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$ Var_dump($a===$e);//false $ - Var_dump($b===$c);//false - Var_dump($b===$d);//false the Var_dump($b===$e);//false - Wuyi Var_dump($c===$d);//false the Var_dump($c===$e);//falseSummary:For0； ' 0 ' ；"'；NULL；false"Five types of empty operations above five variables, all return false strong equals (===The comparison is false, with strong language results (three equals not only comparing values, but also comparing types) but for (==), you need to pay attention to the str

, call, apply, and so on._proto__ get arguments/set arguments and get caller/set caller as the name implies access to arguments and caller, first cannot directly set two properties (invalid setting), And then through Object.getownpropertydescriptor observed that both are non-writable and non-configurable, it means that you cannot manually use Object.defineproperty by modifying the value or setter to update the values of both, you can guess, JS trying to prevent artificial Update both properties

Xlog file corresponding to the log can also be inferred from Current_xlog_location:Timeline 0000000000000045----> 000000010000000000000045(iii) LSN when used for recovery1) Use Pg_controldata to obtain control information from the controls file:Appledemacbook-pro-2:pg_xlog apple$ Pg_controldataPg_control version number:942Catalog version number:201510051Database system identifier:6451705940496018968Database Cluster State:in ProductionPg_control Last Modified: 4/9 10:52:12 2018Latest Checkpoint

Three-tier network VLAN static routing, reverse routing settings précis-writers Hub Switch Settings Set VLAN 1 ~ n ...., Router layer VLAN 9 IP segment/Subnet mask/Gateway (interface) ---------------------------------------------------------------- 192.168.1.0/255.255.255.0/192.168.1.1 192.168.2.0/255.255.255.0/192.168.2.1 192.168.3.0/255.255.255.0/192.168.3.1 Router Layer VLAN 9 192.168.9.0/255.255.255.0/192.168.9.1 Hub Switch Global routing (point

slave; View status Mysql>show slave status\g;*************************** 1. Row***************************slave_io_state:waiting forMaster toSend event Master_host:10.168.21.180Master_user:bak Master_port:3306Connect_retry: -Master_log_file:mysql-Bin.000002Read_master_log_pos:991relay_log_file:gsm2-Relay-Bin.000002Relay_log_pos:761Relay_master_log_file:mysql-Bin.000002Slave_io_running:yes Slave_sql_running:yes Replicate_do_db:repli Cate_Ignore_DB:Replicate_Do_Table:Replicate_Ignore_Table:Replic

)" - "VALUES (4, ' Tom ', 13,99.4);" - "INSERT into STUDENT (num,name,age,sorce)" A "VALUES (5, ' Jack ', 13,89.1);"; + theresult = Sqlite3_exec (db,sql,callback,null,rerrmsg); - if(Result! =0) $ { theprintf"Insert Data err:%s\n", rerrmsg); the Sqlite3_free (rerrmsg); the return-3; the } - in Else the { theprintf"Insert Data succe

I want to improve my programming technology now. A programmer free developer of PHP Take the outsourcing project (or go to the outsourcing company), or go to the Internet companies to learn to constantly improve their programming skills Reply content: I want to improve my programming technology now. A programmer free developer of PHP Take the outsourcing project (or go to the outsourcing

I want to improve my programming technology. A developer who is a PHP programmer is free to pick up outsourcing projects (or go to outsourcing companies) on his own ), I still want to go to Internet companies to learn and constantly improve their programming technologies. Now I want to improve my programming technology, a developer who is free to be a PHP programmer. If you want to connect to an outsourc

technology does Google use? PageRank is the webpage level.Google has a founder named Larry Page. It is said that he applied for the PageRank patent, so he got Page Rank based on his name. There is also a very successful search engine company in China, called Baidu (http://www.baidu.com ). Baidu founder Li Yanhong said that as early as 1996, he applied for a patent named hyperchain analysis. PageRank's principle is the same as that of hyperchain a

　　Each system will have his life cycle, from life to death, through the three stages of adolescence, middle age and old age. 　　The management of complexity runs through the whole life cycle of the system, just like the natural choice of evolution, constantly optimizes the system and keeps the system alive. The initial stage of the system is to complete the construction of 0 to 1 to verify the business model or to do the smallest demo product. This is the time and cost of priority, and that is fa

"Sports", people who like football should put the results of football at the top, and those who like basketball should put the results at the top. The Sorting Technology of search engines should also develop towards solving these two problems: Semantic Relevance and sorting personalization. The former requires a comprehensive natural language processing technology, and the latter needs to record huge Visi

1. @Controller, any Java class can be used as a controller, as long as it is @controller annotated 2. @RequestMapping 2.1@requestmapping can modify Java classes* The request is from the original ******/hello.do* Become

Toggle, no Reload1. Activity Statement android:configchanges = "Orientation|keyboardhidden|screensize"Up to API there is a new value to the Configchanges attribute,screenSizeSo if you ' re using large screens make sure to add ScreenSize in your

Source: http://dantvt.spaces.live.com reader-Writer Problem Writer Priority and fair competition multi-process mutual access to shared resources and Process Synchronization of the classic problem has a file F, access is required for multiple

1.redis installation: Download the ZIP package, unzip, and then CMD terminal to enter the Redis installation root path 1.1 Starting the Redis server: Redis-server.exe "redis.windowws.conf"--"" in parentheses can be added without 1.2 (need to open

What is TCP/IP, UDP? TCP/IP (transmission Control protocol/internet Protocol) is a protocol/inter-network protocol, an industry-standard set of protocols designed for wide area networks (WANs). UDP (User data Protocol, Subscriber Datagram

Pre-build preparation: For Eclipse, Myeclispe Coding tool, install SPRINGMVC plug-in, can easily configure Springmvc.xml development, automatically complete the specified configuration. 1. Download Spring's Elcipse plugin to enter spring's

1.Ant-style request mapping 2.Rest Style Increase (POST) Delete (delete) change (PUT) Check (GET) but a label or form form, all only post, get two kinds of requests So : Introduce Hiddenhttpmethodfilter filters to filter all requests: GET Request--

Is Reading Notes not original? -Page 30 However, as humans, we should not be so closely integrated with technology, but more closely integrated with other things, that is, nature. At the deepest level, human existence should be integrated with nature, our initial environment, and those conditions that originally made us human. ============ -Page 36 Today, machines are used to produce machines, and they become the parents of similar machines in

Computer encryption anti-tracking technology ciphertext Technology 1) Tracking TechnologyWe all know that DOS has a powerful dynamic tracing debugging software debug, which can implementProgramIn fact, this is because of the single-step interruption and breakpoint interruption, and most of the current tracing debugging software uses these two interruptions. One-step interruption (int1) is an interruptio