这是一个基于canvas绘制的光标线条粒子组合动态网页背景效果。这个特效使用非常方便，使用原生的 javascript，不依赖任何框架或者内库，包括不依赖jQuery，非常容易实现。
特效如图：
把如下js代码引入即可实现上图效果：
! function (){ function n(n,e,t){ return n.getAttribute(e)||t} function e(n){ return document.getElementsByTagName(n)} function t(){ var t=e( "script" ),o=t.length,i=t[o-1]; return {l:o,z:n(i, "zIndex" ,-1),o:n(i, "opacity" ,.5),c:n(i, "color" , "0,0,0" ),n:n(i, "count" ,99)}} function o(){a=m.width=window.innerWidth||document.documentElement.clientWidth||document.body.clientWidth,c=m.height=window.innerHeight||document.documentElement.clientHeight||document.body.clientHeight} function i(){r.clearRect(0,0,a,c); var n,e,t,o,m,l;s.forEach( function (i,x){ for (i.x+=i.xa,i.y+=i.ya,i.xa*=i.x>a||i.x<0?-1:1,i.ya*=i.y>c||i.y<0?-1:1,r.fillRect(i.x-.5,i.y-.5,1,1),e=x+1;e<u.length;e++)n=u[e], null !==n.x&& null !==n.y&&(o=i.x-n.x,m=i.y-n.y,l=o*o+m*m,l<n.max&&(n===y&&l>=n.max/2&&(i.x-=.03*o,i.y-=.03*m),t=(n.max-l)/n.max,r.beginPath(),r.lineWidth=t/2,r.strokeStyle= "rgba(" +d.c+ "," +(t+.2)+ ")" ,r.moveTo(i.x,i.y),r.lineTo(n.x,n.y),r.stroke()))}),x(i)} var a,c,u,m=document.createElement( "canvas" ),d=t(),l= "c_n" +d.l,r=m.getContext( "2d" ),x=window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame|| function (n){window.setTimeout(n,1e3/45)},w=Math.random,y={x: null ,y: null ,max:2e4};m.id=l,m.style.cssText= "position:fixed;top:0;left:0;z-index:" +d.z+ ";opacity:" +d.o,e( "body" )[0].appendChild(m),o(),window.onresize=o,window.onmousemove= function (n){n=n||window.event,y.x=n.clientX,y.y=n.clientY},window.onmouseout= function (){y.x= null ,y.y= null }; for ( var s=[],f=0;d.n>f;f++){ var h=w()*a,g=w()*c,v=2*w()-1,p=2*w()-1;s.push({x:h,y:g,xa:v,ya:p,max:6e3})}u=s.concat([y]),setTimeout( function (){i()},100)}();
未压缩版以方便查看：
! function () {
//封装方法，压缩之后减少文件大小
function get_attribute(node, attr, default_value) {
return node.getAttribute(attr) || default_value;
}
//封装方法，压缩之后减少文件大小
function get_by_tagname(name) {
return document.getElementsByTagName(name);
}
//获取配置参数
function get_config_option() {
var scripts = get_by_tagname( "script" ),
script_len = scripts.length,
script = scripts[script_len - 1]; //当前加载的script
return {
l: script_len, //长度，用于生成id用
z: get_attribute(script, "zIndex" , -1), //z-index
o: get_attribute(script, "opacity" , 0.5), //opacity
c: get_attribute(script, "color" , "0,0,0" ), //color
n: get_attribute(script, "count" , 99) //count
};
}
//设置canvas的高宽
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);
//随机的线条和当前位置联合数组
var all_array = [current_point].concat(random_lines);
var e, i, d, x_dist, y_dist, dist; //临时节点
//遍历处理每一个点
random_lines.forEach( function (r) {
r.x += r.xa,
r.y += r.ya, //移动
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，反向反弹
context.fillRect(r.x - 0.5, r.y - 0.5, 1, 1); //绘制一个宽高为1的点
for (i = 0; i < all_array.length; i++) {
e = all_array[i];
//不是当前点
if (r !== e && null !== e.x && null !== e.y) {
x_dist = r.x - e.x, //x轴距离 l
y_dist = r.y - e.y, //y轴距离 n
dist = x_dist * x_dist + y_dist * y_dist; //总距离, m
dist < e.max && (e === current_point && dist >= e.max / 2 && (r.x -= 0.03 * x_dist, r.y -= 0.03 * y_dist), //靠近的时候加速
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，并添加到body中
var the_canvas = document.createElement( "canvas" ), //画布
config = get_config_option(), //配置
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 , //当前鼠标x
y: null , //当前鼠标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);
//初始化画布大小
set_canvas_size(), window.onresize = set_canvas_size;
//当时鼠标位置存储，离开的时候，释放当前位置信息
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 ;
};
//随机生成config.n条线位置信息
for ( var random_lines = [], i = 0; config.n > i; i++) {
var x = random() * canvas_width, //随机位置
y = random() * canvas_height,
xa = 2 * random() - 1, //随机运动方向
ya = 2 * random() - 1;
random_lines.push({
x: x,
y: y,
xa: xa,
ya: ya,
max: 6000 //沾附距离
});
}
//0.1秒后绘制
setTimeout( function () {
draw_canvas();
}, 100);
}();
本文作者：酷酷的二货
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已用，感谢
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