得到元素真实的背景颜色的js代码

得到元素真实的背景颜色

.classname {background-color:#ff99dd;}
#div3 {background-color:#d8bfd8;}
div {background-color:#87cefa;border:1px solid #333333;margin:10px;padding:4px;}
body {background-color:#bed742;}
#div4 {background-color:transparent;}



得到元素真实的背景颜色 By Longbill
div1 直接通过div标签定义背景色(#87cefa)
div2 通过class name定义背景色(#ff99dd)
div3 通过id定义背景色(#d8bfd8)
div4 这是一个透明的div，背景色应为上一个元素的颜色(#bed742)
getBg()

function getBg(element)
{//author: Longbill (www.longbill.cn)
//dnew.cn修补
var rgbToHex=function(rgbarray,array){
if (rgbarray.length < 3) return false;
if (rgbarray.length == 4 && rgbarray[3] == 0 && !array) return 'transparent';
var hex = [];
for (var i = 0; i < 3; i++){
var bit = (rgbarray[i] - 0).toString(16);
hex.push((bit.length == 1) ? '0' + bit : bit);
}
return array ? hex : '#' + hex.join('');
}
//---------------
if (typeof element == "string") element = document.getElementById(element);
if (!element) return;
cssProperty = "backgroundColor";
mozillaEquivalentCSS = "background-color";
if (element.currentStyle)
var actualColor = element.currentStyle[cssProperty];
else
{
var cs = document.defaultView.getComputedStyle(element, null);
var actualColor = cs.getPropertyValue(mozillaEquivalentCSS).match(/\d{1,3}/g);
//-----
actualColor = (actualColor) ? rgbToHex(actualColor) : "transparent";
}
if (actualColor == "transparent" && element.parentNode)
return arguments.callee(element.parentNode);
if (actualColor == null)
return "#ffffff";
else
return actualColor;
}
function go()
{
for(var i=1;i