创建一个名为 Autocomplete.vue 的文件，在这个组件中，使用了 Vue 3 的 Composition API，包括 ref、watch、onMounted 等。组件接收 placeholder、debounce 和 clearable 作为 props，并根据这些 props 来渲染输入框和下拉菜单
<template><div class="autocomplete"><inputv-model="query":placeholder="placeholder"@input="handleInput"@focus="handleFocus"@blur="handleBlur"@keydown.delete="handleClear"/><div v-if="showDropdown" class="dropdown"><divv-for="(item, index) in filteredItems":key="index"@click="handleSelect(item)">{{ item }}</div></div></div>
</template><script lang="ts">
import { defineComponent, ref, watch, onMounted } from 'vue';
import axios from 'axios';interface Props {placeholder?: string;debounce?: number;clearable?: boolean;
}export default defineComponent({props: {placeholder: {type: String,default: '请输入内容'},debounce: {type: Number,default: 300},clearable: {type: Boolean,default: true}},setup(props: Props) {const query = ref('');const showDropdown = ref(false);const items = ref<string[]>([]);const filteredItems = ref<string[]>([]);const timer = ref<number | null>(null);const handleInput = () => {if (timer.value) {clearTimeout(timer.value);}timer.value = setTimeout(fetchData, props.debounce);};const handleFocus = () => {showDropdown.value = true;};const handleBlur = () => {setTimeout(() => {showDropdown.value = false;}, 200);};const handleClear = () => {if (props.clearable) {query.value = '';showDropdown.value = false;}};const handleSelect = (item: string) => {query.value = item;showDropdown.value = false;};const fetchData = async () => {if (query.value.length > 0) {try {const response = await axios.get(`/api/search?query=${query.value}`);items.value = response.data.items;filteredItems.value = items.value.filter(item =>item.toLowerCase().includes(query.value.toLowerCase()));showDropdown.value = true;} catch (error) {console.error(error);}} else {showDropdown.value = false;}};onMounted(fetchData);watch(query, fetchData);return {query,showDropdown,filteredItems,handleInput,handleFocus,handleBlur,handleClear,handleSelect};}
});
</script><style scoped>
.autocomplete {position: relative;width: 300px;
}input {width: 100%;padding: 8px;box-sizing: border-box;
}.dropdown {position: absolute;width: 100%;border: 1px solid #ccc;background-color: #fff;z-index: 100;max-height: 200px;overflow-y: auto;
}.dropdown div {padding: 8px;cursor: pointer;
}.dropdown div:hover {background-color: #f0f0f0;
}
</style>
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