图片效果预览：

原码如下：

<script type="text/javascript">
BLUR = false;

PULSATION = true;
PULSATION_PERIOD = 600;
PARTICLE_RADIUS = 4;

/* disable blur before using blink */

BLINK = false;

GLOBAL_PULSATION = false;

QUALITY = 2; /* 0 - 5 */

/* set false if you prefer rectangles */
ARC = true;

/* trembling + blur = fun */
TREMBLING = 0; /* 0 - infinity */

FANCY_FONT = "Arial";

BACKGROUND = "#000";

BLENDING = true;

/* if empty the text will be a random number */
var TEXT;
num = 0;
TEXTArray = ["森林", "森林", "之家", "之家", "之家"];

QUALITY_TO_FONT_SIZE = [10, 12, 40, 50, 100, 350];
QUALITY_TO_SCALE = [20, 6, 4, 2, 0.9, 0.5];
QUALITY_TO_TEXT_POS = [10, 20, 60, 100, 370, 280];


window.onload = function () {
 document.body.style.backgroundColor = BACKGROUND;

 var canvas = document.getElementById("canvas");
 var ctx = canvas.getContext("2d");

 var W = canvas.width;
 var H = canvas.height;

 var tcanvas = document.createElement("canvas");
 var tctx = tcanvas.getContext("2d");
 tcanvas.width = W;
 tcanvas.height = H;

 total_area = W * H;
 total_particles = 928;
 single_particle_area = total_area / total_particles;
 area_length = Math.sqrt(single_particle_area);

 var particles = [];
 for (var i = 1; i <= total_particles; i++) {
 particles.push(new particle(i));
 }

 function particle(i) {
 this.r = Math.round(Math.random() * 255 | 0);
 this.g = Math.round(Math.random() * 255 | 0);
 this.b = Math.round(Math.random() * 255 | 0);
 this.alpha = 1;

 this.x = (i * area_length) % W;
 this.y = (i * area_length) / W * area_length;

 /* randomize delta to make particles sparkling */
 this.deltaOffset = Math.random() * PULSATION_PERIOD | 0;

 this.radius = 0.1 + Math.random() * 2;
 }

 var positions = [];

 function new_positions() {

 TEXT = TEXTArray[num];

 if (num < TEXTArray.length - 1) {
 num++;
 } else {
 num = 0;
 }
 //alert(TEXT);

 tctx.fillStyle = "white";
 tctx.fillRect(0, 0, W, H)
 //tctx.fill();

 tctx.font = "bold " + QUALITY_TO_FONT_SIZE[QUALITY] + "px " + FANCY_FONT;

 //tctx.textAlign='center';//文本水平对齐方式
 //tctx.textBaseline='middle';

 //tctx.strokeStyle = "black";
 tctx.fillStyle = "#f00";
 //tctx.strokeText(TEXT,30, 50);
 tctx.fillText(TEXT, 20, 60);

 image_data = tctx.getImageData(0, 0, W, H);
 pixels = image_data.data;
 positions = [];
 for (var i = 0; i < pixels.length; i = i + 2) {
 if (pixels[i] != 255) {
 position = {
 x: (i / 2 % W | 0) * QUALITY_TO_SCALE[QUALITY] | 0,
 y: (i / 2 / W | 0) * QUALITY_TO_SCALE[QUALITY] | 0
 }
 positions.push(position);
 }
 }

 get_destinations();
 }

 function draw() {

 var now = Date.now();

 ctx.globalCompositeOperation = "source-over";

 if (BLUR) ctx.globalAlpha = 0.1;
 else if (!BLUR && !BLINK) ctx.globalAlpha = 1.0;

 ctx.fillStyle = BACKGROUND;
 ctx.fillRect(0, 0, W, H)

 if (BLENDING) ctx.globalCompositeOperation = "lighter";

 for (var i = 0; i < particles.length; i++) {

 p = particles[i];

 /* in lower qualities there is not enough full pixels for all of them - dirty hack*/

 if (isNaN(p.x)) continue

 ctx.beginPath();
 ctx.fillStyle = "rgb(" + p.r + ", " + p.g + ", " + p.b + ")";
 ctx.fillStyle = "rgba(" + p.r + ", " + p.g + ", " + p.b + ", " + p.alpha + ")";

 if (BLINK) ctx.globalAlpha = Math.sin(Math.PI * mod * 1.0);

 if (PULSATION) { /* this would be 0 -> 1 */
 var mod = ((GLOBAL_PULSATION ? 0 : p.deltaOffset) + now) % PULSATION_PERIOD / PULSATION_PERIOD;

 /* lets make the value bouncing with sinus */
 mod = Math.sin(mod * Math.PI);
 } else var mod = 1;

 var offset = TREMBLING ? TREMBLING * (-1 + Math.random() * 2) : 0;

 var radius = PARTICLE_RADIUS * p.radius;

 if (!ARC) {
 ctx.fillRect(offset + p.x - mod * radius / 2 | 0, offset + p.y - mod * radius / 2 | 0, radius * mod,
 radius * mod);
 } else {
 ctx.arc(offset + p.x | 0, offset + p.y | 0, radius * mod, Math.PI * 2, false);
 ctx.fill();
 }

 p.x += (p.dx - p.x) / 10;
 p.y += (p.dy - p.y) / 10;
 }
 }

 function get_destinations() {
 for (var i = 0; i < particles.length; i++) {
 pa = particles[i];
 particles[i].alpha = 1;
 var distance = [];
 nearest_position = 0;
 if (positions.length) {
 for (var n = 0; n < positions.length; n++) {
 po = positions[n];
 distance[n] = Math.sqrt((pa.x - po.x) * (pa.x - po.x) + (pa.y - po.y) * (pa.y - po.y));
 if (n > 0) {
 if (distance[n] <= distance[nearest_position]) {
 nearest_position = n;
 }
 }
 }
 particles[i].dx = positions[nearest_position].x;
 particles[i].dy = positions[nearest_position].y;
 particles[i].distance = distance[nearest_position];

 var po1 = positions[nearest_position];
 for (var n = 0; n < positions.length; n++) {
 var po2 = positions[n];
 distance = Math.sqrt((po1.x - po2.x) * (po1.x - po2.x) + (po1.y - po2.y) * (po1.y - po2.y));
 if (distance <= 5) {
 positions.splice(n, 1);
 }
 }
 } else {
 //particles[i].alpha = 0;
 }
 }
 }

 function init() {
 new_positions();
 setInterval(draw, 30);
 setInterval(new_positions, 2000);
 }

 init();
};
</script>

<style type="text/css">
body {
 background: #000;
 text-align: center;
 font-family: "simhei"
}
canvas {
 margin: auto;
 position: absolute;
 left: 0;
 right:0;
 top: 0;
 bottom: 0;
}
</style>


<canvas id="canvas" width="1000" height="800"></canvas>

<div style="text-align:center;">
<p><a href="" title="" target="_blank"></a></p>
</div>