HTMLCSSJS页⾯蜘蛛⽹背景特效
1、实际效果
【】
2、⽰例代码
引⼊以下代码前，需引⼊JQuery，否则报错
<!--引⼊代码前，需引⼊JQuery-->
<div 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";
}
if(window.addEventListener){window.addEventListener("load", async_load,false);}
else if(window.attachEvent){window.attachEvent("onload", async_load);}
load = 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){
Attribute(attr)|| default_value;
}
//封装⽅法，压缩之后减少⽂件⼤⼩
function get_by_tagname(name){
ElementsByTagName(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",0.8),//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];
实现特效的代码js//不是当前点
//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.lineTo(e.x, e.y),
context.stroke());
}
}
}),frame_func(draw_canvas);
}
//创建画布，并添加到body中
var the_canvas = ateElement("canvas"),//画布
config =get_config_option(),//配置
canvas_id ="c_n"+ config.l,//canvas id
context = Context("2d"), canvas_width, canvas_height,
frame_func = questAnimationFrame || window.webkitRequestAnimationFrame || window.m
ozRequestAnimationFrame || window.oRequestA nimationFrame || 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(), size = set_canvas_size;
//当时⿏标位置存储，离开的时候，释放当前位置信息
e = e || window.event, current_point.x = e.clientX, current_point.y = e.clientY;
}, useout=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 = at([current_point]);
//0.1秒后绘制
setTimeout(function(){
draw_canvas();
},100);
}();
</script>
3、特别提⽰
代码⾮作者本⼈原创，是从⽹上整理所得。

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