先上效果图
烟花动效

代码如下：

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>
    </title>
    <!-- 引用本地jquery文件 -->
    <!-- <script src="../js/jquery-1.9.1.min.js"></script> -->
    <!-- 引用百度jquery文件 -->
    <script src="http://libs.baidu.com/jquery/2.1.4/jquery.min.js">
    </script>
    <style type="text/css">
      .divBody { position: absolute; top: 0; left: 0; width: 100%; height: 100%;
      background-color: #000000; font-family: "黑体"; color: #292929; } canvas
      { cursor: crosshair; display: block; left: 0; position: absolute; top:
      0; z-index: 20; }
    </style>
  </head>
  <body>
    <div class="divBody">
    </div>
    <canvas width="100%" height="100%">
    </canvas>
  </body>

</html>
<script>
  var Fireworks;
  $(function() {
    Fireworks = function() {
      var self = this;
      var rand = function(rMi, rMa) {
        return~~ ((Math.random() * (rMa - rMi + 1)) + rMi);
      }
      var hitTest = function(x1, y1, w1, h1, x2, y2, w2, h2) {
        return ! (x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);
      };
      window.requestAnimFrame = function() {
        return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
        function(a) {
          window.setTimeout(a, 1E3 / 60)
        }
      } ();

      self.init = function() {
        self.canvas = document.createElement('canvas');
        self.canvas.width = self.cw = $(window).innerWidth();
        self.canvas.height = self.ch = $(window).innerHeight();
        self.particles = [];
        self.partCount = 150;
        self.fireworks = [];
        self.mx = self.cw / 2;
        self.my = self.ch / 2;
        self.currentHue = 30;
        self.partSpeed = 5;
        self.partSpeedVariance = 10;
        self.partWind = 50;
        self.partFriction = 5;
        self.partGravity = 1;
        self.hueMin = 0;
        self.hueMax = 10; //单次最多释放个数
        self.fworkSpeed = 4;
        self.fworkAccel = 10;
        self.hueVariance = 30;
        self.flickerDensity = 25;
        self.showShockwave = true;
        self.showTarget = false;
        self.clearAlpha = 25;

        $(document.body).append(self.canvas);
        self.ctx = self.canvas.getContext('2d');
        self.ctx.lineCap = 'round';
        self.ctx.lineJoin = 'round';
        self.lineWidth = 1;
        self.bindEvents();
        self.canvasLoop();

        self.canvas.onselectstart = function() {
          return false;
        };
      };

      self.createParticles = function(x, y, hue) {
        var countdown = self.partCount;
        while (countdown--) {
          var newParticle = {
            x: x,
            y: y,
            coordLast: [{

              x: x,
              y: y
            },
            {
              x: x,
              y: y
            },
            {
              x: x,
              y: y
            }],
            angle: rand(0, 360),
            speed: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance, (self.partSpeed + self.partSpeedVariance)),
            friction: 1 - self.partFriction / 100,
            gravity: self.partGravity / 2,
            hue: rand(hue - self.hueVariance, hue + self.hueVariance),
            brightness: rand(50, 80),
            alpha: rand(40, 100) / 100,
            decay: rand(10, 50) / 1000,
            wind: (rand(0, self.partWind) - (self.partWind / 2)) / 25,
            lineWidth: self.lineWidth
          };
          self.particles.push(newParticle);
        }
      };

      self.updateParticles = function() {
        var i = self.particles.length;
        while (i--) {
          var p = self.particles[i];
          var radians = p.angle * Math.PI / 180;
          var vx = Math.cos(radians) * p.speed;
          var vy = Math.sin(radians) * p.speed;
          p.speed *= p.friction;

          p.coordLast[2].x = p.coordLast[1].x;
          p.coordLast[2].y = p.coordLast[1].y;
          p.coordLast[1].x = p.coordLast[0].x;
          p.coordLast[1].y = p.coordLast[0].y;
          p.coordLast[0].x = p.x;
          p.coordLast[0].y = p.y;

          p.x += vx;
          p.y += vy;
          p.y += p.gravity;

          p.angle += p.wind;
          p.alpha -= p.decay;

          if (!hitTest(0, 0, self.cw, self.ch, p.x - p.radius, p.y - p.radius, p.radius * 2, p.radius * 2) || p.alpha < .05) {
            self.particles.splice(i, 1);
          }
        };
      };

      self.drawParticles = function() {
        var i = self.particles.length;
        while (i--) {
          var p = self.particles[i];

          var coordRand = (rand(1, 3) - 1);
          self.ctx.beginPath();
          self.ctx.moveTo(Math.round(p.coordLast[coordRand].x), Math.round(p.coordLast[coordRand].y));
          self.ctx.lineTo(Math.round(p.x), Math.round(p.y));
          self.ctx.closePath();
          self.ctx.strokeStyle = 'hsla(' + p.hue + ', 100%, ' + p.brightness + '%, ' + p.alpha + ')';
          self.ctx.stroke();

          if (self.flickerDensity > 0) {
            var inverseDensity = 50 - self.flickerDensity;
            if (rand(0, inverseDensity) === inverseDensity) {
              self.ctx.beginPath();
              self.ctx.arc(Math.round(p.x), Math.round(p.y), rand(p.lineWidth, p.lineWidth + 3) / 2, 0, Math.PI * 2, false) self.ctx.closePath();
              var randAlpha = rand(50, 100) / 100;
              self.ctx.fillStyle = 'hsla(' + p.hue + ', 100%, ' + p.brightness + '%, ' + randAlpha + ')';
              self.ctx.fill();
            }
          }
        };
      };

      self.createFireworks = function(startX, startY, targetX, targetY) {
        var newFirework = {
          x: startX,
          y: startY,
          startX: startX,
          startY: startY,
          hitX: false,
          hitY: false,
          coordLast: [{
            x: startX,
            y: startY
          },
          {
            x: startX,
            y: startY
          },
          {
            x: startX,
            y: startY
          }],
          targetX: targetX,
          targetY: targetY,
          speed: self.fworkSpeed,
          angle: Math.atan2(targetY - startY, targetX - startX),
          shockwaveAngle: Math.atan2(targetY - startY, targetX - startX) + (90 * (Math.PI / 180)),
          acceleration: self.fworkAccel / 100,
          hue: self.currentHue,
          brightness: rand(50, 80),
          alpha: rand(50, 100) / 100,
          lineWidth: self.lineWidth
        };
        if (self.fireworks.length < self.hueMax) {
          self.fireworks.push(newFirework);
        }
      };

      self.updateFireworks = function() {
        var i = self.fireworks.length;

        while (i--) {
          var f = self.fireworks[i];
          self.ctx.lineWidth = f.lineWidth;

          vx = Math.cos(f.angle) * f.speed,
          vy = Math.sin(f.angle) * f.speed;
          f.speed *= 1 + f.acceleration;
          f.coordLast[2].x = f.coordLast[1].x;
          f.coordLast[2].y = f.coordLast[1].y;
          f.coordLast[1].x = f.coordLast[0].x;
          f.coordLast[1].y = f.coordLast[0].y;
          f.coordLast[0].x = f.x;
          f.coordLast[0].y = f.y;

          if (f.startX >= f.targetX) {
            if (f.x + vx <= f.targetX) {
              f.x = f.targetX;
              f.hitX = true;
            } else {
              f.x += vx;
            }
          } else {
            if (f.x + vx >= f.targetX) {
              f.x = f.targetX;
              f.hitX = true;
            } else {
              f.x += vx;
            }
          }

          if (f.startY >= f.targetY) {
            if (f.y + vy <= f.targetY) {
              f.y = f.targetY;
              f.hitY = true;
            } else {
              f.y += vy;
            }
          } else {
            if (f.y + vy >= f.targetY) {
              f.y = f.targetY;
              f.hitY = true;
            } else {
              f.y += vy;
            }
          }

          if (f.hitX && f.hitY) {
            self.createParticles(f.targetX, f.targetY, f.hue);
            self.fireworks.splice(i, 1);

          }
        };
      };

      self.drawFireworks = function() {
        var i = self.fireworks.length;
        self.ctx.globalCompositeOperation = 'lighter';
        while (i--) {
          var f = self.fireworks[i];
          self.ctx.lineWidth = f.lineWidth;

          var coordRand = (rand(1, 3) - 1);
          self.ctx.beginPath();
          self.ctx.moveTo(Math.round(f.coordLast[coordRand].x), Math.round(f.coordLast[coordRand].y));
          self.ctx.lineTo(Math.round(f.x), Math.round(f.y));
          self.ctx.closePath();
          self.ctx.strokeStyle = 'hsla(' + f.hue + ', 100%, ' + f.brightness + '%, ' + f.alpha + ')';
          self.ctx.stroke();

          if (self.showTarget) {
            self.ctx.save();
            self.ctx.beginPath();
            self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1, 8), 0, Math.PI * 2, false) self.ctx.closePath();
            self.ctx.lineWidth = 1;
            self.ctx.stroke();
            self.ctx.restore();
          }

          if (self.showShockwave) {
            self.ctx.save();
            self.ctx.translate(Math.round(f.x), Math.round(f.y));
            self.ctx.rotate(f.shockwaveAngle);
            self.ctx.beginPath();
            self.ctx.arc(0, 0, 1 * (f.speed / 5), 0, Math.PI, true);
            self.ctx.strokeStyle = 'hsla(' + f.hue + ', 100%, ' + f.brightness + '%, ' + rand(25, 60) / 100 + ')';
            self.ctx.lineWidth = f.lineWidth;
            self.ctx.stroke();
            self.ctx.restore();
          }
        };
      };

      self.bindEvents = function() {
        $(window).on('resize',
        function() {
          clearTimeout(self.timeout);
          self.timeout = setTimeout(function() {
            self.canvas.width = self.cw = $(window).innerWidth();
            self.canvas.height = self.ch = $(window).innerHeight();
            self.ctx.lineCap = 'round';
            self.ctx.lineJoin = 'round';
          },
          100);
        });
        //鼠标点击释放烟花
        $(self.canvas).on('mousedown',
        function(e) {
          self.mx = e.pageX - self.canvas.offsetLeft;
          self.my = e.pageY - self.canvas.offsetTop;
          self.currentHue = rand(self.hueMin, self.hueMax);
          self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);

          $(self.canvas).on('mousemove.fireworks',
          function(e) {
            self.mx = e.pageX - self.canvas.offsetLeft;
            self.my = e.pageY - self.canvas.offsetTop;
            self.currentHue = rand(self.hueMin, self.hueMax);
            self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);
          });
        });

        $(self.canvas).on('mouseup',
        function(e) {
          $(self.canvas).off('mousemove.fireworks');
        });

      }

      self.clear = function() {
        self.particles = [];
        self.fireworks = [];
        self.ctx.clearRect(0, 0, self.cw, self.ch);
      };

      self.canvasLoop = function() {
        requestAnimFrame(self.canvasLoop, self.canvas);
        self.ctx.globalCompositeOperation = 'destination-out';
        self.ctx.fillStyle = 'rgba(0,0,0,' + self.clearAlpha / 100 + ')';
        self.ctx.fillRect(0, 0, self.cw, self.ch);
        self.updateFireworks();
        self.updateParticles();
        self.drawFireworks();
        self.drawParticles();

      };

      self.testClick = function() {
        var eventX = randomNum(0, width);
        var eventY = randomNum(0, height);
        self.mx = eventX;
        self.my = eventY;
        self.currentHue = rand(self.hueMin, self.hueMax);
        self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);
      };

      self.setInterval = function() {
        setTimeout(function() {
          self.testClick();
          clearTimeout(self.timeout);
          setTimeout(function() {
            self.setInterval();
          },
          1000);
        },
        1000);
      };
      self.init();
      self.setInterval(); //PS:页面加载后自动执行
    }
    var fworks = new Fireworks();
  });

  var width = $(window).width();
  var height = $(window).height();
  //获取随机数 生成坐标
  function randomNum(minNum, maxNum) {
    switch (arguments.length) {
    case 1:
      return parseInt(Math.random() * minNum + 1, 10);
      break;
    case 2:
      return parseInt(Math.random() * (maxNum - minNum + 1) + minNum, 10);
      break;
    default:
      return 0;
      break;
    }
  }
</script>
最后修改：2022 年 07 月 20 日 04 : 11 PM
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