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1. The match function wakes up the string with the specified regular expression function and returns the matching string prototype as an array: Stringobj.match (REGEXP) Parameter: Stringobj required option, need to go to match string regExp required option, The specified regular expression return value: If the G (Global match) option is not used, the first matched string, the location of the string, and an array of the original string are returned, and if the G option is used, an array of all ma

Original Address https://www.cnblogs.com/JetpropelledSnake/p/8982495.html http://www.runoob.com/python/os-walk.htmlThe Os.walk method is used primarily to traverse subdirectories and sub-files within a directory.Can get a ternary tupple (Dirpath, Dirnames, filenames),The first is the starting path, the second is the folder under the starting path, and the third is the file under the starting path.Dirpath is a string that represents the path to the directory,Dirnames is a list that contains the n

Recursive queries in SQL statements SqlServer2005 and Oracle two versions Before using Oracle, think of its recursive query is very useful, the study of SQL Server, found that it also supports recursive query in SQLTo illustrate:The SqlServer2005 version of SQL is as follows:For example, a table with ID and PID fields, ID is the primary key, PID represents its ancestor node, table structure and data:CREATE TABLE [AAA] ([ID] [int] NULL,[PI

One. Python's class attributes and instance properties are a point of attention1 classTestatt ():2AAA = 103 4 defMain ():5 #Case 16Obj1 =Testatt ()7Obj2 =Testatt ()8 Printobj1.aaa, obj2.aaa, Testatt.aaa9 Ten #Case 2 OneOBJ1.AAA + = 1 A Printobj1.aaa, obj2.aaa

the prototype chain of another object.For differences between the two methods, see JavaScript isPrototypeOf vs instanceof usage. Only use prototype chain for inheritance Disadvantages: 1. The prototype property of the reference type value will be shared by the instance; 2. When creating a child-type instance, parameters cannot be passed to the super-Type constructor. functionFather(){this.name ="father";this.friends = ['aaa','bbb'];}functionSon(){}So

: Cal 2016//view the Year 2016 calendarUser's environment variable:/home/user/.bash_profileSystem Environment variables:/etc/profileConfigure the. bashrc file to specify that some programs start automatically when the user logs on:One user on the system:/home/user/.BASHRCEntire system (all users):/ETC/BASHRCLinux Start-Up process Analysis BIOS self-test; Start Grub/lilo; Run the Linux kernel and detect the hardware; Run the system's first process init; Init reads the inf

: JavaScript isprototypeof vs instanceof usage Using only the prototype chain to implement inheritance Disadvantages: 1. The prototype property of the reference type value is shared by the instance; 2. You cannot pass arguments to a superclass constructor when you create an instance of a subtype Functionfather () { this.name = "Father"; This.friends = [' aaa ', ' BBB ']; } Functionson () { } Son.prototype = Newfather (); Son.prototype.constr

Command operations for Linux1. Daily Operation Command* * View your current working directoryPwd* * Time to view current systemDate* * See who is online (who logged in to the server)Who view current onlineLast view recent log in history2. File System operation**LS/view child nodes (folders and files) information in the root directoryLs-al-a is show hidden file-L is displayed in a more detailed list form* * Switch DirectoriesCd/home* * Create Foldermkdir AAA