使主頁呈現“飛舞”特效

2024-04-27 13:54:06

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供稿：網友

　　朋友，“天上掉陷餅”都聽說過吧？呵呵，陷餅它算個么，今天教你一個天上掉￥的招兒，并且～～嘩啦啦地掉！哈～哈～哈，來吧^_*

　　首先看效果

將下面的javaScript代碼加到< head >區就成了:

< Script Language="Javascript" >
< !-- Begin
var no = 30;
//設定下落字符數量
var speed = 5;
//設定字符下落的速度
var ns4up = (document.layers) ? 1 : 0;
var ie4up = (document.all) ? 1 : 0;
//NETSCAP和IE兩種不同瀏覽器各自進行定義
var s, x, y, sn, cs;
var a, r, cx, cy;
var i, doc_width = 800, doc_height = 600;
//設定字符下落區域為800*600
if (ns4up) {
doc_width = self.innerWidth;
doc_height = self.innerHeight;
}
else
if (ie4up) {
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}
//NETSCAP和IE兩種瀏覽器有別
x = new Array();
y = new Array();
r = new Array();
cx = new Array();
cy = new Array();
s = 8;
for (i = 0; i < no; ++ i) {
initRain();
//定義變量數組x, y, cx, cy, s
if (ns4up) {
if (i == 0) {
document.write("< layer name=/"dot"+ i +"/" left=/"1/" ");
document.write("top=/"1/" visibility=/"show/" >< font color=/"white/" >");
document.write(",￥< /font >< /layer >");
}
else {
document.write("< layer name=/"dot"+ i +"/" left=/"1/" ");
document.write("top=/"1/" visibility=/"show/" >< font color=/"white/" >");
document.write(", $ < /font >< /layer >");
}
}
//當i==0滿足與否時，NETSCAP中的表現
else
if (ie4up) {
if (i == 0) {
document.write("< div id=/"dot"+ i +"/" style=/"POSITION: ");
document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
document.write("visible; TOP: 15px; LEFT: 15px;/" >< font size=/"10/" color=/"white/" >");
document.write("￥< /font >< /div >");
}
else {
document.write("< div id=/"dot"+ i +"/" style=/"POSITION: ");
document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
document.write("visible; TOP: 15px; LEFT: 15px;/" >< font size=/"10/" color=/"white/" >");
document.write(" $ < /font >< /div >"); //設定要下落的的字符（￥、$）及位置
}
}
//當i==0滿足與不滿足時，IE瀏覽器中的表現
}
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();
//定義變量數組 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瀏覽器中的付值過程
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瀏覽器中的付值過程
// End -- >
< /Script >

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