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蜘蛛丝网动态背景
发布时间:2018-07-09 14:44:45 已阅读:   
很多人应该都见过这种背景特效吧。
就是下图这种



然后这种样式代码现在给大家:

原文件:

我把源文件的代码放在下面,可以只复制代码粘贴到相应位置就好


<div style="float:right;" id="hub_iframe"></div>

<script type="text/javascript">

    function async_load() {

           

        i.scrolling = "no";

        i.frameborder = "0";

        i.border = "0";

        i.setAttribute("frameborder", "0", 0);

        i.width = "100px";

        i.height = "20px";

        document.getElementById("hub_iframe").appendChild(i);

    }

 

    if (window.addEventListener) {window.addEventListener("load", async_load, false);}

    else if (window.attachEvent) {window.attachEvent("onload", async_load);}

    else {window.onload = async_load;}

</script>

<script>

! 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", 200) //蜘蛛网数量

};

}

//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 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, idx) {

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

//从下一个点开始

for (i = idx + 1; i < all_array.length; i++) {

e = all_array[i];

//不是当前点

if (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());

}

}

}), 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

},

all_array;

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

});

}

all_array = random_lines.concat([current_point]);

//0.1秒后绘制

setTimeout(function() {

draw_canvas();

}, 100);

}();

</script>

<script type="text/javascript">
    function async_load() {
           
        i.scrolling = "no";
        i.frameborder = "0";
        i.border = "0";
        i.setAttribute("frameborder", "0", 0);
        i.width = "100px";
        i.height = "20px";
        document.getElementById("hub_iframe").appendChild(i);
    }
 
    if (window.addEventListener) {window.addEventListener("load", async_load, false);}
    else if (window.attachEvent) {window.attachEvent("onload", async_load);}
    else {window.onload = async_load;}
</script>
<script>
! 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", 200) //蜘蛛网数量
};
}
//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 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, idx) {
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
//从下一个点开始
for (i = idx + 1; i < all_array.length; i++) {
e = all_array[i];
//不是当前点
if (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());
}
}
}), 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
},
all_array;
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
});
}
all_array = random_lines.concat([current_point]);
//0.1秒后绘制
setTimeout(function() {
draw_canvas();
}, 100);
}();
</script>
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