or using DOS 3.0 or later versions.1987–1990:windows 2.0–2.11-window More, fasterWindows 2.0 DesktopWindows 2.0Microsoft released Windows 2.0 with desktop icons and extended memory on December 9, 1987. With improved graphics support, users can now overlap Windows, control screen layouts, and use keyboard shortcuts to speed up work. Some software developers have written their first Windows-based program for this release.Windows 2.0 is designed for the
program has the following functions: The text box requires the input of date information, the date is limited to January 1990 ~2049 December, and the date is set by 6-digit characters, the first 4 digits of the year, the last 2 digits for the month, the program needs to verify the date validity of the input.The method of equivalence class partitioning and boundary value analysis are used to design the test cases for the "date checking function" of th
website (http://nfgis.nsdi.gov.cn/nfgis/chinese/c_xz.htm) Download. (ii) Remote sensing data and its products1. Landsat remote sensing data for western China: including MSS before and after 1979, TM before and after 1990 and etm+ data around 2000, most of the data is consistent with the Landsat data in the centre, and some data are collected by the sub-centre. Online2. Western China aster Data set: It is a sub-center with the support of the Glims pro
Over the past few decades, a large number of programming languages have been invented, replaced, modified, or grouped together. Each language is always born in controversy and dies in evolution. And the creators of these languages, none of them are the iconic characters in the programming world, keep the banner of exploration moving forward. Admiration has prompted the creation of this article, which collects and shares the stories of the most successful and popular 12 programming languages and
A method that binds a function in an object called this object.In JavaScript, the object is defined as such;var Guagua = {Name: ' Melon ',birth:1990};However, if we bind a function to the melon, we can do more things.var Guagua = {Name: ' Melon ',birth:1990,Age:function () {var y = new Date (). getFullYear ();return Y-this.birth;}}Guagua.age; function Guagua.age ()Xguagua.age (); This year the call is 25, a
Over the past few decades, a large number of programming languages have been invented, replaced, modified, or grouped together. Each language is always born in controversy and dies in evolution. And the creators of these languages, none of them are the iconic characters in the programming world, keep the banner of exploration moving forward. Admiration has prompted the creation of this article, which collects and shares the most successful and popular 12 programming languages and their creators
(American Nation standards Institute, ANSI) began to develop the C language standard, completed in December 1989, and released in the spring of 1990, called ANSI C, sometimes referred to as C89 or C90.The father of C language--RickyBefore we learn the C language, let's look at the history of C language first.C language is a universal, modular, programmatic programming language, is widely used in operating systems and application software development.
areas.About POSIXPOSIX represents a portable operating system interface (Portable Operating system Interface, abbreviated as POSIX), and the POSIX standard defines the interface standards that the operating system should provide for applications. is the generic term for the series of API standards that IEEE defines for software to run on a variety of UNIX operating systems, formally referred to as IEEE 1003, and the International standard name is ISO/IEC 9945.The POSIX standard is intended for
Drawing intuitively, it is essential to further select a time series analysis model, in order to show more clearly the regularity of the timing data (including the trend, the regularity of the change (one week, one months, one year, and so on) and the periodic pattern. The following is mainly based on the pandas library summarizes what common diagrams can be used for analysis. There are a total of the following:
Linear chart
Histogram and density graphs
Box-shaped diagram
He
, you can also specify a relative date for each parameter by using a numeric expression that represents the number of years, months, or days before or after a day.
The following sample uses a numeric expression instead of an absolute date. Here, the DateSerial function returns the date of 10 years (1990-10) 2 months (8-2) and one day (1-1) before August 1, 1990: May 31, 1980.
DateSerial (
, second=0}) {return
new Date [year + '-' + month + '] + day + ' + hour + ': ' + Minute + ': ' + second);
}
Only three attributes of year, month and day are required
builddate ({year:2017, month:1, day:1});
Sun 2017 00:00:00 gmt+0800 (CST)
Method
A function bound to an object is called a method
var xiaoming = {
name: ' Xiaoming ',
birth:1990,
age:function () {
var y = new Date (). getFullYear ();
return y-this.birth;
In recent time, when dealing with shell scripts, encountered time processing problems. The addition and subtraction of time, as well as the calculation of timing.
1. Time plus minus
The way to do this is to turn the base time into a timestamp, and then you need to add or change time to seconds.
For example: 1990-01-01 01:01:01 plus 1 hours 20 minutes
Processing method:
A. Converting the base time to time stamp
time1=$ (Date +%s-d '
A. JSON understanding
1.json (JavaScript Object notation): JavaScript Object notation, which uses the syntax of JavaScript objects to represent object data, is a format for storing and transferring data, and its advantages are easy to read, easy to parse, It has the advantage of being smaller, faster, and easier to parse than traditional XML. -See also the two for more details. How to generate JSON data using Java
1. Using the Jsonobject class in the JSON API in the Org.json jar packageThe Mave
We've created websites and software to show people information that can be anything: a company's product list, vacation photos, or instant messages from friends, and at this point, more information is presented to you than ever before in history.
All this information has many positive effects, but it also poses challenges. " The cost of information is obvious, it consumes the attention of the receiver of the message ... The richness of information brings a scarcity of attention "(Simon 1971) Wh
Condition Between...and ... (includes upper and lower limits)Select * fromStudentSelect * fromStudentwheres#between 1 and 3Select * fromStudentwhereSagebetween '1989-01-01' and '1990-05-20'InchSelect * from Student Select * from where inch (' Wang Ju ', ' Qingshou ')Like ("%" stands for any one or more characters, "_" stands for any one character)Select * from Student Select * from where like ' % Cloud ' or like ' Zhao _ 'Case...when
the primary key.NDB Cluster internal actual use T-tree Structure implementation indexQuery types that can use the B-tree index in MySQL:CREATE TABLE people (last_name varchar () NOT NULL,first_name varchar () NOT NULL,DOB date NOT NULL,Gender enum (' m ', ' F ') is not NULL,Key (Last_name,first_name,don)) Engine=myisam;1. Match Full nameWhere last_nam= ' a ' and first_name= ' B ' and dob= ' 1990-01-01′2. Match the leftmost prefixWhere Last_name= ' a
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