📄 10-4.htm
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<html>
<head>
<title>§10.4 非常直观的背景色选择器</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body bgcolor="#FFFFFF">
<script language="JavaScript">
<!--
// create 6-element array
var hex = new Array(6) // assign non-dithered descriptors
hex[0] = "FF"
hex[1] = "CC"
hex[2] = "99"
hex[3] = "66"
hex[4] = "33"
hex[5] = "00"
// accept triplet string and display as background color
function display(triplet)
{
document.bgColor = '#' + triplet
alert('现在的背景色是 #'+triplet)
}
// draw a single table cell based on all descriptors
function drawCell(red, green, blue)
{
// open cell with specified hexadecimal triplet background color
document.write('<TD BGCOLOR="#' + red + green + blue + '">')
// open a hypertext link with javascript: scheme to call display function
document.write('<A HREF="javascript:display(\'' + (red + green + blue) + '\')">')
// print transparent image (use any height and width)
document.write('<IMG SRC="place.gif" BORDER=0 HEIGHT=12 WIDTH=12>')
// close link tag
document.write('</A>')
// close table cell
document.write('</TD>')
}
// draw table row based on red and blue descriptors
function drawRow(red, blue)
{
// open table row
document.write('<TR>')
// loop through all non-dithered color descripters as green hex
for (var i = 0; i < 6; ++i)
{
drawCell(red, hex[i], blue)
}
// close current table row
document.write('</TR>')
}
// draw table for one of six color cube panels
function drawTable(blue)
{
// open table (one of six cube panels)
document.write('<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0>')
// loop through all non-dithered color descripters as red hex
for (var i = 0; i < 6; ++i)
{
drawRow(hex[i], blue)
}
// close current table
document.write('</TABLE>')
}
// draw all cube panels inside table cells
function drawCube()
{
document.write('<TABLE CELLPADDING=5 CELLSPACING=0 BORDER=1><TR>')
// loop through all non-dithered color descripters as blue hex
for (var i = 0; i < 6; ++i)
{
// open table cell with white background color
document.write('<TD BGCOLOR="#FFFFFF">')
// call function to create cube panel with hex[i] blue hex
drawTable(hex[i])
// close current table cell
document.write('</TD>')
}
// close table row and table
document.write('</TR></TABLE>')
}
// call function to begin execution
drawCube()
// -->
</script>
</body>
</html>
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