网页动态背景，光点连接

<!DOCTYPE html>

<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <meta name="robots" content="noindex">
  <title>io-fx03</title>
    <meta name="author" content="iowen.cn">
  
<script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script>

  <style>
    html, body { background: #1B1D1F; margin: 0; padding:0;}
    canvas { width: 100%; height: 100%; position: absolute; }
  </style>
</head>
<body>
  <canvas width="1920" height="1040"></canvas>
  <script>
    $(function(){
      var canvas = document.querySelector('canvas'),
          ctx = canvas.getContext('2d')
      canvas.width = window.innerWidth;
      canvas.height = window.innerHeight;
      ctx.lineWidth = .3;
      ctx.strokeStyle = (new Color(150)).style;
    
      var mousePosition = {
        x: 30 * canvas.width / 100,
        y: 30 * canvas.height / 100
      };
    
      var dots = {
        nb: 150,
        distance: 50,
        d_radius: 100,
        array: []
      };
    
      function colorValue(min) {
        return Math.floor(Math.random() * 255 + min);
      }

      function createColorStyle(r,g,b) {
        return 'rgba(' + r + ',' + g + ',' + b + ', 0.8)';
      }

      function mixComponents(comp1, weight1, comp2, weight2) {
        return (comp1 * weight1 + comp2 * weight2) / (weight1 + weight2);
      }

      function averageColorStyles(dot1, dot2) {
        var color1 = dot1.color,
            color2 = dot2.color;

        var r = mixComponents(color1.r, dot1.radius, color2.r, dot2.radius),
            g = mixComponents(color1.g, dot1.radius, color2.g, dot2.radius),
            b = mixComponents(color1.b, dot1.radius, color2.b, dot2.radius);
        return createColorStyle(Math.floor(r), Math.floor(g), Math.floor(b));
      }

      function Color(min) {
        min = min || 0;
        this.r = colorValue(min);
        this.g = colorValue(min);
        this.b = colorValue(min);
        this.style = createColorStyle(this.r, this.g, this.b);
      }
    
      function Dot(){
        this.x = Math.random() * canvas.width;
        this.y = Math.random() * canvas.height;
      
        this.vx = -.5 + Math.random();
        this.vy = -.5 + Math.random();
      
        this.radius = Math.random() * 2;
      
        this.color = new Color();
        //console.log(this);
      }
    
      Dot.prototype = {
        draw: function(){
          ctx.beginPath();
          ctx.fillStyle = this.color.style;
          ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
          ctx.fill();
        }
      };
    
      function createDots(){
        for(i = 0; i < dots.nb; i++){
          dots.array.push(new Dot());
        }
      }
    
      function moveDots() {
        for(i = 0; i < dots.nb; i++){
        
          var dot = dots.array[i];
        
          if(dot.y < 0 || dot.y > canvas.height){
            dot.vx = dot.vx;
            dot.vy = - dot.vy;
          }
          else if(dot.x < 0 || dot.x > canvas.width){
            dot.vx = - dot.vx;
            dot.vy = dot.vy;
          }
          dot.x += dot.vx;
          dot.y += dot.vy;
        }
      }
    
      function connectDots() {
        for(i = 0; i < dots.nb; i++){
          for(j = 0; j < dots.nb; j++){
            i_dot = dots.array[i];
            j_dot = dots.array[j];
          
            if((i_dot.x - j_dot.x) < dots.distance && (i_dot.y - j_dot.y) < dots.distance && (i_dot.x - j_dot.x) > - dots.distance && (i_dot.y - j_dot.y) > - dots.distance){
              if((i_dot.x - mousePosition.x) < dots.d_radius && (i_dot.y - mousePosition.y) < dots.d_radius && (i_dot.x - mousePosition.x) > - dots.d_radius && (i_dot.y - mousePosition.y) > - dots.d_radius){
                ctx.beginPath();
                ctx.strokeStyle = averageColorStyles(i_dot, j_dot);
                ctx.moveTo(i_dot.x, i_dot.y);
                ctx.lineTo(j_dot.x, j_dot.y);
                ctx.stroke();
                ctx.closePath();
              }
            }
          }
        }
      }
    
      function drawDots() {
        for(i = 0; i < dots.nb; i++){
          var dot = dots.array[i];
          dot.draw();
        }
      }
    
      function animateDots() {
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        moveDots();
        connectDots();
        drawDots();
      
        requestAnimationFrame(animateDots);    
      }
    
      $('canvas').on('mousemove', function(e){
        mousePosition.x = e.pageX;
        mousePosition.y = e.pageY;
      });
    
      $('canvas').on('mouseleave', function(e){
        mousePosition.x = canvas.width / 2;
        mousePosition.y = canvas.height / 2;
      });
    
      createDots();
      requestAnimationFrame(animateDots);    
    });
  </script>
  
</body>
</html>