117 lines
3.1 KiB
JavaScript
117 lines
3.1 KiB
JavaScript
var no = 30;
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var speed = 30;
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var snowflake = "snow1.gif";
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var ns4up = (navigator.appName=="Netscape" && navigator.appVersion.charAt(0)=="4") ? 1 : 0;
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var ie4up = (document.all) ? 1 : 0;
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var ns6up = (document.getElementById&&!document.all) ? 1 : 0;
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var dx, xp, yp;
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var am, stx, sty;
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var i, doc_width = 1280, doc_height = 800;
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if (ns4up||ns6up) {
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doc_width = self.innerWidth;
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doc_height = self.innerHeight;
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} else if (ie4up) {
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doc_width = document.body.clientWidth;
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doc_height = document.body.clientHeight;
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}
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dx = new Array();
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xp = new Array();
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yp = new Array();
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am = new Array();
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stx = new Array();
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sty = new Array();
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for (i = 0; i < no; ++ i) {
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dx[i] = 0;
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xp[i] = Math.random()*(doc_width-50);
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yp[i] = Math.random()*doc_height;
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am[i] = Math.random()*20;
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stx[i] = 0.02 + Math.random()/10;
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sty[i] = 0.7 + Math.random();
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if (ns4up) {
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if (i == 0) {
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document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
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document.write("top=\"15\" visibility=\"show\"><img src=\"");
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document.write(snowflake + "\" border=\"0\"></layer>");
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} else {
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document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
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document.write("top=\"15\" visibility=\"show\"><img src=\"");
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document.write(snowflake + "\" border=\"0\"></layer>");
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}
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} else if (ie4up||ns6up) {
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if (i == 0) {
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document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
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document.write("fixed; Z-INDEX: "+ i +"; VISIBILITY: ");
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document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\"");
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document.write(snowflake + "\" border=\"0\"></div>");
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} else {
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document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
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document.write("fixed; Z-INDEX: "+ i +"; VISIBILITY: ");
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document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\"");
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document.write(snowflake + "\" border=\"0\"></div>");
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}
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}
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}
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function snowNS() {
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for (i = 0; i < no; ++ i) {
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yp[i] += sty[i];
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if (yp[i] > doc_height-50) {
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xp[i] = Math.random()*(doc_width-am[i]-30);
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yp[i] = 0;
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stx[i] = 0.02 + Math.random()/10;
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sty[i] = 0.7 + Math.random();
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doc_width = self.innerWidth;
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doc_height = self.innerHeight;
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}
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dx[i] += stx[i];
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document.layers["dot"+i].top = yp[i];
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document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);
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}
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setTimeout("snowNS()", speed);
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}
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function snowIE() {
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for (i = 0; i < no; ++ i) {
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yp[i] += sty[i];
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if (yp[i] > doc_height-50) {
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xp[i] = Math.random()*(doc_width-am[i]-30);
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yp[i] = 0;
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stx[i] = 0.02 + Math.random()/10;
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sty[i] = 0.7 + Math.random();
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doc_width = document.body.clientWidth;
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doc_height = document.body.clientHeight;
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}
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dx[i] += stx[i];
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document.all["dot"+i].style.pixelTop = yp[i];
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document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
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}
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setTimeout("snowIE()", speed);
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}
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function snowNS6() {
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for (i = 0; i < no; ++ i) {
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yp[i] += sty[i];
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if (yp[i] > doc_height-50) {
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xp[i] = Math.random()*(doc_width-am[i]-30);
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yp[i] = 0;
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stx[i] = 0.02 + Math.random()/10;
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sty[i] = 0.7 + Math.random();
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doc_width = self.innerWidth;
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doc_height = self.innerHeight;
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}
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dx[i] += stx[i];
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document.getElementById("dot"+i).style.top = yp[i]+"px";
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document.getElementById("dot"+i).style.left = xp[i] + am[i]*Math.sin(dx[i])+"px";
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}
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setTimeout("snowNS6()", speed);
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}
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if (ns4up) {
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snowNS();
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} else if (ie4up) {
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snowIE();
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}else if (ns6up) {
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snowNS6();
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} |