fetch 流式请求_fetch请求流式接口识别到done报错

async function getStream() {
  try {
    let response = await fetch('/chat/stream/你好？'); //  /chat/stream/后面跟问题
    if (!response.ok) {
      throw new Error('Network response was not ok');
    }
    const reader = response.body.getReader();
    const textDecoder = new TextDecoder();
    let isEnd = false;
    params.text = ''
    while (!isEnd) {
      const { done, value } = await reader.read();
      if (done) {
        isEnd = true
        break;
      }
      const chunkText = textDecoder.decode(value);
      console.log(chunkText,'qing')
      params.text += chunkText;
    }
  } catch (e) {
    console.log(e);
  }
}