<template>
  <div>
    <!-- :style="{ backgroundImage: `url(${data.backgroundImage})` }"  背景图片，可变量 -->
    <div class="home" :style="{ backgroundImage: `url(${data.backgroundImage})` }"></div>
    <button @click="changeImage">切换</button>
  </div>
</template>

<script setup>
import bg1 from "../assets/bg1.png";
import bg2 from "../assets/bg2.png";
import bg3 from "../assets/bg3.png";
import bg4 from "../assets/bg4.png";
import bg5 from "../assets/bg5.png";
import {reactive} from "vue";
const data = reactive({
  backgroundImage: bg1,
  // 把所有图片放到数组，用于获取下标来获取图片
  imgs: [bg1, bg2, bg3, bg4, bg5],
});
// 点击切换颜色
const changeImage = () => {
  // 随机一个整数，Math.random()*4是随机0到4的整数
  let name = Math.round(Math.random() * 4);
  // 把随机的图片重新放到backgroundImage
  data.backgroundImage = data.imgs[name];
};
</script>

<style lang="scss">
.home {
  width: 1000px;
  height: 500px;
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;
}
</style>