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Fundamentals Selector | This symbolic band table selects the interpreter, that is, there is a match on the left and right sides of |. let tel = "010-12345678"; //Error Result: Only match either | left or right console.log(tel.match(/010|020\-\d{7,8}/)); //Correct result: so it needs to be used in the atomic group console.log(tel.match(/(01 ...

preface Corresponding blog posts: Click here to jump to get more information about this article There is a Google verification code in front. Now let's crack the relatively simple image verification code. (digital and mixed Chinese and English) Plug in verification code Google plugin needs to be loaded AutoVerify This recognition is a simp ...

An article makes you understand Reflect and Reflect metadata(JavaScript) introduction We often see the use of Reflect in Javascript, but we always don't understand the difference between it and Object. In addition, we don't often use it in work, so we are in a state of ignorance. So make up your mind to use this article to understand it thoro ...

1. Sprites In order to effectively reduce the number of requests received and sent by the server and improve the loading speed of the page, CSS wizard technology appears Core principle: integrate some small background images in the web page into a large picture, so that the server can only request one time 1.1 use of Sprite diagram Us ...

We discuss from several dimensions: 1. The essential difference between for loop and forEach. 2. The syntax difference between for loop and forEach. 3. The performance difference between for loop and forEach. Essential difference for loop is a loop method that existed when js was proposed. forEach is a method proposed by ES5 and attach ...

VUE components Basic concepts Component development: according to the idea of encapsulation, encapsulate the reusable UI structure on the page into components, so as to facilitate the development and maintenance of the project Component development in vue: vue is a front-end framework supporting component development, and the suffix of t ...

preface Array is one of the common data types in JavaScript. I'll make a brief record and summary about its operation methods here. This paper mainly includes: Create arrayDetermine whether it is an arrayClass array and array conversionArray de duplication You can choose to eat according to your own needs. Create array Creating an array ...

Built in object There are three kinds of objects in JavaScript: custom object, built-in object and browser objectThe first two objects are the basic content of JS and belong to ECMAScript; The third browser object is unique to JS, which explains the JS APIBuilt in objects refer to the built-in objects of JS language, which are used by develope ...

preface Array is one of the common data types in JavaScript. I'll make a brief record and summary about its operation methods here. This paper mainly includes: Create array Determine whether it is an array Class array and array conversion Array de duplication You can choose to eat according to your own needs. Create array Creating an array i ...

1, What are instructions The essence of instructions is HTML custom attributes. HTML has two kinds of attributes, one is inherent attribute and the other is user-defined attribute. Inherent attributes refer to the attributes that support the functions of HTML, such as id, class and title. Custom attributes are usually used to store some data ...