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<docs>
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---
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order: 1
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title:
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zh-CN: 用户头像
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en-US: Avatar
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---
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## zh-CN
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点击上传用户头像，并使用 `beforeUpload` 限制用户上传的图片格式和大小。
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> `beforeUpload` 的返回值可以是一个 Promise 以支持异步处理，如服务端校验等：[示例](http://react-component.github.io/upload/examples/beforeUpload.html)。
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## en-US
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Click to upload user's avatar, and validate size and format of picture with `beforeUpload`.
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> The return value of function `beforeUpload` can be a Promise to check asynchronously. [demo](http://react-component.github.io/upload/examples/beforeUpload.html)
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</docs>
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<template>
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<a-upload
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v-model:file-list="fileList"
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name="avatar"
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list-type="picture-card"
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class="avatar-uploader"
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:show-upload-list="false"
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action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
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:before-upload="beforeUpload"
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@change="handleChange"
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>
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<img v-if="imageUrl" :src="imageUrl" alt="avatar" />
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<div v-else>
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<loading-outlined v-if="loading"></loading-outlined>
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<plus-outlined v-else></plus-outlined>
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<div class="ant-upload-text">Upload</div>
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</div>
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</a-upload>
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</template>
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<script lang="ts">
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import { PlusOutlined, LoadingOutlined } from '@ant-design/icons-vue';
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import { message } from 'ant-design-vue';
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import { defineComponent, ref } from 'vue';
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interface FileItem {
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uid: string;
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name?: string;
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status?: string;
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response?: string;
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url?: string;
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type?: string;
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size: number;
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originFileObj: any;
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}
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interface FileInfo {
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file: FileItem;
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fileList: FileItem[];
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}
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function getBase64(img: Blob, callback: (base64Url: string) => void) {
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const reader = new FileReader();
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reader.addEventListener('load', () => callback(reader.result as string));
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reader.readAsDataURL(img);
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}
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export default defineComponent({
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components: {
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LoadingOutlined,
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PlusOutlined,
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},
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setup() {
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const fileList = ref([]);
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const loading = ref<boolean>(false);
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const imageUrl = ref<string>('');
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const handleChange = (info: FileInfo) => {
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if (info.file.status === 'uploading') {
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loading.value = true;
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return;
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}
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if (info.file.status === 'done') {
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// Get this url from response in real world.
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getBase64(info.file.originFileObj, (base64Url: string) => {
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imageUrl.value = base64Url;
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loading.value = false;
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});
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}
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if (info.file.status === 'error') {
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loading.value = false;
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message.error('upload error');
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}
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};
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const beforeUpload = (file: FileItem) => {
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const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png';
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if (!isJpgOrPng) {
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message.error('You can only upload JPG file!');
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}
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const isLt2M = file.size / 1024 / 1024 < 2;
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if (!isLt2M) {
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message.error('Image must smaller than 2MB!');
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}
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return isJpgOrPng && isLt2M;
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};
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return {
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fileList,
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loading,
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imageUrl,
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handleChange,
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beforeUpload,
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};
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},
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});
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</script>
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<style>
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.avatar-uploader > .ant-upload {
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width: 128px;
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height: 128px;
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}
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.ant-upload-select-picture-card i {
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font-size: 32px;
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color: #999;
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}
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.ant-upload-select-picture-card .ant-upload-text {
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margin-top: 8px;
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color: #666;
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}
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</style>
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