Programming VIP

1. Why do we need broadcasters? Broadcasting in life: Radio: to send a certain channel of radio messages, 50 mhz; Radio: adjust to a certain channel to receive broadcast messages; Radio in android applications: A service built into the system that sends events (insufficient power, full power, start-up) as a broadcast message to other recip ...

This article is translated from MDN (Mozilla Developer Network): Original address: MDN Translation Address: shixinzhang's blog After reading this article, you will learn: Lexical Scope closure Callback of Closed Real Battlefield Scene Simulating Private Methods with Closures Common errors create closures in loops Attention performan ...

30 minutes to know Vulkan API This article is written for readers who are familiar with the existing concepts of D3D11 and GL, but want to know more about how they are implemented in Vulkan. So this article will end with a conceptual tour of Vulkan. The article does not seek to be easy to understand (in order to understand the obscure c ...

Catalog Explain simple form Anonymous type form Conditional form Specified type form Screening Forms Shaped form Nested form Local invocation method form Distinct Form Explain The query expression select is placed at the end of the expression, which is similar to the function of select in the SQL command but different in locatio ...

The following is an introduction to the components in Preference Activity. PreferenceScreen: Setting pages can be nested to form secondary settings pages and titles can be set with Title parameters (this can also be used as a separate activity to start the settings interface, not yet studied). PreferenceCategory: A certain set of related ...

Through the first three lectures, you should be able to do so. 1. Have a resume with confidence that you can change your job at any time. 2. Know the correct posture of learning js 3. Understanding the global object, the global context, knowing that there is pre-parsing and doing at least 50 interview questions at the same time. 4. Be proficie ...

start Say last weekend idle egg pain, suddenly want to know how to deal with the front-end gesture, so as to solve their own knowledge blind spot, and began to gnaw the source code... And record it. A gesture Complex gestures in our front-end pages should be rare, usually dragging, double-clicking, zooming in and out of these, but the rational ...

Foreword: This is the author's own understanding and arrangement after learning. If there are any mistakes or doubts, please correct them and I will keep updating them. There are three ways to introduce CSS: interline style, internal style and external style. In practice, when we use javascript to manipulate CSS styles: When we change a few st ...

Hibernate supports SQLQuery (sql statements related to specific database platforms) and Query (hql) query mode, as well as Criteria object query mode. SQLQuery 1. Query results are mapped to map,: param parameterization public List<Map<String, Object>> findMapBySql(String sql, Map<String, Object> params) { SQLQuery s ...

Countdown. gif On the left is the output desk and on the right is the tableView. After clicking modal, a controller stops the timer. I. Main Functions For tableViewCell, there is always the problem of multiple cell s randomly timing, so a tool class is written.It encapsulates stop countdown and start countdown. Provides the countdown unit t ...