JavaScript

I. Preface when there are too many images requested on a page, and the images are too large, the page access speed is very slow, and the user experience is very unfriendly; lazy loading using images, this can reduce the load on the server and

JavaScript has two special data types: undefined and null. The following section describes the null judgment and the undefined judgment. The following is an incorrect usage: varexpundefined; if (expundefined) {alert JavaScript has two special data

Ext indicates that there are two ways to bind data to treeStore. One is the root attribute. The code is as follows: root: {expanded: true, text: & quot; myRoot & quot;, children: [{text: & quot; Child1 Ext indicates that there are two ways to bind

I recently read an article about the infinite JSON folding menu. I feel that it is well written and I have also studied the code, so we also made a demo using our own encoding method. In fact, this menu item is very common on our website or project

I have been engaged in C, assembly, C ++, C #, Java, JavaScript, and PHP for three years since I got started with the first Programming Language C, there are also some things like HTML and CSS. There is never a language that makes me look like a

Original article: UsingCustomIconsinYourExtJSApp Author: LeeBoonstraLeeisatechnicaltraineratSenchaShe 'slocatedin=damandhasexperienceinbothfront-endandba Original article: Using Custom Icons in Your Ext JS App   Author: Lee BoonstraLee is a

JavaScript web communication 2013-12-1722: 01 byBarretLee, 259 reading, 2 comments, favorites, editing web communication, a very large topic, also involves a wide range. Because I recently learned some web communication knowledge in javascript, I

[Note]: record your opinions on call and apply in javascript. Some things will be repeatedly written and written. Why? It's just because I don't know enough about it. The so-called good memory is not as bad as writing a pen, and at the same time, I

Var $ email_regw + ([-+] w +) * @ w + ([-] w +) * w + ([-] w +) * $; var $ int_reg ^ d + $; var $ float_reg ^ d + (d {1, 2 })? $; Var $ time_reg ^ ([0-1]? [0-9] | 2 [0-3]): [0-5] var $email_reg = /\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;var

Environment ready, start to do the page, on the page to import the required files: & lt; scripttype & quot; text/javascript & quot; src & quot; jquery-1.8.min.js & quot; & gt; & lt;/script & gt; & lt; scripttype & quot; the text/javascript & quo

We have learned how to use seaJs to modularize javascript Functions. It is not enough to modularize javascript. We still need to use this module. So how can we call it outside? Now let's reveal the answer. Today's example will be in the server We

There are two defining methods for defining JavaScript Regular Expressions. Define a string that matches a string similar to & lt; % XXX % & gt. constructor varregnewRegExp (& amp; #39; & lt; % [^ % & gt;] + % & gt; & amp; #39;, & amp; #39; g & amp;

The self-encapsulated jsMap plug-in is very small, but basically implements the function. * ** Map * (function () {functionjMap () {private variable vararr {}; add thisputfunction (key, value) {arr [key] value;} to query The self-encapsulated jsMap

Recently, Fabricjs library, a magic html5canvas graphics library, provides object-oriented operations for graphics on the canvas. its official website is http: fabricjscom, which has done a good job in browser compatibility. However, there will be a

RegExp instance objects have five attributes: global: whether to perform global search. The default value is falseignoreCase: whether it is case sensitive. The default value is falsemultiline: multi-row search. The default value is falselastIndex:

Note 2 points for the JS Code I wrote below: 1. After each post, you will add one in the list. Currently, no ajax request is sent and no records are logged in the background. Therefore, the page will be refreshed and cleared. 2. the time is the

1. Basic Syntax: replace (regexp | substr, newSubStr | function [, flags]); 2. parameter description: 1) parameter 1: a) regexp: the content of a RegExp object that matches this regular expression will be returned by the second parameter & amp; 20540

I have already introduced some general usage of seaJs, the seaJs library is introduced, define is used to convert to a module, and the use is used to call the module. The external interface exports is used to find the module's external interface and

XML eXtensible Markup Language (TAG) is widely used in web development as a carrier for data transmission and storage. When we need to pass XML data to the front-end, we need to use javascript to parse it. Therefore, it is also common to use

Three methods of detecting objects are as follows: instanceof, constructor, and constructor name: 1) instanceofconsole. log ([1, 2, 3] instanceofArray); trueconsole. log ([, 3] instanceofObject); true although the constructor is prototype only...