38、在你的网页中加入下雨的效果

38、在你的网页中加入下雨的效果

要完成此效果把如下代码加入到<body bgcolor="#000000">区域中

 

<script language="JavaScript">

<!--

var no = 50;

var speed = 1;

var ns4up = (document.layers) ? 1 : 0;

var ie4up = (document.all) ? 1 : 0;

var s, x, y, sn, cs;

var a, r, cx, cy;

var i, doc_width = 800, doc_height = 600;

if (ns4up) {

doc_width = self.innerWidth;

doc_height = self.innerHeight;

}

else

if (ie4up) {

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) {

if (i == 0) {

document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");

document.write("top=\"1\" visibility=\"show\"><font color=\"#999999\">");

document.write(",</font></layer>");

}

else {

document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");

document.write("top=\"1\" visibility=\"show\"><font color=\"#999999\">");

document.write(",</font></layer>");

   }

}

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 color=\"#999999\">");

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=\"#999999\">");

document.write(",</font></div>");

      }

   }

}

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();

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();

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();

}

 

-->

</script>

 

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