网页特效（鼠标特效代码）:弹性十足的鼠标跟随效果-飞外网

网页特效（鼠标特效代码）:弹性十足的鼠标跟随效果-飞外网

网页特效（鼠标特效代码）:弹性十足的鼠标跟随效果

html

head

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div id= dot0 > img src= /edu/img/js/200909/s1.jpg height=11 width=11

/div

div id= dot1 > img src= /edu/img/js/200909/s3.jpg height=11 width=11

/div

div id= dot2 > img src= /edu/img/js/200909/s4.jpg height=11 width=11

/div

div id= dot3 > img src= /edu/img/js/200909/s5.jpg height=11 width=11

/div

div id= dot4 > img src= /edu/img/js/200909/s6.jpg height=11 width=11

/div

div id= dot5 > img src= /edu/img/js/200909/s7.jpg height=11 width=11

/div

div id= dot6 > img src= /edu/img/js/200909/s8.jpg height=11 width=11

/div

script. LANGUAGE= JavaScript

!-- hide code

/*

URL: http://www.feedwhy.com

*/

var nDots = 7;

var Xpos = 0;

var Ypos = 0;

// fixed time step, no relation to real time

var DELTAT = .01;

// size of one spring in pixels

var SEGLEN = 10;

// spring constant, stiffness of springs

var SPRINGK = 10;

// all the physics is bogus, just picked stuff to

// make it look okay

var MASS = 1;

// Positive XGRAVITY pulls right, negative pulls left

// Positive YGRAVITY pulls down, negative up

var XGRAVITY = 0;

var YGRAVITY = 50;

// RESISTANCE determines a slowing force proportional to velocity

var RESISTANCE = 10;

// stopping criterea to prevent endless jittering

// doesn't work when sitting on bottom since floor

// doesn't push back so acceleration always as big

// as gravity

var STOPVEL = 0.1;

var STOPACC = 0.1;

var DOTSIZE = 11;

// BOUNCE is percent of velocity retained when

// bouncing off a wall

var BOUNCE = 0.75;

var isNetscape = navigator.appName== Netscape

// always on for now, could be played with to

// let dots fall to botton, get thrown, etc.

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) {

// I only know how to read the locations of the

// LI items in IE

//skip this for now

// setInitPositions(dots)

}

// set their positions

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

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

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

}

if (isNetscape) {

// start right away since they are positioned

// at 0, 0

startanimate();

} else {

// let dots sit there for a few seconds

// since they're hiding on the real bullets

setTimeout( startanimate() , 1000);

}

}

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);

}

// This is to line up the bullets with actual LI tags on the page

// Had to add -DOTSIZE to X and 2*DOTSIZE to Y for IE 5, not sure why

// Still doesn't work great

function setInitPositions(dots)

{

// initialize dot positions to be on top

// of the bullets in the ul

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;

}

// put 0th dot above 1st (it is hidden)

dots.X = dots.X;

dots.Y = dots.Y - SEGLEN;

}

// just save mouse position for animate() to use

function MoveHandler(e)

{

Xpos = e.pageX;

Ypos = e.pageY;

return true;

}

// just save mouse position for animate() to use

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 = Mov(苏轼的诗有哪些？苏轼被我们熟知的诗有《题西林壁》、《饮湖上初晴后雨二首·其二》、《水调歌头》、《念奴娇·赤壁怀古》和《题领巾绝句》等等。)eHandlerIE;

}

function vec(X, Y)

{

this.X = X;

this.Y = Y;

}

// adds force in X and Y to spring for dot[i] on dot[j]

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() {

// dots follows the mouse,

// though no dot is drawn there

var start = 0;

if (followmouse) {

dots.X = Xpos;

dots.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);

}

// air resisitance/friction

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

-dots[i].dy * RESISTANCE);

// compute new accel, including gravity

var accel = new vec((spring.X + resist.X)/MASS + XGRAVITY,

(spring.Y + resist.Y)/ MASS + YGRAVITY);

// compute new velocity

dots[i].dx += (DELTAT * accel.X);

dots[i].dy += (DELTAT * accel.Y);

// stop dead so it doesn't jitter when nearly still

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;

}

// move to new position

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

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

// get size of window

var height, width;

if (isNetscape) {

height = window.innerHeight + window.pageYOffset;

width = window.innerWidth + window.pageXOffset;

} else {

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

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

}

// bounce off 3 walls (leave ceiling open)

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;

}

// move img to new position

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

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

}

}

// end code hiding --

/script.

/body

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