首先在菜单-运行-cmd 输入ping 127.0.0.1回车看通不通

Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128

Ping statistics for 127.0.0.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
这样就通
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Pinging 127.0.0.1 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 127.0.0.1:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
这样就不通

出现类似下面的画面就是通的
Reply from 127.0.0.1: bytes=32 time<1ms TTL=32
Reply from 127.0.0.1: bytes=32 time<1ms TTL=32
Reply from 127.0.0.1: bytes=32 time<1ms TTL=32
出现这个就是不通
Request timed out.
Request timed out.