VUE实现一个Flappy Bird游戏的示例代码

let rafId = null; // requestAnimationFrame的ID
let startSpeed = 1;
const SPEED = 0.04; // 加速度
const UP = 5.0; // 速度累加上限
const UP_SUM = 30; // 按一次跳跃的高度
const BIRD_WIDTH = 50; // 小鸟图片宽50px
const PIPE_DISTANCE = 350; // 管道之间的横向距离
let id = 0; // 管道唯一id，从0开始计数
 
...
 
data() {
    return {
      start: false,
      clientWidth: 0,
      clientHeight: 0,
      spaceHeight: [240, 200, 160], // 上管道与下管道之间的距离
      pipeArr: [], // 管道数组
      score: 0, // 得分
      jumpSum: 0, // 当前跳跃相对高度
      jumpFlag: false, // true-按下空格键跳跃上升阶段；false-自由落体阶段
      dropBirdImg: require("@/assets/img/bird/bird0_0.png"),
      flyBirdImg: require("@/assets/img/bird/bird0_2.png"),
      gameOver: false, // 游戏失败的flag，用于停止动画帧
    };
},

<div class="bird" id="bird" ref="bird"></div>
 
 #bird {
      height: 50px;
      width: 50px;
      border-radius: 50%;
      background: url("~assets/img/bird/bird0_1.png") no-repeat center/contain;
      // 小鸟初始位置
      position: absolute;
      left: 300px;
      top: 300px;
}

loop() {
      let _this = this;
      if (_this.jumpFlag) {
        // 小鸟跳跃
        _this.jump();
      }
      let top = _this.$refs.bird.offsetTop;
      if (top > _this.clientHeight - BIRD_WIDTH || top <= 0) {
        // 碰到边界，游戏结束
        _this.resetGame();
      } else if (!_this.jumpFlag) {
        _this.$refs.bird.style.background = `url('${_this.dropBirdImg}') no-repeat center/contain`;
        _this.$refs.bird.style.top = top + startSpeed * startSpeed + "px"; // 模拟加速坠落
        if (startSpeed < UP) {
          startSpeed += SPEED;
        }
      }
      _this.pipesMove(); // 管道移动
}

jump() {
      let _this = this;
      _this.$refs.bird.style.background = `url('${_this.flyBirdImg}') no-repeat center/contain`;
      if (_this.jumpSum > UP_SUM) {
        // 到顶部就落下
        _this.jumpFlag = false;
        _this.jumpSum = 0;
        startSpeed = 1;
      } else {
        _this.$refs.bird.style.top = _this.$refs.bird.offsetTop - 8 + "px";
        _this.jumpSum += 8;
      }
}

animation: bgMove 8s linear infinite;
      @keyframes bgMove {
        0% {
          background-position: 805px 0;
        }
        100% {
          background-position: 0 0;
        }
}

addPipe(id) {
      let obj = {};
      let top_num = this.sum(10, 170);
      let height = this.spaceHeight[
        Math.floor(Math.random() * this.spaceHeight.length)
      ]; // 随机选取间隙值
      let bottom_num = height - top_num;
      obj.top = top_num;
      obj.id = id;
      obj.right = -(PIPE_DISTANCE / 2);
      obj.bottom = bottom_num;
      this.pipeArr.push(obj);
},
sum(m, n) {
      // 随机n-m之间的数字
      return Math.floor(Math.random() * (m - n) + n);
}

pipesMove() {
      let _this = this;
      if (_this.pipeArr.length === 0) {
        return;
      }
      let right0 = _this.pipeArr[0].right;
      if (right0 > this.clientWidth + 300) {
        this.pipeArr.shift();
      }
      let right_last = _this.pipeArr[_this.pipeArr.length - 1].right;
      if (right_last >= PIPE_DISTANCE / 2) {
        id++;
        this.addPipe(id);
      }
      for (let i = 0; i < _this.pipeArr.length; i++) {
        // 判断一下小鸟是否接触到了管道，小鸟50*50，left：300px；管道宽100px；管道进入范围right是width-450到width-300
        if (
          _this.pipeArr[i].right >= _this.clientWidth - 450 &&
          _this.pipeArr[i].right <= _this.clientWidth - 300
        ) {
          // 该管道进入了小鸟触碰范围
          let bird_top = _this.$refs.bird.offsetTop;
          // 12是小鸟图片素材上下有空白间隙
          if (
            bird_top <= _this.clientHeight / 2 - _this.pipeArr[i].top - 12 ||
            bird_top >=
              _this.clientHeight / 2 + _this.pipeArr[i].bottom - BIRD_WIDTH + 12
          ) {
            // 碰到了管道
            _this.resetGame();
            return;
          }
        }
        if (_this.pipeArr[i].right === _this.clientWidth - 300 && _this.pipeArr[i].right === _this.clientWidth - 301) { // 当某个管道刚好在小鸟左边，证明小鸟通过该管道，根据管道id算出小鸟得分
          _this.score = _this.pipeArr[i].id + 1;
        }
        _this.pipeArr[i].right = _this.pipeArr[i].right + 2; // 管道每帧移动2px
      }
}

<section class="pipes-wrap" ref="pipes">
          <div
            class="pipe-item"
            v-for="(item, index) in pipeArr"
            :key="item.id"
            :id="'pipe' + index"
            :style="'right:' + item.right + 'px;'"
          >
            <div
              class="pipe pipe-top"
              :style="'top:-' + item.top + 'px;'"
            ></div>
            <div
              class="pipe pipe-bottom"
              :style="'bottom:-' + item.bottom + 'px;'"
            ></div>
          </div>
</section>
 
.pipes-wrap {
        position: relative;
        height: 100%;
        overflow: hidden;
        .pipe-item {
          position: absolute;
          height: 100%;
          width: 100px;
          .pipe {
            width: 100%;
            height: 50%;
            position: relative;
          }
          .pipe-top {
            background: url('"~assets/img/bird/pipe_down.png') no-repeat;
            background-size: 100px;
            background-position: bottom;
          }
          .pipe-bottom {
            background: url('"~assets/img/bird/pipe_up.png') no-repeat;
            background-size: 100px;
            background-position: top;
          }
        }
}