 5em
}
</STYLE>

<SCRIPT language=JavaScript>
var SelRGB = '';
var DrRGB = '';
var SelGRAY = '120';

var hexch = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');

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;

if(DrRGB != SelRGB)
{
    DrRGB = SelRGB;
    for(i = 0; i <= 30; i ++)
      GrayTable.rows(i).bgColor = DoColor(SelRGB, 240 - i * 8);
}

SelColor.value = DoColor(RGB.innerText, GRAY.innerText);
ShowColor.bgColor = SelColor.value;
}
</SCRIPT>

<SCRIPT language=JavaScript event=onclick for=ColorTable>
SelRGB = event.srcElement.bgColor;
EndColor();
</SCRIPT>

<SCRIPT language=JavaScript event=onmouseover for=ColorTable>
RGB.innerText = event.srcElement.bgColor;
EndColor();
</SCRIPT>

<SCRIPT language=JavaScript event=onmouseout for=ColorTable>
RGB.innerText = SelRGB;
EndColor();
</SCRIPT>

<SCRIPT language=JavaScript event=onclick for=GrayTable>
SelGRAY = event.srcElement.title;
EndColor();
</SCRIPT>

<SCRIPT language=JavaScript event=onmouseover for=GrayTable>
GRAY.innerText = event.srcElement.title;
EndColor();
</SCRIPT>

<SCRIPT language=JavaScript event=onmouseout for=GrayTable>
GRAY.innerText = SelGRAY;
EndColor();
</SCRIPT>

<SCRIPT language=JavaScript event=onclick for=Ok>
window.returnValue = SelColor.value;
window.close();
</SCRIPT>

<META content="MSHTML 6.00.2600.0" name=GENERATOR></HEAD>
<BODY bgColor=menu>
<DIV align=center>
<CENTER>
<TABLE cellSpacing=10 cellPadding=0 border=0>
<TBODY>
<TR>
    <TD>
      <TABLE id=ColorTable style="CURSOR: hand" cellSpacing=0 cellPadding=0
      border=0>
        <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=8></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>

        <TBODY></TBODY></TABLE></TD>
    <TD>
      <TABLE id=GrayTable style="CURSOR: hand" cellSpacing=0 cellPadding=0
      border=0>
        <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=4 width=20></TD></TR>');
</SCRIPT>