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---
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order: 7
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title: 限制用户上传的文件
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---
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可以通过 `beforeUpload` 在文件上传之前进行干预，如限制用户只能上传 JPG 文件。
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也支持异步检查，`beforeUpload` 的返回值可以是一个 Promise：[示例](http://react-component.github.io/upload/examples/beforeUpload.html)。
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````jsx
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import { Upload, Button, Icon, message } from 'antd';
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const props = {
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action: '/upload.do',
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beforeUpload(file) {
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const isJPG = file.type === 'image/jpeg';
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if (!isJPG) {
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message.error('只能上传 JPG 文件哦！');
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}
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return isJPG;
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},
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};
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ReactDOM.render(
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<Upload {...props}>
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<Button type="ghost">
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<Icon type="upload" /> 点击上传
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</Button>
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</Upload>
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, mountNode);
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````
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