vue倒计时组件

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倒计时vue组件

最近在项目中，有了倒计时的需求，于是结合vue自己写了一个组件，我们只需传入一个结束时间endtime，即可开启倒数计时，倒计时结束后，我们可以监听timeOver事件。

注意事项

  • 倒计时无缝滚动，安卓手机bug处理nextTick和 setTimeout
  • timeOver事件，最好判断下 是否传入的endtime 是不一样的，不然可能出现死循环
    本组件支持时、分、秒的倒计时，并实现了无缝滚动的效果。具体参看代码呀！
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<template>
  <div class="time">
    <!-- 小时 十位数 -->
    <div class="column" :class="{ animation: col1 }" ref="col1">
      <div class="num" :class="{ android: isArd }">0</div>
      <div class="num" :class="{ android: isArd }">1</div>
      <div class="num" :class="{ android: isArd }">2</div>
      <div class="num" :class="{ android: isArd }">3</div>
      <div class="num" :class="{ android: isArd }">4</div>
      <div class="num" :class="{ android: isArd }">5</div>
      <div class="num" :class="{ android: isArd }">6</div>
      <div class="num" :class="{ android: isArd }">7</div>
      <div class="num" :class="{ android: isArd }">8</div>
      <div class="num" :class="{ android: isArd }">9</div>
      <div class="num" :class="{ android: isArd }">0</div>
    </div>
    <!-- 小时各位数 -->
    <div class="column" :class="{ animation: col2 }" ref="col2">
      <div class="num" :class="{ android: isArd }">0</div>
      <div class="num" :class="{ android: isArd }">1</div>
      <div class="num" :class="{ android: isArd }">2</div>
      <div class="num" :class="{ android: isArd }">3</div>
      <div class="num" :class="{ android: isArd }">4</div>
      <div class="num" :class="{ android: isArd }">5</div>
      <div class="num" :class="{ android: isArd }">6</div>
      <div class="num" :class="{ android: isArd }">7</div>
      <div class="num" :class="{ android: isArd }">8</div>
      <div class="num" :class="{ android: isArd }">9</div>
      <div class="num" :class="{ android: isArd }">0</div>
    </div>
    <div class="colon"></div>
    <!-- 分钟十位 -->
    <div class="column" :class="{ animation: col3 }" ref="col3">
      <div class="num" :class="{ android: isArd }">0</div>
      <div class="num" :class="{ android: isArd }">1</div>
      <div class="num" :class="{ android: isArd }">2</div>
      <div class="num" :class="{ android: isArd }">3</div>
      <div class="num" :class="{ android: isArd }">4</div>
      <div class="num" :class="{ android: isArd }">5</div>
      <div class="num" :class="{ android: isArd }">0</div>
    </div>
    <!-- 分钟各位数 -->
    <div class="column" :class="{ animation: col4 }" ref="col4">
      <div class="num" :class="{ android: isArd }">0</div>
      <div class="num" :class="{ android: isArd }">1</div>
      <div class="num" :class="{ android: isArd }">2</div>
      <div class="num" :class="{ android: isArd }">3</div>
      <div class="num" :class="{ android: isArd }">4</div>
      <div class="num" :class="{ android: isArd }">5</div>
      <div class="num" :class="{ android: isArd }">6</div>
      <div class="num" :class="{ android: isArd }">7</div>
      <div class="num" :class="{ android: isArd }">8</div>
      <div class="num" :class="{ android: isArd }">9</div>
      <div class="num" :class="{ android: isArd }">0</div>
    </div>
    <div class="colon"></div>
    <!-- 秒钟十位数 -->
    <div class="column" :class="{ animation: col5 }" ref="col5">
      <div class="num" :class="{ android: isArd }">0</div>
      <div class="num" :class="{ android: isArd }">1</div>
      <div class="num" :class="{ android: isArd }">2</div>
      <div class="num" :class="{ android: isArd }">3</div>
      <div class="num" :class="{ android: isArd }">4</div>
      <div class="num" :class="{ android: isArd }">5</div>
      <div class="num" :class="{ android: isArd }">0</div>
    </div>
    <!-- 秒钟个位数 -->
    <div class="column" :class="{ animation: col6 }" ref="col6">
      <div class="num" :class="{ android: isArd }">0</div>
      <div class="num" :class="{ android: isArd }">1</div>
      <div class="num" :class="{ android: isArd }">2</div>
      <div class="num" :class="{ android: isArd }">3</div>
      <div class="num" :class="{ android: isArd }">4</div>
      <div class="num" :class="{ android: isArd }">5</div>
      <div class="num" :class="{ android: isArd }">6</div>
      <div class="num" :class="{ android: isArd }">7</div>
      <div class="num" :class="{ android: isArd }">8</div>
      <div class="num" :class="{ android: isArd }">9</div>
      <div class="num" :class="{ android: isArd }">0</div>
    </div>
  </div>
</template>
<script>
export default {
  name: "TimeClock",
  props: {
    activityInfo: {
      type: Object,
      default() {
        return {
          endTime: "",
          type: ""
        };
      }
    }
  },
  data() {
    return {
      fontSize: "0.26rem",
      nowTime: new Date(),
      classList: ["visible", "close", "far", "far", "distant", "distant"],
      lastEndtime: 0,
      timer: null,
      col1: true,
      col2: true,
      col3: true,
      col4: true,
      col5: true,
      col6: true,
      // 是否为安卓手机
      isArd: false
    };
  },
  watch: {
    activityInfo(val) {
      if (this.timer) {
        clearInterval(this.timer);
      }
      const endTime = val.endTime;
      // 在这里触发定时器 能获取最新的endTime ，但在触发结束事件 timeOver 作判断防止死循环
      this.run(endTime);
    }
  },
  created() {
    this.isArd = this.isAndroid();
  },
  beforeDestroy() {
    if (this.timer) {
      clearInterval(this.timer);
    }
  },
  methods: {
    isAndroid() {
      const ua = navigator.userAgent.toLowerCase();
      if (ua.match(/android/i) == "android") {
        return true;
      } else {
        return false;
      }
    },
    padClock(n, i) {
      n = parseInt(n) > 9 ? n + "" : String(n).padStart(2, "0");
      i = parseInt(i) > 9 ? i + "" : String(i).padStart(2, "0");
      return n + i;
    },
    getClock(surplusTime) {
      // 858631309
      let hours = Math.floor(surplusTime / (1000 * 3600)),
        // 计算小时候的剩余 毫秒数
        leave1 = surplusTime % (1000 * 3600),
        // 分钟
        minutes = Math.floor(leave1 / (1000 * 60)),
        // 分钟后剩余的毫秒数
        leave2 = leave1 % (1000 * 60),
        // 秒
        seconds = Math.floor(leave2 / 1000);
      return [hours, minutes, seconds].reduce(this.padClock);
    },
    getClass(n, i2) {
      return (
        this.classList.find(function(class_, classIndex) {
          return i2 - classIndex === n || i2 + classIndex === n;
        }) || ""
      );
    },
    run(endTime = "0") {
      const self = this;
      let columns = ["col1", "col2", "col3", "col4", "col5", "col6"],
        fontSize = 0.4,
        lastTimeNums = "";
      this.timer = setInterval(() => {
        let surplusTime = new Date(endTime) - new Date(),
          timenums = this.getClock(surplusTime);
        if (surplusTime <= 0) {
          clearInterval(this.timer);
          // 倒计时结束后，通知父组件
          // console.log("endTime", endTime);
          if (endTime != "0" && self.lastEndtime != endTime) {
            this.$emit("timeOver", this.activityInfo.type);
          }
          self.lastEndtime = endTime;
          return false;
        }
        columns.forEach((ele, i) => {
          let n = parseInt(timenums[i]),
            cuRef = this.$refs[ele],
            len = cuRef.children.length,
            // 每个格子的高度
            offset = -n * fontSize;
          if (lastTimeNums[i] != n) {
            if (n == len - 2) {
              this[ele] = false;
              // 安卓手机bug
              this.$nextTick(() => {
                cuRef.style.transform = `translateY(${-(len - 1) *
                  fontSize}rem)`;
              });
              setTimeout(() => {
                this[ele] = true;
                // 安卓手机bug
                this.$nextTick(() => {
                  cuRef.style.transform = `translateY(${offset}rem)`;
                });
                // 大于浏览器的帧数
              }, 30);
            } else {
              cuRef.style.transform = `translateY(${offset}rem)`;
            }
          }
        });
        lastTimeNums = timenums;
        //
      }, 1000);
    }
  }
};
</script>
<style lang="less" scoped>
// @isArd: `navigator.userAgent.toLowerCase() .match(/ android/i) == "android" `;
.time {
  height: 0.4rem;
  overflow: hidden;
  .column {
    display: inline-block;
    vertical-align: top;
    font-size: 0.26rem;
    color: #fff;
    width: 0.24rem;
    text-align: center;
    margin-left: 0.05rem;
    // position: relative;
  }
  .colon {
    width: 0.16rem;
    display: inline-block;
    font-size: 0.26rem;
    line-height: 0.4rem;
  }
  .column:nth-of-type(1) {
    margin-left: 0;
  }
  .animation {
    transition: transform 300ms;
  }

  .num {
    -webkit-transition: opacity 500ms, text-shadow 100ms;
    transition: opacity 500ms, text-shadow 100ms;
    text-align: center;
    height: 0.4rem;
    line-height: 0.4rem;
    width: 100%;
    // opacity: 0.025;
    opacity: 1;
    box-sizing: border-box;
    padding-left: 0.02rem;
  }

  .android {
    padding-top: 0.02rem;
  }

  .num.visible {
    opacity: 1;
    text-shadow: 1px 1px 0px #336699;
  }

  .num.close {
    opacity: 0.35;
  }

  .num.far {
    opacity: 0.15;
  }

  .num.distant {
    opacity: 0.1;
  }
}
</style>
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