Multimedia (Multiple-Media)
HTML5 standard native support for multimedia, is no longer necessary as the use of a variety of plug-confused as before to achieve (such as Flash, etc.)
Multimedia embedded in a Web page by <audio> and <video> element to achieve
iframe
Inline frames, pages or other resources embedded in the current page
Spread
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audio element is a new element h5, play music
controls the playback progress bar display
autoplay does not display playback progress bar
Whether loop automatic repeat, that single cycle
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video show video
Controls the width of the display
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Some music files can not just change the file extension to download format conversion of chemical plant
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Only interaction can go further
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windows command line to modify the user's password, regardless of whether there had been a password before, you can change
net user password
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When the role of a data transmission protocol layers: the application layer is responsible for the data is ready, format, etc. ready to call send, to the transport layer, if to TCP, TCP destination port number will be added in front of the data, followed by the original port number, to the IP network layer, IP at both sides and then adding the original target IP and IP transport and then sent to the physical layer, the physical layer to the router, the router will check the destination IP and port number, the routing table, it is found out transferred to the next route, it is not found by the default IP and port number of the other party is received ..... will unpack layers, reverse steps, verifies data to the transport layer, the check fails will sender to resend, the IP port number of the check succeeds, the data is removed at both ends, and then the data to the application layer depacketizer
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Firewall software generally between the network layer and the transport layer
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Create a TCP stream socket
UDP datagram socket is created
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To open a special window to run the program, even if disconnected, it will not terminate the program execution
screen -S filename
Kill a port
screen -ls View
screen -r program name
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Check the port number 9999
netstat -tlnp | grep 9999
PID program running on the View
ps -ef | gref 29374(PID)
11.URL coding, URL characters in non-ASCALL code can not appear