制作下雨效果實例代碼
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>標(biāo)題頁</title>
</head>
<body>
<script language="JavaScript">
var no = 50;
var speed = 1;
var ns4up = (document.layers) ? 1 : 0; //針對netscape時，使用的對象-document.layers
var ie4up = (document.all) ? 1 : 0; //針對ie時，使用的對象-document.all
var s, x, y, sn, cs;
var a, r, cx, cy;
var i, doc_width = 800, doc_height = 600; //設(shè)置窗體的初始高度和寬度
if (ns4up) { //netscape時，獲取窗體的高度和寬度
doc_width = self.innerWidth;
doc_height = self.innerHeight;
}
else
if (ie4up) { //ie時，獲取窗體的高度和寬度
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}
x = new Array();
y = new Array();
r = new Array();
cx = new Array();
cy = new Array();
s = 8;
for (i = 0; i < no; ++ i) {
initRain(); //
if (ns4up) { //netscape時，使用layer設(shè)置一些動態(tài)雨點
if (i == 0) {
document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");
document.write("top=\"1\" visibility=\"show\"><font color=\"blue\">");
document.write(",</font></layer>");
}
else {
document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");
document.write("top=\"1\" visibility=\"show\"><font color=\"blue\">");
document.write(",</font></layer>");
}
}
else
if (ie4up) { //IE時，使用div設(shè)置一些動態(tài)雨點
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 color=\"blue\">");
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 color=\"blue\">");
document.write(",</font></div>");
}
}
}
function initRain() { //初始化坐標(biāo)值-動態(tài)
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() { //設(shè)置動態(tài)的x,y坐標(biāo)
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 setRain() { //重新生成x,y坐標(biāo)
r[i] += s;
x[i] = r[i] * sn + cx[i];
y[i] = r[i] * cs + cy[i];
}
function raindropNS() { //在netscape中的下雨效果
for (i = 0; i < no; ++ i) {
setRain();
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() { //在IE中的下雨效果
for (i = 0; i < no; ++ i) {
setRain();
if ((x[i] <= 1) || (x[i] >= (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
makeRain();
}
document.all["dot"+i].style.pixelTop = y[i]; //循環(huán)改變雨點的x和y坐標(biāo)
document.all["dot"+i].style.pixelLeft = x[i];
}
setTimeout("raindropIE()", speed); //實現(xiàn)定時器，實現(xiàn)不斷下雨的效果
}
if (ns4up) {
raindropNS();
}
else
if (ie4up) {
raindropIE();
}
</script>
</body>
</html>
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