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js根据鼠标移动速度背景图片自动旋转的方法

2015-02-28 00:00 656 查看
本文实例讲述了js根据鼠标移动速度背景图片自动旋转的方法。分享给大家供大家参考。具体实现方法如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title>js实现图片快速旋转围绕的鼠标</title>

<meta http-equiv="content-type" content="text/html;charset=gb2312">

</head>

<body>

<script language="JavaScript">

<!--

var images='/favicon.ico';

var amount=7;

var speed=1;

var RunTime = 0;

var cntr=0;

var xcntr=100;

var pulse=25;

var Xpos = 0;

var Ypos = 0;

var _y;

var temp;

/*If you use an image larger or smaller than the one I've used

the cursor will be off center.Alter the 2 variables below to center it.*/

var UpDown=-10;

var LeftRight=-5;

if (document.all){

document.write('<div id="ieDiv" style="position:absolute;top:0px;left:0px">');

document.write('<div id="c" style="position:relative">');

for (n=0; n < amount; n++)

document.write('<img src="'+images+'" style="position:absolute;top:0px;left:0px;visibility:hidden">');

document.write('</div>');

document.write('</div>');

function FollowMouse(){

Xpos = document.body.scrollLeft+event.x+UpDown;

Ypos = document.body.scrollTop+event.y+LeftRight;

}

document.onmousemove = FollowMouse;

}

else if (document.layers){

window.captureEvents(Event.MOUSEMOVE);

function xFollowMouse(evnt){

Xpos = evnt.pageX+UpDown;

Ypos = evnt.pageY+LeftRight;

}

window.onMouseMove = xFollowMouse;

for (ns=0; ns < amount; ns++)

document.write("<LAYER NAME='n"+ns+"' LEFT='0' TOP='0' VISIBILITY='HIDE'><IMG SRC='"+images+"'></LAYER>");

}

function msi(){

if (document.layers){

for ( i = 0 ; i < ns ; i++ )

{

temp="n"+i

document.layers[0].visibility='show';

document.layers[0].top = Ypos+cntr*Math.cos((RunTime+i*4.5)/5);

document.layers[0].left =Xpos+cntr*Math.sin((RunTime+i*4.5)/5);

}

cntr+=1;

RunTime+=speed;

stp=setTimeout('msi()',10);

if (cntr>=100)

{

cntr=100;

speed=2.5;

for ( i = 0 ; i < ns ; i++ )

{

temp="n"+i

document.layers[temp].visibility='show';

document.layers[temp].top=Ypos+cntr*Math.cos((RunTime-100)*i/90);

document.layers[temp].left=Xpos+cntr*Math.sin((RunTime-100)*i/90);

}

}

if (RunTime>182)

{

speed=0.5;

for ( i = 0 ; i < ns ; i++ )

{

temp="n"+i

document.layers[temp].top=Ypos+xcntr*Math.cos(((RunTime-182)+i*4.5)/5);

document.layers[temp].left=Xpos+xcntr*Math.sin(((RunTime-182)+i*4.5)/5)*Math.cos((RunTime-182)/5);

}

}

}

else if (document.all){

for (i=0;i<ieDiv.all.c.all.length;i++)

{

ieDiv.all.c.all[0].style.visibility='visible';

ieDiv.all.c.all[0].style.top=Ypos+cntr*Math.cos((RunTime+i*4.5)/5);

ieDiv.all.c.all[0].style.left=Xpos+cntr*Math.sin((RunTime+i*4.5)/5);

}

cntr+=1;

RunTime+=speed;

stp=setTimeout('msi()',10);

if (cntr>=100)

{

cntr=100;

speed=2.5;

for (i=0;i<ieDiv.all.c.all.length;i++)

{

ieDiv.all.c.all[i].style.visibility='visible';

ieDiv.all.c.all[i].style.top=Ypos+cntr*Math.cos((RunTime-100)*i/90);

ieDiv.all.c.all[i].style.left=Xpos+cntr*Math.sin((RunTime-100)*i/90);

}

}

if (RunTime>182)

{

speed=0.5;

for (i=0;i<ieDiv.all.c.all.length;i++)

{

ieDiv.all.c.all[i].style.top=Ypos+xcntr*Math.cos(((RunTime-182)+i*4.5)/5);

ieDiv.all.c.all[i].style.left=Xpos+xcntr*Math.sin(((RunTime-182)+i*4.5)/5)*Math.cos((RunTime-182)/5);

}

}

}

if (RunTime>210)

{

xcntr-=10;

}

if (document.layers)

_y=-window.innerWidth-90;

else if (document.all)

_y=-document.body.clientWidth-90;

if (xcntr <= _y)

{

RunTime=0;

speed=1;

cntr=0;

xcntr=100;

}

}

msi()

//-->

</script>

<script language="Javascript">

<!--

function selectAll(theField){

var tempval=eval("document."+theField)

tempval.focus()

tempval.select()

}

//-->

</script>

</body>

</html>

希望本文所述对大家的javascript程序设计有所帮助。
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