从网络上获取时间，不是时间服务器，从网页获取的时间，网上很难找的这方面的，才自己动手写了这个，可以稍稍修改下，用来同步自己电脑时间(Access to time from the network, not the time server, access time from the web, the Internet is difficult to find in this area, and then wrote it yourself, can be slightly modified, us