风起花落时的空间

＜meta http-equiv="Content-Type" content="text/html; charset=gb2312"> ＜script language=JavaScript> var no = 10; // snow number var speed = 80; // smaller number moves the snow faster var snowflake = "http://images13.51.com/100/a/a6/84/bq71/1197619442_0.22344000.gif"; var ns4up = (document.layers) ? 1 : 0; // browser sniffer var ie4up = (document.all) ? 1 : 0; var dx, xp, yp; // coordinate and position variables var am, stx, sty; // amplitude and step variables var i, doc_width = 800, doc_height = 500; if (ns4up) { doc_width = self.innerWidth; doc_height = self.innerHeight; } else if (ie4up) { doc_width = 800; doc_height = 500; } dx = new Array(); xp = new Array(); yp = new Array(); am = new Array(); stx = new Array(); sty = new Array(); for (i = 0; i < no; ++ i) { dx[i] = 0; // set coordinate variables xp[i] = Math.random()*(doc_width-50); // set position variables yp[i] = Math.random()*doc_height; am[i] = Math.random()*20; // set amplitude variables stx[i] = 0.02 + Math.random()/10; // set step variables sty[i] = 0.7 + Math.random(); // set step variables if (ns4up) { // set layers if (i == 0) { document.write(""); } else { document.write(""); } } else if (ie4up) { if (i == 0) { document.write(""); } else { document.write(""); } } } function snowNS() { // Netscape main animation function for (i = 0; i < no; ++ i) { // iterate for every dot yp[i] += sty[i]; if (yp[i] > doc_height-50) { xp[i] = Math.random()*(doc_width-am[i]-30); yp[i] = 0; stx[i] = 0.02 + Math.random()/10; sty[i] = 0.7 + Math.random(); doc_width = self.innerWidth; doc_height = self.innerHeight; } dx[i] += stx[i]; document.layers["dot"+i].top = yp[i]; document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]); } setTimeout("snowNS()", speed); } function snowIE() { // IE main animation function for (i = 0; i < no; ++ i) { // iterate for every dot yp[i] += sty[i]; if (yp[i] > doc_height-50) { xp[i] = Math.random()*(doc_width-am[i]-30); yp[i] = 0; stx[i] = 0.02 + Math.random()/10; sty[i] = 0.7 + Math.random(); doc_width = document.body.clientWidth; doc_height = document.body.clientHeight; } dx[i] += stx[i]; document.all["dot"+i].style.pixelTop = yp[i]; document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]); } setTimeout("snowIE()", speed); } if (ns4up) { snowNS(); } else if (ie4up) { snowIE(); }