Vue加载序列帧动图

解读方法

1. 使用<img :src="currentFrame" alt="加载中" /> 加载图片
2. 动态更改src的值
3. 使用 requestAnimationFrame 定时更新
4. 在需要的页面调用封装的组件 <LoadToast v-if="showLoading" />

封装组件

<template>
  <div class="mask">
    <div class="mask-content-box">
      <div class="mask-content-show">
        <div ref="myLoad" class="mask-img">
          <img :src="currentFrame" alt="加载中" />
        </div>
        <div class="mask-word">账号绑定中，请稍等…</div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  mounted() {
    this.handleLoad(43)
  },
  destroyed() {
    if (this.animation !== null) {
      cancelAnimationFrame(this.animation)
    }
  },
  data() {
    return {
      animation: null,
      currentFrame: '',
    }
  },

  methods: {
    handleLoad(max, fps = 24) {
      let rootUrl = './icon_common_loading/icon_common_loading_000'
      let currentUrl = rootUrl + this.getNumber(0)
      this.currentFrame = require(`${currentUrl}`)
      let index = 0
      const frameInterval = 1000 / fps
      let lastTimestamp = 0

      const render = (timestamp) => {
        if (!lastTimestamp) lastTimestamp = timestamp
        const elapsed = timestamp - lastTimestamp
        if (elapsed >= frameInterval) {
          index > max ? (index = 0) : index
          let currentUrl = rootUrl + this.getNumber(index)
          this.currentFrame = require(`${currentUrl}`)
          index++
          lastTimestamp = timestamp
        }
        this.animation = requestAnimationFrame(render)
      }
      this.animation = requestAnimationFrame(render)
    },
    getNumber(num) {
      if (num < 10) {
        return '0' + num + '.png'
      } else {
        return num + '.png'
      }
    },
  },
}
</script>

<style lang="less" scoped>
.mask {
  background: transparent;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  &-content-box {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  &-content-show {
    width: 160px;
    height: 116px;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }
  &-img {
    width: 50px;
    height: 50px;
    img {
      width: 100%;
      height: 100%;
    }
    margin-bottom: 8px;
  }
  &-word {
    color: #fff;
    font-size: 13px;
    line-height: 18px;
  }
}
</style>