JavaScript

Regular expressions (regular expression) are an object that describes the character pattern. The RegExp class of JavaScript represents regular expressions, and both String and REGEXP define powerful pattern-matching and text-retrieval and

//1 definition and use of anonymous functions//1.1 Assigning an anonymous function to a variable is performed by a variablevarbox =function() { return"Lee";} Box (); //"Lee"//1.2 Performing anonymous functions by self-executing//( anonymous

JavaScript code before running a similar compilation process is lexical analysis, lexical analysis is mainly three steps:1. Parameters of the analysis function2. Variable declarations for analytic functions3. function declaration expressions for

in general, the object in JavaScript is a pointer to prototype and a list of its own properties. only the constructor (object,function,array,date,string) has and will have a prototype property. The prototype chain inheritance is the creation of a

The following function implements one of the most basic picture preload effects we wantfunction Preloadimages (arr) { var newimages=[] var arr= (typeof arr!= " Object ")? [arr]: arr // Ensure that the parameters are always array for (var

One, JavaScript get HTML element width high1. The width and height are written in the style table, such as #div1{width:120px;}. In this case, the width can not be obtained by #div1.style.width, but by #div1.offsetwidth.2. Width and height are

JavaScript code compression refers to the process of removing all unnecessary characters from the source code without altering its functionality. These unnecessary characters typically include space characters, newline characters, comments, and

　　The hash algorithm functions as quickly as possible to find a value in the data structure. If the data is large, but there is a need to traverse the entire data structure to find the value, it takes too much time. Therefore, the hash table in the

Let's take a look at some of the problems that are often encountered in writing Ajax coding:1. Because Ajax is asynchronous, all code that relies on Ajax to return results must be written in the Ajax callback function. This inevitably forms a

AddEventListener () and removeEventListener () parsing, removeeventlistener AddEventListener () and removeEventListener () are used to process specified and deleted event handlers.All DOM nodes contain these two methods, and both of them accept

JQuery-based dynamic effects of text printing and jquery dynamic effects This article provides examples of the Code for jQuery to achieve the dynamic effect of text printing for your reference. The specific content is as follows: Subject html

New Feature 4 of ES6: deconstruct and value assignment of variables and new features of es6 This article describes the deconstruct and assignment of new features of ES6. We will share this with you for your reference. The details are as follows: 1.

New feature 5 of ES6: Data Structure instance analysis of Set and Map, and es6 instance analysis This example describes the data structure of Set and Map in feature 5 of ES6. We will share this with you for your reference. The details are as follows:

Vuex: an instance for understanding the usage of state, and a vuexstate instance 1. What is state? As mentioned in the previous article,VuexA repository contains many objects. WherestateIs the data source storage location, correspondingVueObjectdata(

Modify the default font color and input font color of input and select using js. The default word color of textarea and the color of the word after the focus is obtained. After the focus is obtained, the default color disappears. enter the content

Multi-file upload and preview plug-ins on H5 mobile phones, Based on zepto, it supports Multifile upload, progress, and image preview for mobile phones. (Function ($) {$. extend ($, {fileUpload: function (options) {var para = {multiple: true,

H5 image compression and upload instance, After receiving the request, I asked whether the front-end can compress the image? Some images are too large to be compressed on the server. I have never had this experience in consciousness. In the morning,

Vue form submission + ajax asynchronous request + paging effect, vueajax If you don't talk much about it, paste the Code directly. The specific code is as follows: asynchronous parameter upload --> --> return to the upload page

Explain how to use ES6 elegantly in the NodeJS project, and explain how to use es6 in the nodejs Project Node. js supports new features of ES6 (ES2015) In recent versions. The settings support more advanced features such as async and await. You only

AngularJS changes the element display status, while angularjs changes the element Preface This article describes how to use the ng-show and ng-hide commands provided by AngularJS to automatically listen to a Boolean variable to change the element