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JavaScript array Basic operations An array in JavaScript is a special object that represents the index of an offset as an attribute of the object, which may be an integer, but these numeric indices are internally converted to string types because the property name in the JavaScript object must be a string. One: How do I create an array? There are 2 ways to create an array, the first of which is the literal number of objects as follows: var arrs = []; An empty array was defined. Another way

statement 2 will be executed, all the result sets are put together, finally get the temp result set. 4. Finally, we get the query result we expect from the temp temporary collection through statement 4.A special reminder is 1, be sure to pay attention to statement 3 of the association conditions, otherwise it is easy to write a dead loop. 2. Statement 2 must be UNION all finally, let's guess what the result will be if you remove the WHERE clause of statement 1. Removing where will be all dead l

1. Command functionRmDir: Delete Empty directory2. Command formatrmdir [Options] Directory3. Command parameters-P: Recursive delete-V: Show more information4. Command instancesExample 1: Cannot delete a non-empty directory[[email protected] ~]# lsAA ABC anaconda-ks.cfg Desktop file1 file2 gg install.log install.log.syslog[[email protected] ~]# rmdir AARmdir:aa:Directory not emptyExample 2: Recursive deletion of empty directories[Email protected] ~]# MKDIR-PV AA/

", the smallest bid wins! The process of choosing the minimum bid bridge is often accompanied by an exciting title named "Root Wars" As with the bridge ID discussed earlier, a bid is a 8-byte identifier consisting of a bridge priority and a MAC address, and from figure 6-6 you can see that Cat-a has a bid with a default value of 32768.AA-AA-AA-AA-AA-AA. Note that here the decimal and 16 binary are mixed, although this may seem odd, but this expression allows you to clearly see each part of th

recognizes the UTF8 code. All sending commands are UTF-8 encoded. Each Command ends with a line break. Run the following code to send commands. Private void WriteToNetStream (ref NetworkStream NetStream. string Command) {String stringToSend = Command + "\ r \ n "; Byte [] arrayToSend = System. Text. Encoding. UTF8.GetBytes (StringToSend. ToCharArray ()); NetStream. Write (arrayToSend, 0, arrayToSend. Length );} 3.2 accept the promise code The SMTP server sends a response to each of them. The fo

is marked in the diagram. The spoofing source sends an ARP message to the gateway at every interval of time, with the contents of my IP address 192.168.1.3 (spoofed host IP), and my MAC address is BB-BB-BB-BB-BB-BB (own MAC addre

divided into two types based on different receiving objects:1. Broadcast package (broadcast ). The MAC address of the broadcast packet is a FF-FF-FF-FF-FF-FF, which is forwarded to all hosts in the LAN after the switch device receives the broadcast packet.2. Non-broadcast package (non-broadcast ). Only the specified host can receive a non-broadcast packet. ARP packets can be divided into two types based on different functions:1. arp request packets ). The ARP request packet is used to obtain th

, CURLOPT_CUSTOMREQUEST, "POST"); curl_setopt ($ ch, CURLOPT_POSTFIELDS, $ sendJsonData); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, true ); curl_setopt ($ ch, CURLOPT_HTTPHEADER, array ('content-Type: application/json', 'Content-Length :'. strlen ($ sendJsonData); $ ret = curl_exec ($ ch); if ($ ret = '00') {code executed successfully ;} elseif ($ ret = '11') {logon failed} This was originally written in this way. login failed {"Aa": "00", "bb": "

@ Property defines attributes and declares the getter and setter methods. (Note: The property is not a variable) @ Synthesize is used to implement attributes, such as the getter and setter methods. If you override setter, Getter, and method when declaring an attribute, You need to define the unrecognized variable in @ synthesize and apply the attribute access method to the variable. For example: . H file @property (nonatomic,assign)NSInteger age;@property (nonatomic,retain)NSString * name;@prope

In Linux, back up partition tables: Use the DD command 1. Back up the MBR Master Boot Record without backing up the master Partition Table: # Dd If =/dev/SDA of = MBR. Backup BS = 446 COUNT = 1 2. View in hexadecimal format:# HD-v mbr. Backup00000000 EB 63 90 D0 BC 00 7C 8e C0 8e D8 be 00 7C BF 00 |. C ...... |00000010 06 B9 00 02 FC F3 A4 50 68 1C 06 cb fb B9 04 00 | ...... pH ...... |00000020 BD be 07 80 7E 00 00 7C 0b 0f 85 0e 01 83 C5 10 | ....~.. | ...... |00000030 E2 F1 CD 18 88 56 00 55

Resolution" is the process by which a host converts a target IP address to a target MAC address before sending a frame. The basic function of ARP protocol is to inquire the MAC address of target device through the IP address of target device, so as to ensure the smooth communication. Each computer installed with the TCP/IP protocol has an ARP cache table, and the IP address in the table and the MAC address is one by one corresponding, as shown in the tables below. Host IP Address MAC address

use the TcpClient class to develop an SMTP client to send mail.3.1 Sending SMTP commandsThe SMTP server generally recognizes the UTF8 code, and all Send commands use UTF8 encoding, and each command ends with a carriage return line break. The following code implements the command's send function.private void Writetonetstream (ref networkstream netstream.string Command){String stringtosend = Command + "\ r \ n";byte[] Arraytosend = System.Text.Encoding.UTF8.GetBytes(Stringtosend.tochararray ());N

{ public static short getunsignedbyte (Bytebuffer bb) {return (short) (Bb.get () 0xff)); } public static void Putunsignedbyte (Bytebuffer bb, intValue) {Bb.put ((byte) (value 0xff)); } public static short getunsignedbyte (Bytebuffer BB, int. position) {return (short) (Bb.get (position) (short) 0xff)); } public static void Putunsignedbyte (Bytebuffer

I thought that PHP and and are the same, just the wording for readability and aesthetics, in fact I was wrong. There's a hole deep inside!Look at the following code:$bA = true;$bB = false;$b 1 = $bA and $bB;$b 2 = $bA $bB;Var_dump ($b 1); $b 1 = TrueVar_dump ($b 2); $b 2 = False$bA = false;$bB = true;$b 3 = $bA or $

host converts a target IP address to a target MAC address before sending a frame. The basic function of ARP protocol is to inquire the MAC address of target device through the IP address of target device, so as to ensure the smooth communication. Each computer installed with the TCP/IP protocol has an ARP cache table, and the IP address in the table and the MAC address is one by one corresponding, as shown in the tables below. Host IP Address MAC address A 192.168.16.1 Aa-aa-aa-aa-aa-aa B 1

Tags: repeatableThe transaction isolation level is repeatable read in caseTransaction 2 does not execute a commit and cannot read the newly added record for transaction 1.Transaction 2 executes a commit and can read the newly added record to transaction 1.Session1 Execution Transaction 1: Insert and commit onlyMysql> SELECT @ @tx_isolation;+-----------------+| @ @tx_isolation |+-----------------+| Repeatable-read |+-----------------+1 row in Set (0.00 sec)Mysql>mysql> start transaction;Query OK,

Jquery selector is the most basic operation. When we use native javascript, we have to spend nine heads and two tigers to choose an object. With Jquery selector, the food is delicious, good health ...... 1. Basic We know that jquery is the most commonly used selector. Let's take a look at the selector in jqueryAPI-there are five situations: class, id, element, *, and a multi-selector, here we want to write the css style Css styles also have several situations: 1. Class styles 2. id styles 3. L

In the previous two blogs, we introduced byte and network byte. If you are interested, you can access several functions related to java_network_endianness-byte order and java_network_endian. This blog mainly talks about JavaVM and byte sequence. It is explained through an example. We know that the mechanism for storing data in memory varies with different CPUs or different operating systems with the same CPU! But how does the Java Virtual Machine store data? In other words, is the JVM large-end

the location of the last occurrence of the specified string in the target string)Substr_count (' ABCD ',' B ');//1 (counts the number of occurrences of a string)STRCSPN (' Aabb cc ',' C ');//5 (returns the number of characters to find in a string before any specified character is found)STRSPN (' abcdef ',' abc ');//3 (returns the number of specific characters contained in the string)STRSPN (' abcdef ',' BC ');//0STRSPN (' abcdef ',' BC ',1,5);//2Chr $);//a (get ASCII encoding)Ord' A ');//65STRC