新增加星空背景组件

src/views/components/starBackground.vue

@@ -0,0 +1,58 @@
+<template>
+  <div class="stars">
+    <div class="star" v-for="(item, index) in starsCount" :key="index" ref="star"></div>
+  </div>
+</template>
+
+<script setup name="starBackground">
+import { getCurrentInstance, onMounted } from 'vue'
+
+const starsCount = ref(600)
+const distance = ref(800)
+const { proxy } = getCurrentInstance()
+onMounted(() => {
+  initStars()
+})
+function initStars() {
+  let starArr = proxy.$refs.star
+  starArr.forEach((item) => {
+    let speed = 0.2 + Math.random() * 1
+    let thisDistance = distance.value + Math.random() * 300
+    item.style.transformOrigin = `0 0 ${thisDistance}px`
+    item.style.transform = `translate3d(0, 0, -${thisDistance}px) rotateY(${Math.random() * 360}deg) rotateX(${Math.random() * -50}deg) scale(${speed}, ${speed})`
+  })
+}
+</script>
+
+<style scoped lang="scss">
+@keyframes rotate {
+  0% {
+    transform: perspective(600px) rotateZ(20deg) rotateX(-40deg) rotateY(0);
+  }
+  100% {
+    transform: perspective(600px) rotateZ(20deg) rotateX(-40deg) rotateY(-360deg);
+  }
+}
+
+.stars {
+  transform: perspective(500px);
+  transform-style: preserve-3d;
+  // position: absolute;
+  perspective-origin: 50% 100%;
+  left: 50%;
+  animation: rotate 90s infinite linear;
+  bottom: -200px;
+  // 注意要用fixed，不然会超出屏幕
+  position: fixed;
+}
+
+.star {
+  width: 2px;
+  height: 2px;
+  background: #f7f7b8;
+  position: absolute;
+  top: 0;
+  left: 0;
+  backface-visibility: hidden;
+}
+</style>