背景调色板

- 中国WEB开发者网络 (http://www.webasp.net)
-- 网页特效 (http://www.webasp.net/javascript/)
--- 背景调色板 (http://www.webasp.net/javascript/1/203.htm)
-- 发布日期： 2004-06-18
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<!-- 第 1 步： -->
<!-- 把下面的代码加到<BODY></BODY>区域中： -->

<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) {
// set color as background color
document.bgColor = '#' + triplet

// display the color hexadecimal 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() {
// open table
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>

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