【前端背景UI】鼠标磁性动态蜘蛛网背景源码

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    //获取配置参数
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            z: get_attribute(script,zIndexindex
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    //绘制过程
    function draw_canvas() {
        context.clearRect(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,1)">移动
            r.xa *= r.x > canvas_width || r.x < 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,1)">x轴距离 l
                        y_dist = r.y - e.y,1)">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),1)">靠近的时候加速
                        d = (e.max - dist) / e.max,context.beginPath(),context.lineWidth = d / 2rgba(" + config.c + " + (d + 0.2) + )创建画布，并添加到body中
    var the_canvas = document.createElement(canvas画布
        config = get_config_option(),1)">配置
        canvas_id = c_n" + config.l,1)">canvas id
        context = the_canvas.getContext(2d function(func) {
            window.setTimeout(func,1000 / 45);
        },random = Math.random,current_point = {
            x: null,1)">当前鼠标x
            y: null,1)">当前鼠标y
            max: 20000
        },all_array;
    the_canvas.id = canvas_id;
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    //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,1)"> 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,1)">随机位置
            y = random() * canvas_height,xa = 2 * random() - 1,1)">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);
}();
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