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Demo 1 is a static Node List, which is a snapshot of the Li Collection, and no action on the document will affect it.But why design it like this?In fact, the Queryselectorall method is clearly stipulated in the standard of the "6": the NodeList object returned by the Queryselectorall () method must is sta

the administrator with convenient and reasonable allocation of storage resources to the users, so as to avoid the system crash caused by the uncontrolled use of disk space, and improve the security of the system. 7. NTFS uses a "change" log to track changes that occur in a record file. On the security side of the system, the NTFS file system has features that are not available in many FAT32 file systems, and Win 2000 on NTFS runs faster than FAT32

to ENUM. 2. use join instead of subquery 3. use UNION instead of creating a temporary table manually 4. transaction processing (ensure data integrity. for example, if both are added and modified, both operations are performed, and both operations fail) 5. how to create an index? Advantages and disadvantages of indexes ?) 6. optimize SQL statements 7. the explain command shows the mysql execution plan.

software depend on?6) What software depends on you?7) Can you safely remove or upgrade it?8) Do you know what other partners have installed and changed?9) Do you know the software status of each machine?9) If you want to hand over your job to someone else, can you make it clear?10)

What is the difference between match_parent and fill_parent ?, Matchparent What is the difference between match_parent and fill_parent when I am working on andorid recently? Both match_parent and fill_parent are filled with paren

the pros and cons of indexing? ） 6, Optimizing SQL statements 7,explain can see the MySQL execution plan 8, sub-table (Vertical sub-table, horizontal sub-table?) ） Related reading Http://www.phpernote.com/mysql/500.html http://www.nowamagic.net/librarys/veda/detail/1899 The above describes the

This article mainly introduces Echo,print () and Print_r () what is the difference between interested friends to understand. What is the difference between 1.echo,print () and Print_r ()? Echo

What is the difference between the exec function and the shell_exec function in PHP? execshell_exec Both of these functions execute Linux Command functions. The difference is that the returned results are different. exec can only obtain the last row of data, while shell_exec

What is the difference between reading and writing files in binary and text formats? In c ++ project development, file read/write operations are often involved. Therefore, let's take a brief look at the differences between the text mode and the binary mode in reading and writing files. 1. read/write of text and binary files on linux When reading and writing files

Article Title: What is the difference between Linux and BSD ?. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Do you often hear people confuse Linux and BSD systems? Yes, I often h

How to develop mobile HTML5? What is the difference with PC end? How to develop mobile HTML5? What is the difference with PC end? Reply content: Thank you.This is a big problem. I will

What is the difference between int (10) and int (11) in Mysql? bitsCN.com What is the difference between int (10) and int (11) in Mysql? Mysql supports all standard SQL numeric data types. These types include strict NUMERIC data

Double poles for single mic connectors, or mono connectors Three-pole for two-channel connectors Four-pole for the connector with MIC function and two-channel output The 2.5mm PIN definition and function division is the same as 3.5mm, just a small diameter. One, 3.5mm/2.5mm headphone plug Comparison As the following figure shows, the difference between the two

standard as N750.What is the Ⅱ class ceramic, what is the characteristic?Ⅱ Ceramic capacitors (classⅱceramic capacitor) were formerly known as low-frequency ceramic capacitors (lower frequency ceramic capacitor), refers to the use of ferroelectric ceramics as a dielectric capacitor, so also known as ferroelectric cera

What is the difference between directly mounting a hard disk and attaching a partition in Linux?Zookeeper 1. Problem What is the difference between directly mounting a hard disk and attaching a partition in Linux?For example, the

function can not specify a compressed backup, relatively Oracle's active protection function is very common; 6, the function of the operation of DB2 I also very much love, Oracle also has similar ahm, but the operation of DB2 more direct, can see what the database is currently in doubt, DB2 give the idea of how to dispose of the staff procedures;

Because the company is in the same use. NET and Java, and each service set uses an interface for communication, so a more secure system, such as a clearing system or a cashier, uses RSA for encryption. So it will involve the conversion of the secret key. So I probably saw the secret key of C # and Java secret key difference. RSA is no different from the program

which is good for PHP and python? What is the difference between PHP and python? A lot of friends will come to ask such a question, then today's PHP Chinese network for everyone to say about the difference between PHP and Python,I believe you read this article should have so

, you set the volume to 50%, youThen you can get a 50% volume and use directsound to play the video. If you set the volume to 50%, you only get the most25% of the total volume. Solution: Do not use waveout and set the volume to the maximum value in the Windows volume control..Q is the quality of sound output between directsound and waveout different?A1 in win2kxp (or using a WDM driver), waveout and directsound are only transmitted in PThere are two d

from the host system to improve the performance; 4. Ensure the security of keys and key parameters in the encryption hardware; 5. Verify on the hardware; 6. high cost-effectiveness in large and medium-sized application environments, facilitating expansion; 7. encryption is bound to a specific device, so it is "always encrypted ";