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说明: 模拟太空
效果: 点这里在新窗口中看效果！
代码:
<body bgcolor="black">
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
astropic = "earth.gif"; // location of YOUR
astronaut image
var xval = new Array(); // holds star coordinates
var yval = new Array();
no = 100; // number of stars in the background
speed = 200; // speed
xp = 20 + 100 * Math.random();
yp = 20 + 100 * Math.random();
angle = 3.14 * Math.random(); // astronaut angle
xinc = 3 * Math.sin(angle);
yinc = 3;
ie = (document.all)? 1 : 0;
ns = (document.layers)? 1: 0;
if (ie) {
width = document.body.clientWidth;
height = document.body.clientHeight;
for (var i = 0; i <= no; i++) {
document.write("<div id=\"div" + i+
"\" style=\"color:white;");
document.write("position:absolute;left:100;\">.</div>");
}
document.write("<div id=\"diva\" style=\"position:absolute;\">");
document.write("<img src=" + astropic + "
border=\"0\" width=\"100\" height=\"100\"></div>");
for (i = 0; i <= no; i++) {
xval[i] = width * Math.random();
yval[i] = height * Math.random();
document.all["div" + i].style.left = xval[i];
document.all["div" + i].style.top = yval[i];
}
}
if (ns) {
width = self.innerWidth;
height = self.innerHeight;
for (var i = 0; i <= no; i++) {
document.write("<layer id=\"div" + i+
"\" style=\"color:white;");
document.write("position:absolute;left:100;\">.</layer>");
}
document.write("<layer id=\"diva\" style=\"position:absolute;\">");
document.write("<img src=" + astropic + "
border=\"0\" width=\"100\" height=\"100\"></layer>");
for (i = 0; i <= no; i++) {
xval[i] = width * Math.random();
yval[i] = height * Math.random();
document.layers["div" + i].left = xval[i];
document.layers["div" + i].top = yval[i];
}
}
function star() {
for (i = 0; i <= no; i = i+4) {
xval[i] +=5;
if ((i%20) == 0) xval[i] += 10;
if(xval[i] >= width) xval[i] = width * Math.random();
if (ie) document.all["div" + i].style.left =
xval[i];
if (ns) document.layers["div" + i].left = xval[i];
}
return true;
}
function goangle() {
angle = 3.14 * Math.random();
xinc = 3 * Math.sin(angle);
return true;
}
function space() {
if (ie) {
document.all["diva"].style.left = xp;
document.all["diva"].style.top = yp;
}
if (ns) {
document.layers["diva"].left = xp;
document.layers["diva"].top = yp;
}
xp += xinc;
yp +=yinc;
star();
if ((xp >= (width - 50)) || (xp <= 10)) { goangle();
xinc = (-1) * xinc; }
if ((yp >= (height - 50)) || (yp <= 10)) { goangle();
yinc = (-1) * yinc; }
setTimeout('space()', speed);
}
space();
// End -->
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