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---
order: 1
title:
zh-CN: 用户头像
en-US: Avatar
---
## zh-CN
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
Click to upload user's avatar, and validate size and format of picture with `beforeUpload` .
> 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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```jsx
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import { Upload, Icon, message } from 'antd';
function getBase64(img, callback) {
const reader = new FileReader();
reader.addEventListener('load', () => callback(reader.result));
reader.readAsDataURL(img);
}
function beforeUpload(file) {
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const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png';
if (!isJpgOrPng) {
message.error('You can only upload JPG/PNG file!');
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}
const isLt2M = file.size / 1024 / 1024 < 2 ;
if (!isLt2M) {
message.error('Image must smaller than 2MB!');
}
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return isJpgOrPng & & isLt2M;
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}
class Avatar extends React.Component {
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state = {
loading: false,
};
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handleChange = info => {
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if (info.file.status === 'uploading') {
this.setState({ loading: true });
return;
}
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if (info.file.status === 'done') {
// Get this url from response in real world.
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getBase64(info.file.originFileObj, imageUrl =>
this.setState({
imageUrl,
loading: false,
}),
);
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}
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};
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render() {
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const uploadButton = (
< div >
< Icon type = {this.state.loading ? ' loading ' : ' plus ' } / >
< div className = "ant-upload-text" > Upload< / div >
< / div >
);
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const { imageUrl } = this.state;
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return (
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< Upload
name="avatar"
listType="picture-card"
className="avatar-uploader"
showUploadList={false}
action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
beforeUpload={beforeUpload}
onChange={this.handleChange}
>
{imageUrl ? < img src = {imageUrl} alt = "avatar" style = {{ width: ' 100 % ' } } / > : uploadButton}
< / Upload >
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);
}
}
ReactDOM.render(< Avatar / > , mountNode);
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```
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```css
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.avatar-uploader > .ant-upload {
width: 128px;
height: 128px;
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}
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```