JS实现LOGO像雪花一样落下特效

<HTML><HEAD><TITLE>LOGO从上落下</TITLE>

<SCRIPT language=JavaScript>

//窗口改变时重新加载页面  -Netscape的浏览器

function MM_reloadPage(init) {

if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {

document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}

else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();

}

MM_reloadPage(true);

//窗口改变时重新加载页面  -IE浏览器

function MM_preloadImages() {

var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();

var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)

if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}

sjLayer.style.visibility='hidden';

eslayer.style.visibility='hidden';

}

function MM_swapImgRestore() {

var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;

}

function MM_findObj(n, d) {

var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {

d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}

if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];

for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;

}

function MM_showHideLayers() {

var i,p,v,obj,args=MM_showHideLayers.arguments;

for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];

if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }

obj.visibility=v; }

}

</SCRIPT>

</HEAD>

<BODY  >

<SCRIPT language=JavaScript>

//判断浏览器

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

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

var no = 3;                             // 显示的图像数量

var speed = 20;                         // 图像移动的速度

var snowflake ="LOGO1.gif";      //图像地址

var filen = "http://www.baidu.com"                      // 单击图像时的链接

var dx, xp, yp;

var am, stx, sty;

var i, doc_width = 400, 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;

}

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("<html><title></title><body>");

document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");

document.write("top=\"15\" visibility=\"show\"><A href=\"" + filen + "\" target=\"_blank\"><img src=\"");

document.write(snowflake + "\" border=\"0\"></layer>");

document.write("</body></html>");

} else {

document.write("<html><title></title><body>");

document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");

document.write("top=\"15\" visibility=\"show\"><A href=\"" + filen + "\" target=\"_blank\"><img src=\"");

document.write(snowflake + "\" border=\"0\"></layer>");

document.write("</body></html>");

}

} else if (ie4up) {

if (i == 0) {

document.write("<html><title></title><body>");

document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");

document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");

document.write("visible; TOP: 15px; LEFT: 15px;\"><a href=\""+filen+"\" target=\"_blank\"><img src=\"");

document.write(snowflake + "\" border=\"0\"></div>");

document.write("</body></html>");

} else {

document.write("<html><title></title><body>");

document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");

document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");

document.write("visible; TOP: 15px; LEFT: 15px;\"><a href=\""+filen+"\" target=\"_blank\"><img src=\"");

document.write(snowflake + "\" border=\"0\"></div>");

document.write("</body></html>");

}

}

}

//实现Netscape浏览器中动画效果的方法

function snowNS() {

        for (i = 0; i < no; ++ i)

        {

        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];

        //指定图像的显示位置：x和y坐标

        document.layers["dot"+i].top = yp[i];

        document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);

        }

        setTimeout("snowNS()", speed);

}

//实现IE浏览器中动画效果的方法

function snowIE()

{

        //判断图像的数量

        for (i = 0; i < no; ++ i) {

        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();

        //重新获取文档的高度和宽度

        doc_width = document.body.clientWidth;

        doc_height = document.body.clientHeight;

        }

        dx[i] += stx[i];

        //指定图像的显示位置：x和y坐标

        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);  //根据速度循环执行动画方法

}

//判断浏览器类型，并调用不同的动画方法

if (ns4up) {

 snowNS();

} else if (ie4up) {

 snowIE();

}

</SCRIPT>

</TABLE>

</BODY></HTML>
巴特西

JS实现LOGO像雪花一样落下特效

最新文章

热门文章
