chore: add alert plugin for docs; 🌟

docs/.vuepress/components/Alert.vue

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+<template>
+  <div class="alert" :style="`top: ${top}px`">
+    <slot></slot>
+  </div>
+</template>
+
+<script>
+  export default {
+    name: 'Alert',
+    props: ['show'],
+    data() {
+      return {
+        top: 100
+      }
+    },
+    mounted() {
+      console.log(this)
+      // this.$page.alert = this.$page.alert ? this.$page.alert : {top: 100}
+      // this.$page.alert.top += 20
+      // this.top = this.$page.alert.top
+      setTimeout(() => {
+        this.$el.remove()
+      }, 1000)
+    }
+  }
+</script>
+
+<style scoped>
+  .alert{
+    position: absolute;
+    padding: 6px 8px;
+    background-color: #f0f2f5;
+    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
+    border-radius: 4px;
+    margin: 0 auto;
+    z-index: 999;
+    top: 100px;
+    width: fit-content;
+    left: 0;
+    right: 0;
+  }
+</style>

docs/.vuepress/components/Color.vue

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+<template>
+  <div :data-clipboard-text="color" class="color" @click="onClick" :style="`background-color:${color}`" />
+</template>
+
+<script>
+  import Clipboard from 'clipboard'
+  export default {
+    name: 'Color',
+    props: ['color'],
+    data() {
+      return {
+        alert: false
+      }
+    },
+    methods: {
+      onClick() {
+        let clipboard = new Clipboard('.color')
+        clipboard.on('success', () => {
+          this.$alert(`颜色代码已复制：${this.color}`)
+          clipboard.destroy()
+        })
+      }
+    }
+  }
+</script>
+
+<style scoped>
+  .color{
+    border: 1px dashed #a0d911;
+    display: inline-block;
+    width: 20px;
+    height: 20px;
+    cursor: pointer;
+  }
+</style>

docs/.vuepress/components/ColorList.vue

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+<template>
+  <div>
+    <color class="color" :key="index" v-for="(color, index) in colors" :color="color" ></color>
+  </div>
+</template>
+
+<script>
+  export default {
+    name: 'ColorList',
+    props: ['colors']
+  }
+</script>
+
+<style scoped>
+  .color{
+    margin: 0 2px;
+  }
+</style>