.block-loading {
  width: 100%;
  height: 100%;
  position: fixed;
  z-index: 9990;
  background-color: rgba($color: #fff, $alpha: 0.5);
}
.block-loading .block-loading-box {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.block-loading .block-loading-box-warp {
  width: 80px;
  height: 80px;
}
.block-loading .block-loading-box-warp .block-loading-box-item {
  width: 33.333333%;
  height: 33.333333%;
  background: #409eff;
  float: left;
  animation: block-loading-animation 1.2s infinite ease;
  border-radius: 1px;
}
.block-loading .block-loading-box-warp .block-loading-box-item:nth-child(7) {
  animation-delay: 0s;
}
.block-loading .block-loading-box-warp .block-loading-box-item:nth-child(4),
.block-loading .block-loading-box-warp .block-loading-box-item:nth-child(8) {
  animation-delay: 0.1s;
}
.block-loading .block-loading-box-warp .block-loading-box-item:nth-child(1),
.block-loading .block-loading-box-warp .block-loading-box-item:nth-child(5),
.block-loading .block-loading-box-warp .block-loading-box-item:nth-child(9) {
  animation-delay: 0.2s;
}
.block-loading .block-loading-box-warp .block-loading-box-item:nth-child(2),
.block-loading .block-loading-box-warp .block-loading-box-item:nth-child(6) {
  animation-delay: 0.3s;
}
.block-loading .block-loading-box-warp .block-loading-box-item:nth-child(3) {
  animation-delay: 0.4s;
}
@keyframes block-loading-animation {
  0%,
  70%,
  100% {
    transform: scale3D(1, 1, 1);
  }
  35% {
    transform: scale3D(0, 0, 1);
  }
}

import "@/style/loading.scss";

export const loading = {
  show: () => {
    const bodys: Element = document.body;
    const div = document.createElement("div");
    div.className = "block-loading";
    div.innerHTML = `
            <div class="block-loading-box">
                <div class="block-loading-box-warp">
                    <div class="block-loading-box-item"></div>
                    <div class="block-loading-box-item"></div>
                    <div class="block-loading-box-item"></div>
                    <div class="block-loading-box-item"></div>
                    <div class="block-loading-box-item"></div>
                    <div class="block-loading-box-item"></div>
                    <div class="block-loading-box-item"></div>
                    <div class="block-loading-box-item"></div>
                    <div class="block-loading-box-item"></div>
                </div>
            </div>
        `;
    bodys.insertBefore(div, bodys.childNodes[0]);
  },
  hide: () => {
    nextTick(() => {
      setTimeout(() => {
        const el = document.querySelector(".block-loading");
        el && el.parentNode?.removeChild(el);
      }, 1000);
    });
  }
};

<script lang="ts" setup>
import { loading } from "@/utils/loading";

loading.show();

const timer = setTimeout(() => {
  loading.hide();
}, 3000);

clearTimeout(timer);
</script>