Upload上传

Upload上传

文件选择上传和拖拽上传控件。

何时使用

上传是将信息（网页、文字、图片、视频等）通过网页或者上传工具发布到远程服务器上的过程。

当需要上传一个或一些文件时。
当需要展现上传的进度时。
当需要使用拖拽交互时。

代码演示

经典款式，用户点击按钮弹出文件选择框。

import { Upload, message, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
const props = {
  name: 'file',
  action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
  headers: {
    authorization: 'authorization-text',
  },
  onChange(info) {
    if (info.file.status !== 'uploading') {
      console.log(info.file, info.fileList);
    }
    if (info.file.status === 'done') {
      message.success(`${info.file.name} file uploaded successfully`);
    } else if (info.file.status === 'error') {
      message.error(`${info.file.name} file upload failed.`);
    }
  },
};
ReactDOM.render(
  <Upload {...props}>
    <Button>
      <UploadOutlined /> Click to Upload
    </Button>
  </Upload>,
  mountNode,
);

已上传的文件列表

使用 defaultFileList 设置已上传的内容。

import { Upload, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
const props = {
  action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
  onChange({ file, fileList }) {
    if (file.status !== 'uploading') {
      console.log(file, fileList);
    }
  },
  defaultFileList: [
    {
      uid: '1',
      name: 'xxx.png',
      status: 'done',
      response: 'Server Error 500', // custom error message to show
      url: 'http://www.baidu.com/xxx.png',
    },
    {
      uid: '2',
      name: 'yyy.png',
      status: 'done',
      url: 'http://www.baidu.com/yyy.png',
    },
    {
      uid: '3',
      name: 'zzz.png',
      status: 'error',
      response: 'Server Error 500', // custom error message to show
      url: 'http://www.baidu.com/zzz.png',
    },
  ],
};
ReactDOM.render(
  <Upload {...props}>
    <Button>
      <UploadOutlined /> Upload
    </Button>
  </Upload>,
  mountNode,
);

完全控制的上传列表

使用 fileList 对列表进行完全控制，可以实现各种自定义功能，以下演示二种情况：

上传列表数量的限制。
读取远程路径并显示链接。

import { Upload, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
class MyUpload extends React.Component {
  state = {
    fileList: [
      {
        uid: '-1',
        name: 'xxx.png',
        status: 'done',
        url: 'http://www.baidu.com/xxx.png',
      },
    ],
  };
  handleChange = info => {
    let fileList = [...info.fileList];
    // 1. Limit the number of uploaded files
    // Only to show two recent uploaded files, and old ones will be replaced by the new
    fileList = fileList.slice(-2);
    // 2. Read from response and show file link
    fileList = fileList.map(file => {
      if (file.response) {
        // Component will show file.url as link
        file.url = file.response.url;
      }
      return file;
    });
    this.setState({ fileList });
  };
  render() {
    const props = {
      action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
      onChange: this.handleChange,
      multiple: true,
    };
    return (
      <Upload {...props} fileList={this.state.fileList}>
        <Button>
          <UploadOutlined /> Upload
        </Button>
      </Upload>
    );
  }
}
ReactDOM.render(<MyUpload />, mountNode);

文件夹上传

支持上传一个文件夹里的所有文件。

import { Upload, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
ReactDOM.render(
  <Upload action="https://www.mocky.io/v2/5cc8019d300000980a055e76" directory>
    <Button>
      <UploadOutlined /> Upload Directory
    </Button>
  </Upload>,
  mountNode,
);

图片列表样式

上传文件为图片，可展示本地缩略图。IE8/9 不支持浏览器本地缩略图展示（Ref），可以写 thumbUrl 属性来代替。

import { Upload, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
const fileList = [
  {
    uid: '-1',
    name: 'xxx.png',
    status: 'done',
    url: 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png',
    thumbUrl: 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png',
  },
  {
    uid: '-2',
    name: 'yyy.png',
    status: 'error',
  },
];
const props = {
  action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
  listType: 'picture',
  defaultFileList: [...fileList],
};
const props2 = {
  action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
  listType: 'picture',
  defaultFileList: [...fileList],
  className: 'upload-list-inline',
};
ReactDOM.render(
  <div>
    <Upload {...props}>
      <Button>
        <UploadOutlined /> Upload
      </Button>
    </Upload>
    <br />
    <br />
    <Upload {...props2}>
      <Button>
        <UploadOutlined /> Upload
      </Button>
    </Upload>
  </div>,
  mountNode,
);

/* tile uploaded pictures */
.upload-list-inline .ant-upload-list-item {
  float: left;
  width: 200px;
  margin-right: 8px;
}
.upload-list-inline [class*='-upload-list-rtl'] .ant-upload-list-item {
  float: right;
}
.upload-list-inline .ant-upload-animate-enter {
  animation-name: uploadAnimateInlineIn;
}
.upload-list-inline .ant-upload-animate-leave {
  animation-name: uploadAnimateInlineOut;
}

上传前转换文件

使用 transformFile 转换上传的文件（例如添加水印）。

import { Upload, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
const props = {
  action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
  transformFile(file) {
    return new Promise(resolve => {
      const reader = new FileReader();
      reader.readAsDataURL(file);
      reader.onload = () => {
        const canvas = document.createElement('canvas');
        const img = document.createElement('img');
        img.src = reader.result;
        img.onload = () => {
          const ctx = canvas.getContext('2d');
          ctx.drawImage(img, 0, 0);
          ctx.fillStyle = 'red';
          ctx.textBaseline = 'middle';
          ctx.fillText('Ant Design', 20, 20);
          canvas.toBlob(resolve);
        };
      };
    });
  },
};
ReactDOM.render(
  <div>
    <Upload {...props}>
      <Button>
        <UploadOutlined /> Upload
      </Button>
    </Upload>
  </div>,
  mountNode,
);

自定义交互图标

使用 showUploadList 设置列表交互图标。

import { Upload, Button } from 'antd';
import { UploadOutlined, StarOutlined } from '@ant-design/icons';
const props = {
  action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
  onChange({ file, fileList }) {
    if (file.status !== 'uploading') {
      console.log(file, fileList);
    }
  },
  defaultFileList: [
    {
      uid: '1',
      name: 'xxx.png',
      status: 'done',
      response: 'Server Error 500', // custom error message to show
      url: 'http://www.baidu.com/xxx.png',
    },
    {
      uid: '2',
      name: 'yyy.png',
      status: 'done',
      url: 'http://www.baidu.com/yyy.png',
    },
    {
      uid: '3',
      name: 'zzz.png',
      status: 'error',
      response: 'Server Error 500', // custom error message to show
      url: 'http://www.baidu.com/zzz.png',
    },
  ],
  showUploadList: {
    showDownloadIcon: true,
    downloadIcon: 'download ',
    showRemoveIcon: true,
    removeIcon: <StarOutlined onClick={e => console.log(e, 'custom removeIcon event')} />,
  },
};
ReactDOM.render(
  <Upload {...props}>
    <Button>
      <UploadOutlined /> Upload
    </Button>
  </Upload>,
  mountNode,
);

自定义进度条样式

使用 progress 属性自定义进度条样式。

import { Upload, message, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
const props = {
  name: 'file',
  action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
  headers: {
    authorization: 'authorization-text',
  },
  onChange(info) {
    if (info.file.status !== 'uploading') {
      console.log(info.file, info.fileList);
    }
    if (info.file.status === 'done') {
      message.success(`${info.file.name} file uploaded successfully`);
    } else if (info.file.status === 'error') {
      message.error(`${info.file.name} file upload failed.`);
    }
  },
  progress: {
    strokeColor: {
      '0%': '#108ee9',
      '100%': '#87d068',
    },
    strokeWidth: 3,
    format: percent => `${parseFloat(percent.toFixed(2))}%`,
  },
};
ReactDOM.render(
  <Upload {...props}>
    <Button>
      <UploadOutlined /> Click to Upload
    </Button>
  </Upload>,
  mountNode,
);

用户头像

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。

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。

import { Upload, message } from 'antd';
import { LoadingOutlined, PlusOutlined } from '@ant-design/icons';
function getBase64(img, callback) {
  const reader = new FileReader();
  reader.addEventListener('load', () => callback(reader.result));
  reader.readAsDataURL(img);
}
function beforeUpload(file) {
  const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png';
  if (!isJpgOrPng) {
    message.error('You can only upload JPG/PNG file!');
  }
  const isLt2M = file.size / 1024 / 1024 < 2;
  if (!isLt2M) {
    message.error('Image must smaller than 2MB!');
  }
  return isJpgOrPng && isLt2M;
}
class Avatar extends React.Component {
  state = {
    loading: false,
  };
  handleChange = info => {
    if (info.file.status === 'uploading') {
      this.setState({ loading: true });
      return;
    }
    if (info.file.status === 'done') {
      // Get this url from response in real world.
      getBase64(info.file.originFileObj, imageUrl =>
        this.setState({
          imageUrl,
          loading: false,
        }),
      );
    }
  };
  render() {
    const uploadButton = (
      <div>
        {this.state.loading ? <LoadingOutlined /> : <PlusOutlined />}
        <div className="ant-upload-text">Upload</div>
      </div>
    );
    const { imageUrl } = this.state;
    return (
      <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>
    );
  }
}
ReactDOM.render(<Avatar />, mountNode);

.avatar-uploader > .ant-upload {
  width: 128px;
  height: 128px;
}

照片墙

用户可以上传图片并在列表中显示缩略图。当上传照片数到达限制后，上传按钮消失。

import { Upload, Modal } from 'antd';
import { PlusOutlined } from '@ant-design/icons';
function getBase64(file) {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => resolve(reader.result);
    reader.onerror = error => reject(error);
  });
}
class PicturesWall extends React.Component {
  state = {
    previewVisible: false,
    previewImage: '',
    previewTitle: '',
    fileList: [
      {
        uid: '-1',
        name: 'image.png',
        status: 'done',
        url: 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png',
      },
      {
        uid: '-2',
        name: 'image.png',
        status: 'done',
        url: 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png',
      },
      {
        uid: '-3',
        name: 'image.png',
        status: 'done',
        url: 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png',
      },
      {
        uid: '-4',
        name: 'image.png',
        status: 'done',
        url: 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png',
      },
      {
        uid: '-5',
        name: 'image.png',
        status: 'error',
      },
    ],
  };
  handleCancel = () => this.setState({ previewVisible: false });
  handlePreview = async file => {
    if (!file.url && !file.preview) {
      file.preview = await getBase64(file.originFileObj);
    }
    this.setState({
      previewImage: file.url || file.preview,
      previewVisible: true,
      previewTitle: file.name || file.url.substring(file.url.lastIndexOf('/') + 1),
    });
  };
  handleChange = ({ fileList }) => this.setState({ fileList });
  render() {
    const { previewVisible, previewImage, fileList, previewTitle } = this.state;
    const uploadButton = (
      <div>
        <PlusOutlined />
        <div className="ant-upload-text">Upload</div>
      </div>
    );
    return (
      <div className="clearfix">
        <Upload
          action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
          listType="picture-card"
          fileList={fileList}
          onPreview={this.handlePreview}
          onChange={this.handleChange}
        >
          {fileList.length >= 8 ? null : uploadButton}
        </Upload>
        <Modal
          visible={previewVisible}
          title={previewTitle}
          footer={null}
          onCancel={this.handleCancel}
        >
          <img alt="example" style={{ width: '100%' }} src={previewImage} />
        </Modal>
      </div>
    );
  }
}
ReactDOM.render(<PicturesWall />, mountNode);

/* you can make up upload button and sample style by using stylesheets */
.ant-upload-select-picture-card i {
  color: #999;
  font-size: 32px;
}
.ant-upload-select-picture-card .ant-upload-text {
  margin-top: 8px;
  color: #666;
}

拖拽上传

把文件拖入指定区域，完成上传，同样支持点击上传。

设置 multiple 后，在 IE10+ 可以一次上传多个文件。

import { Upload, message } from 'antd';
import { InboxOutlined } from '@ant-design/icons';
const { Dragger } = Upload;
const props = {
  name: 'file',
  multiple: true,
  action: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
  onChange(info) {
    const { status } = info.file;
    if (status !== 'uploading') {
      console.log(info.file, info.fileList);
    }
    if (status === 'done') {
      message.success(`${info.file.name} file uploaded successfully.`);
    } else if (status === 'error') {
      message.error(`${info.file.name} file upload failed.`);
    }
  },
};
ReactDOM.render(
  <Dragger {...props}>
    <p className="ant-upload-drag-icon">
      <InboxOutlined />
    </p>
    <p className="ant-upload-text">Click or drag file to this area to upload</p>
    <p className="ant-upload-hint">
      Support for a single or bulk upload. Strictly prohibit from uploading company data or other
      band files
    </p>
  </Dragger>,
  mountNode,
);

手动上传

beforeUpload 返回 false 后，手动上传文件。

import { Upload, Button, message } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
import reqwest from 'reqwest';
class Demo extends React.Component {
  state = {
    fileList: [],
    uploading: false,
  };
  handleUpload = () => {
    const { fileList } = this.state;
    const formData = new FormData();
    fileList.forEach(file => {
      formData.append('files[]', file);
    });
    this.setState({
      uploading: true,
    });
    // You can use any AJAX library you like
    reqwest({
      url: 'https://www.mocky.io/v2/5cc8019d300000980a055e76',
      method: 'post',
      processData: false,
      data: formData,
      success: () => {
        this.setState({
          fileList: [],
          uploading: false,
        });
        message.success('upload successfully.');
      },
      error: () => {
        this.setState({
          uploading: false,
        });
        message.error('upload failed.');
      },
    });
  };
  render() {
    const { uploading, fileList } = this.state;
    const props = {
      onRemove: file => {
        this.setState(state => {
          const index = state.fileList.indexOf(file);
          const newFileList = state.fileList.slice();
          newFileList.splice(index, 1);
          return {
            fileList: newFileList,
          };
        });
      },
      beforeUpload: file => {
        this.setState(state => ({
          fileList: [...state.fileList, file],
        }));
        return false;
      },
      fileList,
    };
    return (
      <div>
        <Upload {...props}>
          <Button>
            <UploadOutlined /> Select File
          </Button>
        </Upload>
        <Button
          type="primary"
          onClick={this.handleUpload}
          disabled={fileList.length === 0}
          loading={uploading}
          style={{ marginTop: 16 }}
        >
          {uploading ? 'Uploading' : 'Start Upload'}
        </Button>
      </div>
    );
  }
}
ReactDOM.render(<Demo />, mountNode);

自定义预览

自定义本地预览，用于处理非图片格式文件（例如视频文件）。

import { Upload, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
const props = {
  action: '//jsonplaceholder.typicode.com/posts/',
  listType: 'picture',
  previewFile(file) {
    console.log('Your upload file:', file);
    // Your process logic. Here we just mock to the same file
    return fetch('https://next.json-generator.com/api/json/get/4ytyBoLK8', {
      method: 'POST',
      body: file,
    })
      .then(res => res.json())
      .then(({ thumbnail }) => thumbnail);
  },
};
ReactDOM.render(
  <div>
    <Upload {...props}>
      <Button>
        <UploadOutlined /> Upload
      </Button>
    </Upload>
  </div>,
  mountNode,
);

阿里云 OSS

使用阿里云 OSS 上传示例.

import { Form, Upload, message, Button } from 'antd';
import { UploadOutlined } from '@ant-design/icons';
class AliyunOSSUpload extends React.Component {
  state = {
    OSSData: {},
  };
  async componentDidMount() {
    await this.init();
  }
  init = async () => {
    try {
      const OSSData = await this.mockGetOSSData();
      this.setState({
        OSSData,
      });
    } catch (error) {
      message.error(error);
    }
  };
  // Mock get OSS api
  // https://help.aliyun.com/document_detail/31988.html
  mockGetOSSData = () => {
    return {
      dir: 'user-dir/',
      expire: '1577811661',
      host: '//www.mocky.io/v2/5cc8019d300000980a055e76',
      accessId: 'c2hhb2RhaG9uZw==',
      policy: 'eGl4aWhhaGFrdWt1ZGFkYQ==',
      signature: 'ZGFob25nc2hhbw==',
    };
  };
  onChange = ({ fileList }) => {
    const { onChange } = this.props;
    console.log('Aliyun OSS:', fileList);
    if (onChange) {
      onChange([...fileList]);
    }
  };
  onRemove = file => {
    const { value, onChange } = this.props;
    const files = value.filter(v => v.url !== file.url);
    if (onChange) {
      onChange(files);
    }
  };
  transformFile = file => {
    const { OSSData } = this.state;
    const suffix = file.name.slice(file.name.lastIndexOf('.'));
    const filename = Date.now() + suffix;
    file.url = OSSData.dir + filename;
    return file;
  };
  getExtraData = file => {
    const { OSSData } = this.state;
    return {
      key: file.url,
      OSSAccessKeyId: OSSData.accessId,
      policy: OSSData.policy,
      Signature: OSSData.signature,
    };
  };
  beforeUpload = async () => {
    const { OSSData } = this.state;
    const expire = OSSData.expire * 1000;
    if (expire < Date.now()) {
      await this.init();
    }
    return true;
  };
  render() {
    const { value } = this.props;
    const props = {
      name: 'file',
      fileList: value,
      action: this.state.OSSData.host,
      onChange: this.onChange,
      onRemove: this.onRemove,
      transformFile: this.transformFile,
      data: this.getExtraData,
      beforeUpload: this.beforeUpload,
    };
    return (
      <Upload {...props}>
        <Button>
          <UploadOutlined /> Click to Upload
        </Button>
      </Upload>
    );
  }
}
const FormPage = () => (
  <Form labelCol={{ span: 4 }}>
    <Form.Item label="Photos" name="photos">
      <AliyunOSSUpload />
    </Form.Item>
  </Form>
);
ReactDOM.render(<FormPage />, mountNode);

上传前裁切图片

配合 antd-img-crop 实现上传前裁切图片。

import React, { useState } from 'react';
import { Upload } from 'antd';
import ImgCrop from 'antd-img-crop';
const Demo = () => {
  const [fileList, setFileList] = useState([
    {
      uid: '-1',
      name: 'image.png',
      status: 'done',
      url: 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png',
    },
  ]);
  const onChange = ({ fileList: newFileList }) => {
    setFileList(newFileList);
  };
  const onPreview = async file => {
    let src = file.url;
    if (!src) {
      src = await new Promise(resolve => {
        const reader = new FileReader();
        reader.readAsDataURL(file.originFileObj);
        reader.onload = () => resolve(reader.result);
      });
    }
    const image = new Image();
    image.src = src;
    const imgWindow = window.open(src);
    imgWindow.document.write(image.outerHTML);
  };
  return (
    <ImgCrop rotate>
      <Upload
        action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
        listType="picture-card"
        fileList={fileList}
        onChange={onChange}
        onPreview={onPreview}
      >
        {fileList.length < 5 && '+ Upload'}
      </Upload>
    </ImgCrop>
  );
};
ReactDOM.render(<Demo />, mountNode);

API

参数	说明	类型	默认值	版本
accept	接受上传的文件类型, 详见 input accept Attribute	string	无
action	上传的地址	string\|(file) => `Promise`	无
method	上传请求的 http method	string	`post`
directory	支持上传文件夹（caniuse）	boolean	false
beforeUpload	上传文件之前的钩子，参数为上传的文件，若返回 `false` 则停止上传。支持返回一个 Promise 对象，Promise 对象 reject 时则停止上传，resolve 时开始上传（ resolve 传入 `File` 或 `Blob` 对象则上传 resolve 传入对象）。注意：IE9 不支持该方法。	(file, fileList) => `boolean \| Promise`	无
customRequest	通过覆盖默认的上传行为，可以自定义自己的上传实现	Function	无
data	上传所需额外参数或返回上传额外参数的方法	object\|(file) => `object \| Promise<object>`	无
defaultFileList	默认已经上传的文件列表	object[]	无
disabled	是否禁用	boolean	false
fileList	已经上传的文件列表（受控），使用此参数时，如果遇到 `onChange` 只调用一次的问题，请参考 #2423	object[]	无
headers	设置上传的请求头部，IE10 以上有效	object	无
listType	上传列表的内建样式，支持三种基本样式 `text`, `picture` 和 `picture-card`	string	`text`
multiple	是否支持多选文件，`ie10+` 支持。开启后按住 ctrl 可选择多个文件	boolean	false
name	发到后台的文件参数名	string	`file`
previewFile	自定义文件预览逻辑	(file: File \| Blob) => Promise<dataURL: string>	无
isImageUrl	自定义缩略图是否使用 `<img />` 标签进行显示	(file: UploadFile) => boolean	内部实现
showUploadList	是否展示文件列表, 可设为一个对象，用于单独设定 `showPreviewIcon`, `showRemoveIcon`, `showDownloadIcon`, `removeIcon` 和 `downloadIcon`	Boolean or { showPreviewIcon?: boolean, showRemoveIcon?: boolean, showDownloadIcon?: boolean, removeIcon?: React.ReactNode, downloadIcon?: React.ReactNode }	true
withCredentials	上传请求时是否携带 cookie	boolean	false
openFileDialogOnClick	点击打开文件对话框	boolean	true
onChange	上传文件改变时的状态，详见 onChange	Function	无
onPreview	点击文件链接或预览图标时的回调	Function(file)	无
onRemove	点击移除文件时的回调，返回值为 false 时不移除。支持返回一个 Promise 对象，Promise 对象 resolve(false) 或 reject 时不移除。	Function(file): `boolean \| Promise`	无
onDownload	点击下载文件时的回调，如果没有指定，则默认跳转到文件 url 对应的标签页。	Function(file): void	跳转新标签页
transformFile	在上传之前转换文件。支持返回一个 Promise 对象	Function(file): `string \| Blob \| File \| Promise<string \| Blob \| File>`	无
iconRender	自定义显示 icon	(file: UploadFile, listType?: UploadListType) => React.ReactNode	无
progress	自定义进度条样式	ProgressProps ( 仅支持 `type=”line”` )	`{ strokeWidth: 2, showInfo: false }`	4.3.0

onChange

上传中、完成、失败都会调用这个函数。

文件状态改变的回调，返回为：

{
  file: { /* ... */ },
  fileList: [ /* ... */ ],
  event: { /* ... */ },
}

file 当前操作的文件对象。

{
   uid: 'uid',      // 文件唯一标识，建议设置为负数，防止和内部产生的 id 冲突
   name: 'xx.png'   // 文件名
   status: 'done', // 状态有：uploading done error removed
   response: '{"status": "success"}', // 服务端响应内容
   linkProps: '{"download": "image"}', // 下载链接额外的 HTML 属性
}

fileList 当前的文件列表。
event 上传中的服务端响应内容，包含了上传进度等信息，高级浏览器支持。

FAQ

服务端如何实现？

服务端上传接口实现可以参考 jQuery-File-Upload。
如果要做本地 mock 可以参考这个 express 的例子。

如何显示下载链接？

请使用 fileList 属性设置数组项的 url 属性进行展示控制。

customRequest 怎么使用？

请参考 https://github.com/react-component/upload#customrequest。