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博客园页脚html代码,博客园页脚动态背景代码

作者:互联网

Title

!function() {//封装方法,压缩之后减少文件大小

functionget_attribute(node, attr, default_value) {returnnode.getAttribute(attr)||default_value;

}//封装方法,压缩之后减少文件大小

functionget_by_tagname(name) {returndocument.getElementsByTagName(name);

}//获取配置参数

functionget_config_option() {varscripts=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",0.8),//opacity

c: get_attribute(script,"color","255,255,255"),//color

n: get_attribute(script,"count",350)//count

};

}//设置canvas的高宽

functionset_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

functiondraw_canvas() {

context.clearRect(0,0, canvas_width, canvas_height);//随机的线条和当前位置联合数组

vare, i, d, x_dist, y_dist, dist;//临时节点

//遍历处理每一个点

random_points.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

e=all_array[i];//当前点存在

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/ 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= "#555555",//这里是线条的颜色

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

varthe_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 / 40);

}, random=Math.random,

current_point={

x:null,//当前鼠标x

y:null,//当前鼠标y

max:20000 //圈半径的平方

},

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.οnresize=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.οnmοusemοve= function(e) {

e=e||window.event;

current_point.x=e.clientX;

current_point.y=e.clientY;

}, window.οnmοuseοut= function() {

current_point.x= null;

current_point.y= null;

};//随机生成config.n条线位置信息

for(varrandom_points=[], i= 0; config.n>i; i++) {varx=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;//随机点

random_points.push({

x: x,

y: y,

xa: xa,

ya: ya,

max:6000 //沾附距离

});

}

all_array=random_points.concat([current_point]);//0.1秒后绘制

setTimeout(function() {

draw_canvas();

},100);

}();

标签:canvas,random,dist,页脚,博客园,script,window,context,代码
来源: https://www.cnblogs.com/aixuexi666888/p/15509836.html