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64b905e9bd
* update icons deps * update all icon ref * fix lint * update snapshot
54 lines
1.2 KiB
Markdown
54 lines
1.2 KiB
Markdown
---
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order: 10
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title:
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zh-CN: 上传前转换文件
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en-US: Transform file before request
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---
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## zh-CN
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使用 `transformFile` 转换上传的文件(例如添加水印)。
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## en-US
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Use `transformFile` for transform file before request such as add a watermark.
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```jsx
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import { Upload, Button } from 'antd';
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import { UploadOutlined } from '@ant-design/icons';
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const props = {
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action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
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transformFile(file) {
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return new Promise(resolve => {
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const reader = new FileReader();
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reader.readAsDataURL(file);
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reader.onload = () => {
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const canvas = document.createElement('canvas');
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const img = document.createElement('img');
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img.src = reader.result;
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img.onload = () => {
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const ctx = canvas.getContext('2d');
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ctx.drawImage(img, 0, 0);
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ctx.fillStyle = 'red';
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ctx.textBaseline = 'middle';
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ctx.fillText('Ant Design', 20, 20);
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canvas.toBlob(resolve);
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};
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};
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});
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},
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};
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ReactDOM.render(
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<div>
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<Upload {...props}>
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<Button>
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<UploadOutlined /> Upload
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</Button>
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</Upload>
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</div>,
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mountNode,
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);
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```
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