UPDATE

src/App.vue

-<script setup>
-import HelloWorld from './components/HelloWorld.vue'
-import TheWelcome from './components/TheWelcome.vue'
-</script>
-
 <template>
-  <header>
-    <img alt="Vue logo" class="logo" src="./assets/logo.svg" width="125" height="125" />
-
-    <div class="wrapper">
-      <HelloWorld msg="You did it!" />
-    </div>
-  </header>
-
   <main>
-    <TheWelcome />
+    <button @click="configColor">生成唯一随机深色</button>
+    <div class="colorChunk" v-for="item in data" :key="item" :style="`background-color: ${item.color}`">{{ item.color }}</div>
   </main>
 </template>
-
-<style scoped>
-header {
-  line-height: 1.5;
-}
-
-.logo {
-  display: block;
-  margin: 0 auto 2rem;
-}
-
-@media (min-width: 1024px) {
-  header {
-    display: flex;
-    place-items: center;
-    padding-right: calc(var(--section-gap) / 2);
-  }
-
-  .logo {
-    margin: 0 2rem 0 0;
-  }
-
-  header .wrapper {
-    display: flex;
-    place-items: flex-start;
-    flex-wrap: wrap;
+<script>
+import { reactive, toRefs, nextTick } from "vue";
+export default {
+  name: "randomColor",
+  setup() {
+    const BasicState = reactive({
+      data:[
+        {name:'1'},
+        {name:'2'},
+        {name:'3'},
+        {name:'4'},
+        {name:'5'},
+        {name:'6'}
+      ],
+      exist_color:[],
+      randomColor(exist_color) {
+        let r = Math.floor(Math.random() * 192);
+        let g = Math.floor(Math.random() * 192);
+        let b = Math.floor(Math.random() * 192);
+        let r16 = r.toString(16).length === 1 && r.toString(16) <= "f" ? 0 + r.toString(16) : r.toString(16);
+        let g16 = g.toString(16).length === 1 && g.toString(16) <= "f" ? 0 + g.toString(16) : g.toString(16);
+        let b16 = b.toString(16).length === 1 && b.toString(16) <= "f" ? 0 + b.toString(16) : b.toString(16);
+        let color = '#' + r16 + g16 + b16;
+        if (exist_color.indexOf(color) === -1) {
+          return color;
+        } else {
+          BasicState.randomColor(exist_color);
+        }
+      },
+      configColor(){
+        BasicState.exist_color = [];
+        BasicState.data.forEach(ele=>{
+          let color = BasicState.randomColor(BasicState.exist_color);
+          ele = {
+            name:`第${ele.name}个`,
+            color:color
+          }
+        })
+      }
+    })
+    BasicState.configColor();
+    return {
+      ...toRefs(BasicState)
+    }
   }
 }
+</script>
+<style scoped>
+.colorChunk{
+  height: 200px;
+  width: 200px;
+  border: 1px solid red;
+}
 </style>