vue背景悬浮动画

loginAnimation.js

const animation  =()=> {
    //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", 1), //opacity
        c: get_attribute(script, "color", "0,0,0"), //color
        n: get_attribute(script, "count", 100), //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_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 + 0.9) + ")"),
              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);
  }
  export default animation

demo.vue引入

<script>
import animation from "./loginAnimation.js";
export default {
  data() {
    return {};
  },
  created() {
    animation();
  },
  methods: {
  },
};
</script>