81、跟随鼠标的LOGO

81、跟随鼠标的LOGO

脚本说明:

把如下代码加入<body>区域中

<DIV id=dot0

style="HEIGHT: 0px; LEFT: 0px; POSITION: absolute; TOP: 0px; VISIBILITY: hidden; WIDTH: 0px"></DIV>

<DIV id=dot1

style="HEIGHT: 0px; LEFT: 0px; POSITION: absolute; TOP: 0px; WIDTH: 0px"><IMG

height=30 src="java2000.gif" width=88> </DIV>

<DIV id=dot2

style="HEIGHT: 0px; LEFT: 0px; POSITION: absolute; TOP: 0px; WIDTH: 0px"><IMG

height=30 src="java2000.gif" width=88> </DIV>

<SCRIPT language=JavaScript>

<!--

// define number of divs

var nDots = 3;

// define starting position of image

var Xpos = 0;

var Ypos = 0;

// define speed of moving image

var DELTAT = .01;

// define how far the image drops from the cursor

var SEGLEN = 10;

// define how big is the loop the image makes around the cursor

var SPRINGK = 10;

// the greater the mass the slower the speed of image

var MASS = 1;

// the greater the gravity the smaller is the loop

var GRAVITY = 50;

// the greater the resistance the slower the speed of image

var RESISTANCE = 10;

var STOPVEL = 0.1;

var STOPACC = 0.1;

var DOTSIZE = 11;

// define the size of the bounces of the image

var BOUNCE = 0.75;

var isNetscape = navigator.appName=="Netscape";

var followmouse = true;

var dots = new Array();

init();

function init()

{

var i = 0;

for (i = 0; i < nDots; i++) {

dots[i] = new dot(i);

}

if (!isNetscape) {

//

}

for (i = 0; i < nDots; i++) {

dots[i].obj.left = dots[i].X;

dots[i].obj.top = dots[i].Y;

}

if (isNetscape) {

startanimate();

} else {

setTimeout("startanimate()", 3000);

}

}

function dot(i)

{

this.X = Xpos;

this.Y = Ypos;

this.dx = 0;

this.dy = 0;

if (isNetscape) {  

this.obj = eval("document.dot" + i);

} else {

this.obj = eval("dot" + i + ".style");

}

}

function startanimate() {      

    setInterval("animate()", 20);

}

function setInitPositions(dots)

{

var startloc = document.all.tags("LI");

var i = 0;

for (i = 0; i < startloc.length && i < (nDots - 1); i++) {

dots[i+1].X = startloc[i].offsetLeft

startloc[i].offsetParent.offsetLeft - DOTSIZE;

dots[i+1].Y = startloc[i].offsetTop +

startloc[i].offsetParent.offsetTop + 2*DOTSIZE;

}

dots[0].X = dots[1].X;

dots[0].Y = dots[1].Y - SEGLEN;

}

function MoveHandler(e)

{

Xpos = e.pageX;

Ypos = e.pageY;      

return true;

}

function MoveHandlerIE() {

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

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

}

if (isNetscape) {

document.captureEvents(Event.MOUSEMOVE);

document.onMouseMove = MoveHandler;

} else { document.onmousemove = MoveHandlerIE; }

function vec(X, Y)

{

this.X = X;

this.Y = Y;

}

function springForce(i, j, spring)

{

var dx = (dots[i].X - dots[j].X);

var dy = (dots[i].Y - dots[j].Y);

var len = Math.sqrt(dx*dx + dy*dy);

if (len > SEGLEN) {

var springF = SPRINGK * (len - SEGLEN);

spring.X += (dx / len) * springF;

spring.Y += (dy / len) * springF;

}

}

function animate() {   

var start = 0;

if (followmouse) {

dots[0].X = Xpos;

dots[0].Y = Ypos;      

start = 1;

}

for (i = start ; i < nDots; i++ ) {

var spring = new vec(0, 0);

if (i > 0) {

springForce(i-1, i, spring);

}

if (i < (nDots - 1)) {

springForce(i+1, i, spring);

}

var resist = new vec(-dots[i].dx * RESISTANCE,-dots[i].dy * RESISTANCE);

var accel = new vec((spring.X + resist.X)/ MASS,(spring.Y + resist.Y)/ MASS + GRAVITY);

   dots[i].dx += (DELTAT * accel.X);

   dots[i].dy += (DELTAT * accel.Y);

if (Math.abs(dots[i].dx) < STOPVEL && Math.abs(dots[i].dy) < STOPVEL &&

Math.abs(accel.X) < STOPACC &&

Math.abs(accel.Y) < STOPACC) {

dots[i].dx = 0;

dots[i].dy = 0;

}

dots[i].X += dots[i].dx;

dots[i].Y += dots[i].dy;

var height, width;

if (isNetscape) {

height = window.innerHeight + document.scrollTop;

width = window.innerWidth + document.scrollLeft;

} else {       

height = document.body.clientHeight + document.body.scrollTop;

width = document.body.clientWidth + document.body.scrollLeft;

}

if (dots[i].Y >=  height - DOTSIZE - 1) {

if (dots[i].dy > 0) {

dots[i].dy = BOUNCE * -dots[i].dy;

}

dots[i].Y = height - DOTSIZE - 1;

}

if (dots[i].X >= width - DOTSIZE) {

if (dots[i].dx > 0) {

dots[i].dx = BOUNCE * -dots[i].dx;

}

dots[i].X = width - DOTSIZE - 1;

}

if (dots[i].X < 0) {

if (dots[i].dx < 0) {

dots[i].dx = BOUNCE * -dots[i].dx;

}

dots[i].X = 0;

}

dots[i].obj.left = dots[i].X;                  

dots[i].obj.top =  dots[i].Y;          

}

}

// -->

</SCRIPT>

 

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