使主页呈现“飞舞”特效

document.write(" $ < /font >< /div >"); //设定要下落的的字符（￥、$）及位置
}
}
//当i==0满足与不满足时，IE浏览器中的表现
}
function initRain() {
a = 6;
r[i] = 1;
sn = Math.sin(a);
cs = Math.cos(a);
cx[i] = Math.random() * doc_width 1;
cy[i] = Math.random() * doc_height 1;
x[i] = r[i] * sn cx[i];
y[i] = cy[i];
}
function makeRain() {
r[i] = 1;
cx[i] = Math.random() * doc_width 1;
cy[i] = 1;
x[i] = r[i] * sn cx[i];
y[i] = r[i] * cs cy[i];
}
function updateRain() {
r[i] = s;
x[i] = r[i] * sn cx[i];
y[i] = r[i] * cs cy[i];
}
function raindropNS() {
for (i = 0; i < no; i) {
updateRain();
//定义变量数组 a , sn , cs , cx, cy, s
if ((x[i] < = 1) || (x[i] >= (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
makeRain();
doc_width = self.innerWidth;
doc_height = self.innerHeight;
}
document.layers["dot" i].top = y[i];
document.layers["dot" i].left = x[i];
}
setTimeout("raindropNS()", speed);
}
function raindropIE() {
for (i = 0; i < no; i) {
updateRain();
//在NETSCAP浏览器中的付值过程
if ((x[i] < = 1) || (x[i] >= (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
makeRain();
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}
document.all["dot" i].style.pixelTop = y[i];
document.all["dot" i].style.pixelLeft = x[i];
}
setTimeout("raindropIE()", speed);
}
if (ns4up) {raindropNS(); }
else
if (ie4up) {raindropIE(); }
//在IE浏览器中的付值过程
// End -- >
< /Script >
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