
Tạo hình nền tối với CSS
<style>
body { background-color:#222;}
</style>
Tạo các hạt phân tử bằng Javascript
<script type="text/javascript" color="255,255,255" opacity='0.7' zIndex="-2" count="300" src="canvas-nest.js"></script>
Nội dung đoạn JS canvas-nest.js
! function() {
//å°è£…方法,å‹ç¼©ä¹‹åå‡å°‘文件大å°
function get_attribute(node, attr, default_value) {
return node.getAttribute(attr) || default_value
}
//å°è£…方法,å‹ç¼©ä¹‹åå‡å°‘文件大å°
function get_by_tagname(name) {
return document.getElementsByTagName(name)
}
//è·å–é…ç½®å‚æ•°
function get_config_option() {
var scripts = get_by_tagname("script"),
script_len = scripts.length,
script = scripts[script_len - 1]; //当å‰å è½½ç„script
return {
l: script_len, //长度,用äºç”Ÿæˆid用
z: get_attribute(script, "zIndex", -1), //z-index
o: get_attribute(script, "opacity", .5), //opacity
c: get_attribute(script, "color", "0,0,0"), //color
n: get_attribute(script, "count", 99) //count
}
}
//设置canvasç„高宽
function set_canvas_size() {
canvas_width = the_canvas.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
canvas_height = the_canvas.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight
}
//绘制过程
function draw_canvas() {
context.clearRect(0, 0, canvas_width, canvas_height);
//éæœºç„线æ¡å’Œå½“å‰ä½ç½®è”åˆæ•°ç»„
var all_array = [current_point].concat(random_lines);
var e, i, d, x_dist, y_dist, dist; //临时è‚点
//éå†å¤„ç†æ¯ä¸€ä¸ªç‚¹
random_lines.forEach(function(r) {
r.x += r.xa,
r.y += r.ya, //ç§»å¨
r.xa *= r.x > canvas_width || r.x < 0 ? -1 : 1,
r.ya *= r.y > canvas_height || r.y < 0 ? -1 : 1, //碰到边界,åå‘åå¼¹
context.fillRect(r.x - 0.5, r.y - 0.5, 1, 1); //绘制一个宽高为1ç„点
for (i = 0; i < all_array.length; i++) {
e = all_array[i];
//䏿˜¯å½“å‰ç‚¹
if (r !== e && null !== e.x && null !== e.y) {
x_dist = r.x - e.x, //xè½´è·ç¦» l
y_dist = r.y - e.y, //yè½´è·ç¦» n
dist = x_dist * x_dist + y_dist * y_dist; //总è·ç¦», m
dist < e.max && (e === current_point && dist >= e.max / 2 && (r.x -= 0.03 * x_dist, r.y -= 0.03 * y_dist), //é è¿‘ç„æ—¶å€™å 速
d = (e.max - dist) / e.max,
context.beginPath(),
context.lineWidth = d / 2,
context.strokeStyle = "rgba(" + config.c + "," + (d + 0.2) + ")",
context.moveTo(r.x, r.y),
context.lineTo(e.x, e.y),
context.stroke())
}
}
all_array.splice(all_array.indexOf(r), 1)
}), frame_func(draw_canvas)
}
//创建画布,并添å 到bodyä¸
var the_canvas = document.createElement("canvas"), //画布
config = get_config_option(), //é…ç½®
canvas_id = "c_n" + config.l, //canvas id
context = the_canvas.getContext("2d"), canvas_width, canvas_height,
frame_func = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(func) {
window.setTimeout(func, 1000 / 45)
}, random = Math.random,
current_point = {
x: null, //当å‰é¼ æ ‡x
y: null, //当å‰é¼ æ ‡y
max: 20000
};
the_canvas.id = canvas_id;
the_canvas.style.cssText = "position:fixed;top:0;left:0;z-index:" + config.z + ";opacity:" + config.o;
get_by_tagname("body")[0].appendChild(the_canvas);
//åˆå§‹åŒ–画布大å°
set_canvas_size(), window.onresize = set_canvas_size;
//å½“æ—¶é¼ æ ‡ä½ç½®å˜å‚¨ï¼Œç¦»å¼€ç„æ—¶å€™ï¼Œé‡æ”¾å½“å‰ä½ç½®ä¿¡æ¯
window.onmousemove = function(e) {
e = e || window.event, current_point.x = e.clientX, current_point.y = e.clientY
}, window.onmouseout = function() {
current_point.x = null, current_point.y = null
}
//éæœºç”Ÿæˆconfig.næ¡çº¿ä½ç½®ä¿¡æ¯
for (var random_lines = [], i = 0; config.n > i; i++) {
var x = random() * canvas_width, //éæœºä½ç½®
y = random() * canvas_height,
xa = 2 * random() - 1, //éæœºè¿å¨æ–¹å‘
ya = 2 * random() - 1;
random_lines.push({
x: x,
y: y,
xa: xa,
ya: ya,
max: 6000 //沾附è·ç¦»
})
}
//0.1ç§’å绘制
setTimeout(function() {
draw_canvas()
}, 100)
}();
Cảm ơn đã theo dõi và chúc bạn thành công! ./.Nguồn: cssscript.com