request = wx.request({
    url: "https://xxx/stream",
    method: "POST",
    enableChunked: true,
    success: response => {
      console.log("success");
      //这里打印为什么没有data内容（非流据返回时，为啥拿不到data）
      {data: "", header: {…}, statusCode: 402, cookies: Array(0), errMsg: "request:ok"}
    }
}

request.onChunkReceived(function ({data}: any ) {
    console.log("onChunkReceived")
    // 这里收取流数据，ok
}