緩緩上升

語法說明：

	在 var no = 20; 中修改圖案出現的數量
	在 var speed = 50; 中修改圖上昇的速度，數值越大就越慢，越小越快
	請自行修改上昇圖案所需使用的圖檔網址
	欲增加或減少出現的圖案種類，設定 snow[#] = "圖檔連結網址" 即可，其中 # 代表為數字
	在 var i, doc_width = 800, doc_height = 1800; 中修改圖出現的範圍

<script language="JavaScript">

var no = 20; 

var speed = 50;
var snow = new Array();

snow[0] = "圖檔連結網址"
snow[1] = "圖檔連結網址"
snow[2] = "圖檔連結網址"

var ns4up = (document.layers) ? 1 : 0; 
var ie4up = (document.all) ? 1 : 0;
var dx, xp, yp; 
var am, stx, sty; 

var i, doc_width = 800, doc_height = 1800; 
if (ns4up) {
        doc_width = self.innerWidth;
        doc_height = self.innerHeight;
} else if (ie4up) {
        doc_width = document.body.clientWidth;
        doc_height = document.body.clientHeight;
}
dx = new Array();
xp = new Array();
yp = new Array();
am = new Array();
stx = new Array();
sty = new Array();
j = 0;
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("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src=\""+ snow[j] + "\" border=\"0\"></layer>");
                } else {
                        document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src=\""+ snow[j] + "\" border=\"0\"></layer>");
                }        } else if (ie4up) {                if (i == 0) 
{
                        document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"VISIBILITY: visible; TOP: 15px; LEFT: 15px; width:1;\"><img src=\"" + snow[j] + "\" border=\"0\"></div>");
                } else {
                        document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"VISIBILITY: visible; TOP: 15px; LEFT: 15px; width:1;\"><img src=\"" + snow[j] + "\" border=\"0\"></div>");
                }        }
        if (j == (snow.length-1)) { j = 0; } else { j += 1; }
}
function snowNS() {  // Netscape main animation function
        for (i = 0; i < no; ++ i) {  // iterate for every dot
                yp[i] -= sty[i];                if (yp[i] < -50) {
                        xp[i] = Math.random()*(doc_width-am[i]-30);
                        yp[i] = doc_height;
                        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] < -50) {
                        xp[i] = Math.random()*(doc_width-am[i]-30);
                        yp[i] = doc_height;
                        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();
}
-->
</script>

　

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