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Intersection selectorUnion selectorDescendant Selectors Child Selector Adjacent Sibling Selectors attribute selectors Intersection selector The intersection selector consists of two selectors directly connected. The first selector must be an element selector, and the second selector must be a class selector or ID selector. The two selectors ...

1, Foreword The powerful effect of css3 animation is self-evident. Since its emergence, it has been hot, and its advantages and disadvantages with js animation have always been the topic of debate in the front-end industry. There is no doubt that the emergence of css3 animation reduces the difficulty of realizing animation effect to a certain ...

Important thing to say: every word is knocked by pickup hand. I hope you can read and understand pickup's thoughts when writing a blog word by word. I hope you have something to gain, thank you! This is the first article about redis, because redis plays an important role in our work. Later, I will write about the persistence of redis, the ...

Production consumer queue is used for multi node distributed data structure, production and consumption data. The producer creates a data object and puts it in the queue; The consumer takes a data object from the queue and processes it. In ZooKeeper, queues can be implemented by creating multiple child nodes under a container node; When creatin ...

Intersection selectorUnion selectorDescendant Selectors Child Selector Adjacent Sibling Selectors attribute selectors Intersection selector The intersection selector consists of two selectors directly connected. The first selector must be an element selector, and the second selector must be a class selector or ID selector. The two selectors ...

Title Description You are given an integer array nums and an integer target. You want to build an expression out of nums by adding one of the symbols '+' and '-' before each integer in nums and then concatenate all the integers. For example, if nums = [2, 1], you can add a '+' before 2 and a '-' before 1 and concatenate them to build th ...

Dubbo is a framework for remote invocation. For a service provider, it exposes an interface for external consumers to invoke, Do you need any special processing for whether the provider can call this interface? This article will share Dubbo's implementation mechanism of local calls and how to turn on and off local calls. The injvm supports lo ...

preface How to verify parameters? Lu Zhu's projects a long time ago were "if else" one by one on the front-end page. Later, he used a series of front-end verification frameworks, such as "layui" and "iview". Several style attributes can be easily done. It's really beautiful. Back end validation So here comes the ...

Mind map closure Before understanding closures, let's learn about the memory release of the parent scope and stack. Concept of parent scope Where is the parent scope of a function created and who is the parent scope var a = 10 function foo(){ console.log(a) } function sum() { var a = 20 foo() } sum() /* output 10 / ...

ArrayList overview Hello, everyone. Today, let's introduce ArrayList. When it comes to ArrayList, many people know that its bottom layer is implemented by array, and the thread is unsafe. When it comes to its characteristics, they will say that it is fast to find and slow to add and delete, because everyone recites the interview questions. Let ...