/**     * Copyright (c) 2016 hustcc     * License: MIT     * Version: %%GULP_INJECT_VERSION%%     * GitHub: https://github.com/hustcc/canvas-nest.js    **/    ! 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 e, 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 < all_array.length; 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 && (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 // 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.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_points = [], 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;        // 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);    }();

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