一群群的蚂蚁爬向鼠标
要完成此效果需要三个步骤
第一步：把如下代码加入到<head>区域中
<style type="text/css">
.ant {
height: 16px;
position: absolute;
visibility: hidden;
width: 16px;
}
.30pt{font-size:30pt;color:red;font-family:汉鼎繁淡古}
</style>
<SCRIPT LANGUAGE="JavaScript">
<!--
var dir = "ants/";
var images = new Array(
dir+"antdl.gif",
d
ir+"antdn.gif",
dir+"antdr.gif",
dir+"antlt.gif",
dir+"antrt.gif",
dir+"antul.gif",
d
ir+"antup.gif",
dir+"antur.gif"
);
var isMinNS4 = (document.layers) ? 1 : 0;
var isMinIE4 =
(document.all) ? 1 : 0;
var _LBimgList;
var _LBimgCount;
var _LBbase = "LBbase";
var _LBlow
= "LBlow";
var _LBhigh = "LBhigh";
var _LBwidth;
var _LBheight;
var _LBbaseLayer;
var
_LBlowLayer;
var _LBhighLayer;
function createLoadBar(width, height, bdSize, bdColor, bgColor,
fgColor, fontFace, fontSize, text) {
var txtLow, txtHigh, tblStart, tblEnd;
var str;
txtLow =
'<font color="' + fgColor + '" face="' + fontFace + '" size=' + fontSize + '>' + text +
'</font>';
txtHigh = '<font color="' + bgColor + '" face="' + fontFace + '" size=' + fontSize +
'>' + text + '</font>';
tblStart = '<table border=0 cellpadding=0 cellspacing=0 height=100%
width=100%><tr valign="center"><td align="center">';
tblEnd = '</td></tr></table>';
if
(isMinNS4)
str = '<layer name="' + _LBbase + '" bgcolor="' + bdColor + '" width=' + width + '
height=' + height + ' visibility="hide">\n'
+ ' <layer name="' + _LBlow + '" bgcolor="' +
bgColor + '" left=' + bdSize + ' top=' + bdSize + ' width=' + (width - 2 * bdSize) + ' height=' +
(height - 2 * bdSize) + '>' + tblStart + txtLow + tblEnd + '</layer>\n'
+ ' <layer name="' +
_LBhigh + '" bgcolor="' + fgColor + '" left=' + bdSize + ' top=' + bdSize + ' width=' + (width -
2 * bdSize) + ' height=' + (height - 2 * bdSize) + '>' + tblStart + txtHigh + tblEnd +
'</layer>\n'
+ '</layer>';
if (isMinIE4)
str = '<div id="' + _LBbase + '"
style="position:absolute; background-color:' + bdColor + '; width:' + width + 'px; height:' +
height + 'px; visibility:hidden;">\n'
+ ' <div id="' + _LBlow + '" style="position:absolute;
background-color=' + bgColor + '; left:' + bdSize + 'px; top:' + bdSize + 'px; width:' + (width -
2 * bdSize) + 'px; height:' + (height - 2 * bdSize) + 'px;">' + tblStart + txtLow + tblEnd +
'</div>\n'
+ ' <div id="' + _LBhigh + '" style="position:absolute; background-color=' + fgColor
+ '; left:' + bdSize + 'px; top:' + bdSize + 'px; width:' + (width - 2 * bdSize) + 'px; height:'
+ (height - 2 * bdSize) + 'px;">' + tblStart + txtHigh + tblEnd + '</div>\n'
+ '</div>';
d
ocument.writeln(str);
_LBwidth = width - 2 * bdSize;
_LBheight = height - 2 * bdSize;
}
function
startLoadBar(srcList, x, y) {
var i, w, h;
if (isMinNS4) {
_LBbaseLayer =
document.layers[_LBbase];
_LBlowLayer = _LBbaseLayer.document.layers[_LBlow];
_LBhighLayer =
_LBbaseLayer.document.layers[_LBhigh];
}
if (isMinIE4) {
_LBbaseLayer =
eval('document.all.' + _LBbase);
_LBlowLayer = eval('document.all.' + _LBlow);
_LBhighLayer
= eval('document.all.' + _LBhigh);
}
if (isMinNS4) {
w = window.innerWidth;
h =
window.innerHeight;
}
if (isMinIE4) {
w = document.body.clientWidth;
h =
document.body.clientHeight;
}
if (x == null)
x = Math.round((w - _LBwidth) / 2);
if (y
== null)
y = Math.round((h - _LBheight) / 2);
moveLayerTo(_LBbaseLayer, x, y);
clipLayer(_LBhighLayer, 0, 0, 0, _LBheight);
showLayer(_LBbaseLayer);
_LBimgCount = 0;
_LBimgList = new Array();
for (i = 0; i < srcList.length; i++) {
_LBimgList[i] = new
Image();
_LBimgList[i].onabort = _LBupdate;
_LBimgList[i].onerror = _LBupdate;
_LBimgList[i].onload = _LBupdate;
}
for (i = 0; i < srcList.length; i++)
_LBimgList[i].src
= srcList[i];
}
function endLoadBar() { // empty (can be changed) function called when
finished
}
function _LBupdate() {
var pct;
_LBimgCount++;
pct = _LBimgCount /
_LBimgList.length;
clipLayer(_LBhighLayer, 0, 0, Math.round(pct * _LBwidth), _LBheight);
if
(_LBimgCount == _LBimgList.length) {
setTimeout('hideLayer(_LBbaseLayer)', 500);
endLoadBar();
}
}
function moveLayerTo(layer, x, y) {
if (isMinNS4)
layer.moveTo(x, y);
if (isMinIE4) {
l
ayer.style.left = x;
layer.style.top = y;
}
}
function hideLayer(layer) {
if (isMinNS4)
l
ayer.visibility = "hide";
if (isMinIE4)
layer.style.visibility = "hidden";
}
function
getWindowWidth() {
if (isMinNS4)
return(window.innerWidth);
if (isMinIE4)
r
eturn(document.body.offsetWidth);
return(-1);
}
function getWindowHeight() {
if (isMinNS4)
r
eturn(window.innerHeight);
if (isMinIE4)
return(document.body.offsetHeight);
return(-1);
}
f
unction getPageScrollX() {
if (isMinNS4)
return(window.pageXOffset);
if (isMinIE4)
r
eturn(document.body.scrollLeft);
return(-1);
}
function getPageScrollY() {
if (isMinNS4)
r
eturn(window.pageYOffset);
if (isMinIE4)
return(document.body.scrollTop);
return(-1);
}
function
getHeight(layer) {
if (isMinNS4) {
if (layer.document.height)
return(layer.document.height);
e
lse
return(layer.clip.bottom - layer.clip.top);
}
if (isMinIE4) {
if (false &&
layer.style.pixelHeight)
return(layer.style.pixelHeight);
else
return(layer.clientHeight);
}
r
eturn(-1);
}
function getWidth(layer) {
if (isMinNS4) {
if (layer.document.width)
r
eturn(layer.document.width);
else
return(layer.clip.right - layer.clip.left);
}
if (isMinIE4) {
i
f (layer.style.pixelWidth)
return(layer.style.pixelWidth);
else
return(layer.clientWidth);
}
r
eturn(-1);
}
function getLeft(layer) {
if (isMinNS4)
return(layer.left);
if (isMinIE4)
r
eturn(layer.style.pixelLeft);
return(-1);
}
function getTop(layer) {
if (isMinNS4)
r
eturn(layer.top);
if (isMinIE4)
return(layer.style.pixelTop);
return(-1);
}
function
getRight(layer) {
if (isMinNS4)
return(layer.left + getWidth(layer));
if (isMinIE4)
r
eturn(layer.style.pixelLeft + getWidth(layer));
return(-1);
}
function getBottom(layer) {
if
(isMinNS4)
return(layer.top + getHeight(layer));
else if (isMinIE4)
return(layer.style.pixelTop +
getHeight(layer));
return(-1);
}
function moveLayerBy(layer, dx, dy) {
if (isMinNS4)
l
ayer.moveBy(dx, dy);
if (isMinIE4) {
layer.style.pixelLeft += dx;
layer.style.pixelTop+= dy;
}
}
f
unction showLayer(layer) {
if (isMinNS4)
layer.visibility = "show";
if (isMinIE4)
l
ayer.style.visibility = "visible";
}
function clipLayer(layer, clipleft, cliptop, clipright,
clipbottom) {
if (isMinNS4) {
layer.clip.left = clipleft;
layer.clip.top= cliptop;
l
ayer.clip.right= clipright;
layer.clip.bottom = clipbottom;
}
if (isMinIE4)
layer.style.clip =
'rect(' + cliptop + ' ' +clipright + ' ' + clipbottom + ' ' + clipleft +')';
}
var mouseX = 0;
v
ar mouseY = 0;
if (isMinNS4)
document.captureEvents(Event.MOUSEMOVE);
document.onmousemove =
getMousePosition;
function init() {
startLoadBar(images);
}
function getMousePosition(e) {
if
(isMinNS4) {
mouseX = e.pageX;
mouseY = e.pageY;
}
if (isMinIE4) {
mouseX = event.clientX +
document.body.scrollLeft;
mouseY = event.clientY + document.body.scrollTop;
}
return true;
}
var
ants = new Array(8);
function endLoadBar() {
var i;
for (i = 0; i < ants.length; i++) {
if
(isMinNS4) {
ants[i] = document.layers["ant" + (i + 1)];
ants[i].image =
ants[i].document.images["antimg" + (i + 1)];
}
if (isMinIE4) {
ants[i] = eval('document.all.ant'
+ (i + 1));
ants[i].image = document.images["antimg" + (i + 1)];
}
initAnt(i);
s
howLayer(ants[i]);
}
updateAnts();
}
function initAnt(n) {
var s, x, y;
x =
Math.floor(Math.random() * getWindowWidth());
y = Math.floor(Math.random() * getWindowHeight());
s
= Math.floor(Math.random() * 4);
if (s == 0)
x = -getWidth(ants[n]);
if (s == 1)
x =
getWindowWidth();
if (s == 2)
y = -getHeight(ants[n]);
if (s == 3)
y = getWindowHeight();
x +=
getPageScrollX();
y += getPageScrollY();
moveLayerTo(ants[n], x, y);
}
function updateAnts() {
v
ar i, dx, dy, theta, d;
d = 3;
for (i = 0; i < ants.length; i++) {
dx = mouseX -
getLeft(ants[i]);
dy = mouseY - getTop(ants[i]);
theta = Math.round(Math.atan2(-dy, dx) * 180 /
Math.PI);
if (theta < 0)
theta += 360;
if (Math.abs(dx) < d && Math.abs(dy) < d)
initAnt(i);
else
if (theta > 22.5 && theta <= 67.5) {
moveLayerBy(ants[i], d, -d);
ants[i].image.src =
dir+"antur.gif";
}
else if (theta > 67.5 && theta <= 112.5) {
moveLayerBy(ants[i], 0, -d);
a
nts[i].image.src = dir+"antup.gif";
}
else if (theta > 112.5 && theta <= 157.5) {
m
oveLayerBy(ants[i], -d, -d);
ants[i].image.src = dir+"antul.gif";
}
else if (theta > 157.5 &&
theta <= 202.5) {
moveLayerBy(ants[i], -d, 0);
ants[i].image.src = dir+"antlt.gif";
}
else if
(theta > 202.5 && theta <= 247.5) {
moveLayerBy(ants[i], -d, d);
ants[i].image.src =
dir+"antdl.gif";
}
else if (theta > 247.5 && theta <= 292.5) {
moveLayerBy(ants[i], 0, d);
a
nts[i].image.src = dir+"antdn.gif";
}
else if (theta > 292.5 && theta <= 337.5) {
m
oveLayerBy(ants[i], d, d);
ants[i].image.src = dir+"antdr.gif";
}
else {
moveLayerBy(ants[i], d,
0);
ants[i].image.src = dir+"antrt.gif";
}
}
setTimeout('updateAnts()', 50);
return;
}
-->
<
/script>
第二步：把如下代码加入到<body>区域中
<script language="JavaScript">
createLoadBar(240, 20, 1, "#000000", "#cccccc",
"#999999", "MS Sans serif,Arial,Helvetica", 1, "<b>Loading ants, please wait...</b>");
</script>
<div id="ant1" class="ant"><img name="antimg1" src="ants\transparent.gif" width=13
height=13></div>
<div id="ant2" class="ant"><img name="antimg2" src="ants\transparent.gif"
width=13 height=13></div>
<div id="ant3" class="ant"><img name="antimg3"
src="ants\transparent.gif" width=13 height=13></div>
<div id="ant4" class="ant"><img
name="antimg4" src="ants\transparent.gif" width=13 height=13></div>
<div id="ant5"
class="ant"><img name="antimg5" src="ants\transparent.gif" width=13 height=13></div>
<div
id="ant6" class="ant"><img name="antimg6" src="ants\transparent.gif" width=13 height=13></div>
<
div id="ant7" class="ant"><img name="antimg7" src="ants\transparent.gif" width=13
height=13></div>
<div id="ant8" class="ant"><img name="antimg8" src="ants\transparent.gif"
width=13 height=13></div>
第三步：把“OnLoad="init()"”加在<body>标记里
例如：<body OnLoad="init()">