• My notes – BFC knowledge


    What is BFC? BFC(block formatting contexts) a block level formatting context, which is a pageCSSPart of the visual rendering,An area used to determine the layout of block level boxes and the extent of floating interaction 。 Creation of BFC Root element(<html> ) Floating element(floatNot fornone ) Absolute positioning element(positionbyabsoluteorfixed ) Table titles and cells(displaybytable-caption , […]

  • PHP 8.0 source code compilation and installation & JIT taste


    sketch PHP 8.0 alpha 1 has been released on June 25, 2020. Today, I’d like to share with you a simplified PHP 8 source code compilation and installation method, and a quick taste of the new features of PHP 8.0 JIT. This is a general PHP source code compilation and installation method. Other PHP versions […]

  • On chain governance scheme — Analysis of qtum DGP


    introduction Judging from the recent BCH bifurcation process, the governance of pow type chains such as bitcoin has been completely monopolized by large-scale mine owners (ore bullies), and has become a arena for the power and profit of mining bullies, which has greatly damaged people’s belief in the decentralized transformation of blockchain. Although Ethereum has […]

  • Three characteristics of object oriented in golang


    Those who have studied Java language know that object-oriented mainly includes three basic characteristics: encapsulation, inheritance and polymorphism. Encapsulation means that the running data and functions are bound together. In Java, it is mainly completed by super pointer; inheritance means that classes can inherit properties and functions from each other; polymorphism means that the common […]

  • The value of the null column does not participate in the comparison


    If the database has a table emp: empno name   age001      lucy      22002      lily        null003      lilei       null004      lucy      null005      pear      null006      pear      null When executing SQL: SELECT empno FROM `emp` where age != 22; None of them returned; […]

  • Simple implementation of entityframework code first


    Review the implementation of EF code first, rookie essay is for reference only. Welcome to point out the mistakes and help the little brother grow up! Entity Framework is an ORM framework for. Net developers launched by Microsoft to implement the operations of creating, reading, updating and deleting single table data in database. Object relational […]

  • WKWebView loadRequest Crash


    Recently, during project development, a problem of random collapse of application was encountered. A WKWebView was referenced in a ViewController, and then the instance method loadRequest of WKWebView was invoked. NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:self.url]]; [self.webView loadRequest:request]; Then the code running to loadrequest crashes and reports an exception exc_ BAD_ Access. The last method […]

  • Recommend IOS open source carousel components


    recommend AppIn the indispensable advertising carousel map component, now open source out, I hope to help you! In the process of usingbug, will help solve the problem quickly! What are the characteristics To use a third-party library, first of all, you need to know what features the third-party library has and why it is worth […]

  • Ajax summary-02


    Analysis of Ajax request response process *All Ajax requests will be based on DOM (HTML element) events, through XHR (XMLHttpRequest) object to achieve asynchronous communication and local update with the server*Ajax Application programming steps:Step 1: create XHR object (XMLHttpRequest object) based on DOM event var xhr=new XMLHttpRequest(); Step 2: register XHR object status monitoring and […]

  • The difference between attr and props in jquery


    Foreword: we all know that attr and prop have the ability to obtain and change the attribute values in elements, but what is the difference between them? definition We are given an attribute through an attribute. 2. ` property ‘is a long-standing feature that does not need to be given by the outside world, and’ […]

  • ECMAScript and ECMAScript 2015


    ECMAScript and JavaScript ECMAScript is also a scripting language, usually abbreviated as es, which is usually regarded as the standard specification of JavaScript language. In fact, JavaScript is an extension language of ECMAScript, because ECMAScript only provides the most basic syntax. Generally speaking, it specifies how to write our code, such as how to define […]

  • Zooteam front end weekly issue 92


    Zhengcaiyun front end tabloid No.92 For more information on past tabloids, please visit:https://weekly.zoo.team 1.New features of ECMAScript 2020 The latest features added to JavaScript in ECMAScript 2020 by Thomas Findlay github.com/xitu/gold -m… translator: 2.leonardomso/33-js-concepts: ???? 33 concepts every JavaScript developer should know. ???? 33 concepts every JavaScript developer should know. – leonardomso/33-js-concepts 3.yangshun/front-end-interview-handbook: ???? Almost […]