node版本比较低，所以没有用openAi的sdk模式，采用浏览器axios。

1、封装deepseek.js

import axios from 'axios'
class DeepSeekSDK {
  constructor () {
    // this.apiKey = 'sk-xxxx'
    this.apiKey = ''
    this.baseURL = '/deepseek'
    this.buffer = ''
    this.client = axios.create({
      baseURL: this.baseURL,
      headers: {
        'Authorization': `Bearer ${this.apiKey}`,
        'Content-Type': 'application/json'
      }
    })
  }
  async postData (data, filterData, source) {
    try {
      this.buffer = ''
      const response = await this.client.post('/chat/completions', data, {
        responseType: 'text', // 设置响应类型为流
        cancelToken: source.token,
        onDownloadProgress: (progressEvent) => {
          const chunk = progressEvent.currentTarget.responseText
          this.buffer += chunk
          let eventEndIndex
          while ((eventEndIndex = this.buffer.indexOf('\n\n')) >= 0) {
            const event = this.buffer.substring(0, eventEndIndex)
            this.buffer = this.buffer.substring(eventEndIn