What is prototype? Summary of prototype instance usage

In JavaScript, you can use the Array constructor to create an array, or use the array literal [], the latter is the preferred method. The Array object inherits from Object.prototype, and executing the typeof operator on the array returns object instead of array. However,[] instanceof Array also returns true. In other words, the implementation of array-like objects is more complex, such as strings objects and arguments objects. The arguments object is not an instance of Array, but has a length attribute and can obtain values ​​through indexes, so it can be looped like an array. In this article, I'll review some of the array prototype methods and explore their uses. Loop: .forEach; Judgment: .some and .every; Distinguish between .join and .concat; Implementation of stack and queue: .pop, .push, .shift, and .unshift; Model mapping: .map; Query: .filter; Sorting: .sort; Calculation:

1. 10 recommended courses on creating arrays in PHP

##Introduction: In JavaScript, you can use the Array constructor to create an array, or use the array literal [], the latter is the preferred method. The Array object inherits from Object.prototype, and executing the typeof operator on the array returns object instead of array. However, []instanceof Array also returns true. In other words, the implementation of array-like objects is more complicated, such as strings objects and arguments objects. The arguments object is not A...

2. Summary of the aspects that need to be paid attention to when creating an array

Introduction: In JavaScript, you can use the Array constructor to create an array, or use the array literal [ ], the latter is the preferred method. The Array object inherits from Object.prototype, and executing the typeof operator on the array returns object instead of array. However, []instanceof Array also returns true. In other words, the implementation of array-like objects is more complicated, such as strings objects and arguments objects. The arguments object is not A...

3. Recommended articles about taking fixed lengths

Introduction: This article mainly introduces JavaScript string numbers left padding and right padding. Take a fixed length and truncate the extension function code. Friends who need it can refer to it. Sometimes our dates and other less than two digits are filled with a 0, etc. You can use this. Everyone should understand this, so I won’t talk nonsense. The code is as follows: String.prototype.padLeft =Number.prototype.padLeft = function(total, ...

4. Summary of the usage of fixed-length examples

##Introduction: This article mainly Introduced JavaScript string numbers left padding, right padding, fixed length, truncation extension function code, friends in need can refer to it. Sometimes our dates and other less than two digits are padded with a 0, etc., you can use this. Everyone should understand this, so I won’t talk nonsense. The code is as follows: String.prototype.padLeft =Number.prototype.padLeft = function(total, ...

5.

Introduction to JavaScript native array functions

##Introduction: in JavaScript , you can use the Array constructor, or use the array literal, the latter is the preferred method. The Array object inherits from Object.prototype, and the typeof operator returns object instead of array. However, instanceof Array also returns true. .. . ..., HTML5 China, China’s largest HTML5 Chinese portal

##6. Slow query problem caused by converting int type to varchar type in MySQL database

Introduction: In the past week, we have processed two slow queries that were caused by the inability to use the index when converting int to varchar. Create Table `appstat_day_prototype_201305` (` Day_key` Date Not Null DEFAULT '1900-01-01', `appKey` varchar (20) Not null default '',` user_total `Bigint (20) not null default '0',` user_act

7. ## abbreviation: The implementation of AJAX technology depends mainly on xmlhttprequest, but when we call it for transmission of asynchronous data, because XMLHTTP is a short -term process (after the processing of the process is completed), if the object is not packaged, the object is not packed. , you have to rebuild xmlhttprequest where it needs to be called, and it is really not a good idea to write a large section of code for each call. Fortunately, many open source ajax frameworks now provide solutions for encapsulating xmlhttp. The own prototype -.4.0.js is the mother version. Let's see how to encapsulate the XMLHTTP object into a reusable method. Develop WeChat Mini Program (5)

: ES6 pairs of Object, Array, String, Number, Math, math Many new APIs have been added to native objects. Object Object.prototype.proto: The object has the attribute proto, which can be called an implicit primitive...

9. Details Introducing the method of javascript using prototype to implement OOP inheritance

##Introduction: Using the prototype feature, you can easily The subclass inherits the methods and properties of the parent class. In the following example, Vegetable is regarded as the parent class, and Celery is regarded as the subclass. Vegetable has the attribute taste, method fun1, and method fun2. If it is defined again, it is the same as Vegetable.

10.

Detailed code examples of usage of Spring framework annotations

Introduction: Written in front: As we all know, among the JavaEE development frameworks, the Spring framework is the most used, and the positioning of annotations in the framework has become more and more obvious. To be a joke: If you can use a annotation, you must not solve a bunch of configuration and code; if you cannot solve it, then two annotations; (stabilize, do not spray ...) 1.@Component is a spring For general annotations, you can annotate any bean. 2.@Scope defines the scope of Bean, and its default scope is 'SINGLETON'. In addition, there are Prototype, Request, SE ..

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