JavaScript

-use = = = instead of = =the = = (or! =) operator automatically performs type conversions when needed. the = = = (or!==) operation does not perform any conversions. It compares values and types, and is considered better at speed than = =.--using

JavaScript type conversions: Value Convert to: String Digital Boolean value Object Undefined "Undefined" NaN False Throws TypeError Null "NULL" 0

I. Basic usage1. To use the element, you must first set its width and Height properties to specify the size of the area that can be plotted. You can add a style to the element through CSS, and if you don't add any styles or do not draw any graphics,

Sometimes you need to get the size of the picture, which needs to be done after the picture is loaded. There are three ways to achieve this, as described below.First, the Load event charset="Utf-8"> Img-load Event id="IMG1"

Last week, JQuery 1.9 was released.This is the last new version prior to version 2.0, with a number of new features, one of which is support for source Map.To access Http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js, open the

JavaScript is a literal-translation scripting language, which is a dynamic type, a weak type, a prototype-based language, and a built-in support type. Its interpreter, known as the JavaScript engine, is widely used as a scripting language for the

1. In HTML, the form is represented by the element, whereas in JavaScript, the form corresponds to the htmlformelement type. Htmlformelement inherits the HtmlElement, and thus has the same default properties as other HTML elements.Unique properties

2015.11.27 Client-side scripting language JavaScript. (The reason for calling this name.) Want to marrying up, hope to become as common as him. The relationship between names is similar to Lei Feng and Leifeng Pagoda, and the relationship between

In particular, the following is the Dahne technology web front-end lecturer Zhang Dong Zhang's original notes, without permission, can not be transferred to other commercial, only for learning.1. What is javascript: languages that specialize in web

Considering the article is too long, not easy to read, here to separate the second, if there is a follow-up, every 15 points of knowledge is divided into one ...#29-Use cached memory to let recursive functions run fasterThe wave non-tangent sequence

Native javascript implements addClass, removeClass, hasClass function, addclasshasclass Native addClass, removeClass, hasClass function, no jquery Class. js Function hasClass (ele, cls) {return ele. className. match (new RegExp ('(\ s | ^)' + cls

Ultra-practical JavaScript form code snippet, javascript form I sorted out some useful Javascript form code segments and shared them with you for your reference. The specific content is as follows: 1. Multiple window. onload Methods The onload

Examples of foldable level-2 menus implemented by JavaScript + CSS, javascriptcss The examples in this article describe the foldable level-2 menu implemented by JavaScript + CSS. We will share this with you for your reference. The details are as

Display/hide fixed position elements and window elements as pages scroll 0. Effect An element is displayed at a fixed position in the window. When the page height is greater than a certain height and the page is scrolled down, the element is

Improved jquery processing mechanism and improved jquery Mechanism Using the jQuery selector is much simpler than using the traditional getElementById () and getElementsByTagName () functions, and can avoid certain errors. See the following example:

A required condition branch for javascript every day. Hello everyone, let's talk about operators in the previous section. Today's task is to explain the logic condition branches and loops.Let's first simulate a logical block. let's just use the

Css table, css The border-collapse attribute sets whether the border of a table is folded into a single border or separated:1 2 3 4 9 10 11 12 13 first column 14 second column 15 16 17 first column 18 second column 19 20 21 22 2

A complete example of the beautiful heart line effects drawn by javascript and an example of javascript This article describes how to use javascript to draw beautiful line effects. We will share this with you for your reference. The details are as

Javascript implements Form Verification and javascript implements forms This article provides examples to illustrate the code for javascript Form Verification and share it with you for your reference. The specific content is as follows: : Code:

CSS sets horizontal and vertical center and css Center for row and block-level elements. CSS settingsLine ElementHorizontally centered Div {text-align: center}/* the row elements in the DIV are horizontally centered */   CSS settingsLine