vue3 函数调用自定义loading组件

效果图

使用

import loading from "@/utils/index";
loading.show();
//模拟异步
setTimeout(() => {
loading.hide();
}, 3000);

代码

loading组件

<template>
  <div v-show="props.show" class="loading-container">
    <div class="loading-wrapper">
      <div class="my-loading">
        <div class="loading">
          <span>加</span>
          <span>载</span>
          <span>中</span>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup lang="ts">
const props = defineProps({
  show: {
    type: Boolean,
    default: true,
  },
});
</script>

<style lang="scss" scoped>
.loading-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(42, 122, 197, 0.7);
}
.loading-wrapper {
  height: 350rpx;
  width: 350rpx;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.my-loading {
  height: 350rpx;
  width: 350rpx;
  background: url("../../static/loading.gif");
  border-radius: 50%;
  background-size: 100% 100%;
  background-repeat: no-repeat;
}
.loading-text {
  text-align: center;
  color: white;
  line-height: 350rpx;
}
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  width: 100%;
}

.loading span {
  display: inline-block;
  width: 16px;
  height: 16px;
  margin: 0 10px;
  border-radius: 50%;
  color: black;
  animation: loading 1.5s ease-in-out infinite;
}

.loading span:nth-child(1) {
  /* background-color: #000; */
  animation-delay: 0.1s;
  color: white;
}

.loading span:nth-child(2) {
  /* background-color: #111; */
  animation-delay: 0.2s;
  color: white;
}

.loading span:nth-child(3) {
  /* background-color: #222; */
  animation-delay: 0.3s;
  color: white;
}

@keyframes loading {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.5);
  }
  100% {
    transform: scale(1);
  }
}
</style>

loading效果图

调用函数

import { createApp, ref, h } from "vue";
import Loading from "@/components/loading/index.vue";

let loadingInstance: any = null;

function initInstance() {
  //生成挂载dom
  const container = document.createElement("div");
  container.id = "loading-box";
  document.body.appendChild(container);

  const app = createApp({
    setup() {
      const loadingRef = ref({
        show: true,
        text: "",
      });

      return {
        loadingRef,
      };
    },

    render() {
      return h(Loading, {
        show: this.loadingRef.show,
      });
    },
  });

  loadingInstance = app.mount("#loading-box");
}

function show() {
  if (!loadingInstance) {
    initInstance();
  }
  loadingInstance.loadingRef.show = true;
}

function hide() {
  if (loadingInstance) {
    loadingInstance.loadingRef.show = false;
  }
}

export default {
  show,
  hide,
};

• initInstance:初始化loading实例。用ref保持响应式，render和h渲染组件，h函数的第二个参数将props传递给组件。
• show,hide:切换loading的显示和隐藏