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Exercise Parallax Rolling Example Introduce parallax In the process of web page rolling, multi-level elements are moved to different degrees to form a three-dimensional visual effect of the web page display technology.Simple stereoscopic effect can be achieved by generating different parallax between foreground and background when moving a scen ...

Concept: ACL is the abbreviation of Access Control List. The main purpose of ACL is to provide detailed permission settings other than the read, write and execute permissions of traditional owner, group and other. ACL can specify the permissions of r, W and X for a single user, single file or directory, which is very helpful for the use of sp ...

This article is basically rom Violation of Vuex, using easy-to-understand text, also deletes the original content. If you don't mind the above statement, you can continue to read this article and hope it will help you. To learn a new technology, you must be clear about the two W's,'What&Why'. "What is XX?"Why use ...

Analysis of runtime Running Mechanism in iOS http://blog.csdn.net/fuzheng0301/article/details/46898405 First, consider two questions: First question, 1) What is the mechanism of runtime implementation, how to use it, and what is it generally used for?   I'm not going to beat around the bush with you on this question. I'll ...

My Learning of Collection The first step is to know the relevant concepts. Sets are composed of a set of disorderly and unique items, and similar Set classes have been implemented in ES6. function Set() { var items = {}; //items are collections } The second step is to realize the relevant operation methods. First, the has(value) method is i ...

Recognize that you are still garbage After deleting all the previous articles and closing the blog, I feel that some articles I wrote before are too rubbish, so I will review them for my own amusement. It's a good thing to think of your own dishes. At least you know that you need to continue to learn, and at least you have the motivation to con ...

Scheduler is a url scheduler in Webmagic. It collects URLs (target Requests of Page) that need to be crawled from Spider processing and poll s the URLs to be processed to Spider. Scheduler is also responsible for error retry and de-processing of url judgment, as well as statistics of total pages and remaining pages. Main interface: Scheduler d ...

Generally speaking, Android animation can be divided into two categories, the original traditional animation and the attribute animation after Android 3.0. Traditional animation includes: Frame Animation and Tweened Animation. Let's talk about the use and characteristics of various animations. Frame animation: is the easiest kind of anima ...

Property name describe prototype Adding attributes and methods to objects constructor Returns an array object reference length Returns the number of array elements Method name describe Return Change the original array concat() Connect multiple arrays New array after connection N join('') Combines all elements in an array into ...

stay iOS UILabel is a commonly used control in programming. Here is a way to set the relevant properties of UILabel. Many iOS 6 programming starts with storyboard, and when UILabel is used, controls are dragged into storyboard to generate implementations. If you want to use code in - (void)viewDidLoad, such as [_label]. InititWithFrame ...