• JavaScript monitor combination button


    JavaScriptMonitor combination button   by:Give a guest QQ:1033553122   1.   thinking       As shown in the figure, by listening and printing the Keydown event of the keyboard, we can get the content of the diagram, When the combination key pressed contains the CTRL key, the ctrlkey key will be displayed as true; When […]

  • Apple releases Chrome browser extension for icloud Keychain on Windows


    According to foreign media, the Chrome extension developed by apple for icloud password has been released. Now users can download it from Google’s Chrome online app store. Its main function is to let you use the password stored in icloud. “Icloud passwords allows you to use the same powerful Safari password that you created on […]

  • What are the difficulties of lucky draw? Highlights


    Business requirements Through the form of activities, attract users to draw credit for Jingdong finance, bring the number of users for car owner service, increase the number of car binding, and transform Jingdong financial users into car owner users.Through the lottery, we can use some incentives and incentives to encourage users to use our app […]

  • Solution to multiple primary key defined error in MySQL


    There are two ways to create a primary key: Create table name( Field name type, Field name type, …… primary key(name) ); Or is it Create table name( Field name type primary key, Field name type, …… ); But note that if you want to create a composite primary key, you can’t use the second […]

  • Windows 10 uses screen keyboard


    Link to the original text:http://xiaoheidiannao.com/articles/Screen-Keyboard.html More computer skills can be found at:http://xiaoheidiannao.com/articles/Screen-Keyboard.htmlCheck it out catalog introduce Typing mode Numeric keypad Opening method introduce The screen keyboard comes with windows 10Software, which allows users tomouserealizationkeyboardThe function of. On screen keyboardwindowWill be displayed at the top of the screen, otherSoftwarewindowIf it overlaps with the screen keyboard, it […]

  • Spring redis session custom key and expiration time


    For distributed applications, the first problem is the storage of session. The solutions are as follows Using spring session, it can store the session where you want, such as redis, mysql, etc Using jwts, it uses algorithms to verify the validity of the token, whether it is expired, and the token cannot be forged, and […]

  • [development experience] button monitoring with flutter


    In development, sometimes it is necessary to monitor key events, which is supported by flutter itself and does not need to be implemented in the underlying platform native code. Flutter monitors key events of mobile phone / remote control / keyboard Flutter to achieve key monitoring, direct useRawKeyboardListenerthisWidgetThen: RawKeyboardListener( Focusnode: focusnode(), // focus onKey: (RawKeyEvent […]

  • Problems and solutions in the implementation of Tetris with jquery


    Record the problems when writing this game. When the key is pressed, it is forbidden to trigger repeatedly Demand: when the key is pressed, the speed will be reduced by 300 on the basis of the current value, speed – = 300There is a problem: when the key is pressed and held, speed will continue […]

  • PI Zi Heng Bi monthly No.21


    Bimonthly: the 21st issue Here we share some interesting projects / tools and some hot news in the embedded field. The Lunar New Year is divided into 24 solar terms. We hope to release one issue on time on the day of each festival. This journal is an open source projectJayHeng/pzh-mcu-bi-weekly)Welcome to issue, contribute or […]

  • PHP encryption and decryption, refer to discuz


    <?php /** *Encryption key */ define(“ENCRYPT_KEY”, “sqltest1179631111”); //Encryption $password = “123456”; $enCryPass = demoEncode($password); var_dump($enCryPass); //Decryption $deCryPass = demoDecode($enCryPass); var_dump($deCryPass); /** *Encryption *@ param $password string password before encryption * @return false|string */ function demoEncode($password) { return authCode($password, “ENCODE”, ENCRYPT_KEY); } /** *Encryption *@ param $encrypass string password to decrypt * @return false|string */ function […]

  • Explain in detail the installation of sql2012 error could not open key… Solutions


    [foreword] Before, due to the wrong operation of Xiaobian, an item about SQL in the registration form was deleted by mistake. What was deleted was also forgotten. At that time, it was to solve a SQL problem, but the problem was not solved. Instead, SQL was unable to be repaired, installed or unloaded. However, due […]

  • Very simple matrix scanning program of 51 single chip microcomputer


    /*Key position definition of key*/ unsigned char code anj[4][4] = { 1, 2, 3, 10, 4, 5, 6, 11, 7, 0, 9, 12, 13, 8, 14, 15, }; char ScanKey() { Char key = – 1; // the assignment is used to judge if the key is not pressed unsigned i,j; for (i = 0;i […]