1999年 上网Wi-Fi technology was indeed available by 1999, but it was not widely accessible or as commonly used as it is today. The IEEE 802.11b standard, which provided speeds up to 11 Mbps, was approved in 1999, marking the beginning of mainstream Wi-Fi. However, the technology was mostly used in select offices, universities, and commercial spaces, as home Wi-Fi networks were still rare and costly 如何上网啊