我在这个网站上有他的效果 http://www.immersive-garden.com/ 有这个光点，在悬停时你会得到背景，我想要类似的东西而不使用闪光灯这是我正在使用的脚本现在
/*
Particle Emitter JavaScript Library
Version 0.3
by Erik Friend
Creates a circular particle emitter of specified radius centered and offset at specified screen location. Particles appear outside of emitter and travel outward at specified velocity while fading until disappearing in specified decay time. Particle size is specified in pixels. Particles reduce in size toward 1px as they decay. A custom image(s) may be used to represent particles. Multiple images will be cycled randomly to create a mix of particle types.
example:
var emitter = new particle_emitter({
image: ['resources/particle.white.gif', 'resources/particle.black.gif'],
center: ['50%', '50%'], offset: [0, 0], radius: 0,
size: 6, velocity: 40, decay: 1000, rate: 10
}).start();
*/
particle_emitter = function (opts) {
// DEFAULT VALUES
var defaults = {
center: ['50%', '50%'], // center of emitter (x / y coordinates)
offset: [0, 0], // offset emitter relative to center
radius: 0, // radius of emitter circle
image: 'particle.gif', // image or array of images to use as particles
size: 1, // particle diameter in pixels
velocity: 10, // particle speed in pixels per second
decay: 500, // evaporation rate in milliseconds
rate: 10 // emission rate in particles per second
};
// PASSED PARAMETER VALUES
var _options = $.extend({}, defaults, opts);
// CONSTRUCTOR
var _timer, _margin, _distance, _interval, _is_chrome = false;
(function () {
// Detect Google Chrome to avoid alpha transparency clipping bug when adjusting opacity
if (navigator.userAgent.indexOf('Chrome') >= 0) _is_chrome = true;
// Convert particle size into emitter surface margin (particles appear outside of emitter)
_margin = _options.size / 2;
// Convert emission velocity into distance traveled
_distance = _options.velocity * (_options.decay / 1000);
// Convert emission rate into callback interval
_interval = 1000 / _options.rate;
})();
// PRIVATE METHODS
var _sparkle = function () {
// Pick a random angle and convert to radians
var rads = (Math.random() * 360) * (Math.PI / 180);
// Starting coordinates
var sx = parseInt((Math.cos(rads) * (_options.radius + _margin)) + _options.offset[0] - _margin);
var sy = parseInt((Math.sin(rads) * (_options.radius + _margin)) + _options.offset[1] - _margin);
// Ending Coordinates
var ex = parseInt((Math.cos(rads) * (_options.radius + _distance + _margin + 0.5)) + _options.offset[0] - 0.5);
var ey = parseInt((Math.sin(rads) * (_options.radius + _distance + _margin + 0.5)) + _options.offset[1] - 0.5);
// Pick from available particle images
var image;
if (typeof(_options.image) == 'object') image = _options.image[Math.floor(Math.random() * _options.image.length)];
else image = _options.image;
// Attach sparkle to page, then animate movement and evaporation
var s = $('<img>')
.attr('src', image)
.css({
zIndex: 10,
position: 'absolute',
width: _options.size + 'px',
height: _options.size + 'px',
left: _options.center[0],
top: _options.center[1],
marginLeft: sx + 'px',
marginTop: sy + 'px'
})
.appendTo('body')
.animate({
width: '1px',
height: '1px',
marginLeft: ex + 'px',
marginTop: ey + 'px',
opacity: _is_chrome ? 1 : 0
}, _options.decay, 'linear', function () { $(this).remove(); });
// Spawn another sparkle
_timer = setTimeout(function () { _sparkle(); }, _interval);
};
// PUBLIC INTERFACE
// This is what gets returned by "new particle_emitter();"
// Everything above this point behaves as private thanks to closure
return {
start:function () {
clearTimeout(_timer);
_timer = setTimeout(function () { _sparkle(); }, 0);
return(this);
},
stop:function () {
clearTimeout(_timer);
return(this);
},
centerTo:function (x, y) {
_options.center[0] = x;
_options.center[1] = y;
},
offsetTo:function (x, y) {
if ((typeof(x) == 'number') && (typeof(y) == 'number')) {
_options.center[0] = x;
_options.center[1] = y;
}
}
}
};