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Source
<html lang="ja">
<head>
<title>javascript</title>
<script>
var sw = new Array(1,5,10);
var rgb = new Array(0,0,0);
var timer_is_set=false;
function Mode16(n){
crgb=((n>255)? 255:((n<0)? 0:n)).toString(16);
if(n<16)crgb="0"+crgb;
return crgb;
}
function chg_bg_color(){
for(var i=0;i<3;i++) {
sw[i] = (rgb[i]<=0)? sw[i]:((rgb[i]>=255)? 0-sw[i]:sw[i]);
sw[i] = (rgb[i]<=0 && sw[i]<0)? 0-sw[i]:((rgb[i]>=255 && sw[i]>255)? 0-sw[i]:sw[i]);
rgb[i] += sw[i];
}
// document.bgColor="#"+Mode16(rgb[0])+Mode16(rgb[1])+Mode16(rgb[2]);
document.body.style.backgroundColor = "#"+Mode16(rgb[0])+Mode16(rgb[1])+Mode16(rgb[2]);
if (timer_is_set) clearTimeout(timer_ID);
timer_ID=setTimeout("chg_bg_color()",200);
Timer_is_set=true;
}
</script>
</head>
<body onLoad="chg_bg_color()">
</body>
</html>
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