发送：
ChatInput.jsx

const file = event.target.files[0];
const { roomClient } = this.props;
const reader = new FileReader();
reader.onload = (e) => {
    // 先发送文件信息
    // 也可使用 bot 发送，@bot (.*)
    if (this.start === 0)
        roomClient.sendChatMessage(`hx1:{"name":"${file.name}","size":"${file.size}","type":"${file.type}"}`);

    this.start += e.loaded;

    // 发送分割的 ArrayBuffer
    roomClient.sendDataMessage(reader.result);
    console.log('发送文件', reader.result.byteLength);

    if (this.start < this.total) {
        const blob = file.slice(this.start, this.start + this.step);
        setTimeout(() => {
            reader.readAsArrayBuffer(blob);
        }, 50);
    } else {
        console.log('发送文件完成');

    }
}

// 初始化分割数据（Sctp消息有最大限制，详见server端config.js中的maxSctpMessageSize)
this.total = file.size;
this.start = 0;
this.step = 100000; // 这里使用100000配合Timeout 50 传输最为稳定

const blob = file.slice(this.start, this.start + this.step);
setTimeout(() => {
    reader.readAsArrayBuffer(blob);
}, 50);

接收：
RoomClient.js

dataConsumer.on('message', (message) => {
    if (message instanceof ArrayBuffer || message instanceof Blob) { // Failed to execute 'send' on 'RTCDataChannel': Blob support not implemented yet
                                    
        const length = message.byteLength;
        console.log('接收文件：', length);
        this.recvsize += length;
        if (!this.slice) this.slice = length;

        this.blobs.push(new Blob([message]));

        if (length < this.slice || length === this.filesize) {
            console.log('接收文件完成', this.recvsize);
            var file1 = new File(this.blobs, this.filename, {
                type: this.filetype
            });
            window.open(URL.createObjectURL(file1));
        }

        return;
    }

    switch (dataConsumer.label) {
        case 'chat': {
            if (message.startsWith('hx1:')) {
                const filejson = JSON.parse(message.substring(4));
                console.log('接收文件：', filejson);
                // 初始化接收数据
                this.filename = filejson.name;
                this.filesize = parseInt(filejson.size);
                this.recvsize = 0;
                this.slice = 0;
                this.blobs = [];
                this.filetype = filejson.type;
            } else {
                // show normal text message
            }
            // ....
});