JavaScript

1. Math Object1.1 Introduction   Math object is a mathematical object that provides mathematical calculations of the data, such as obtaining absolute values, rounding up, and so on. No constructors, cannot be initialized, only static properties and

The HTML5 provides a canvas object that facilitates drawing applications.JavaScript can run in a browser without the need to install a specific compiler;Based on the HTML5 and JavaScript language, applications can be written at any time,

JSONJSON (JavaScript Object Notation) is a lightweight data interchange format.It is based on a subset of JavaScript (standard ECMA-262 3rd edition-december 1999).JSON takes a completely language-independent text format, but also uses a similar

JQuery HTML usage (functions like innerHTML)In development, Ajax technology is needed to update the local area of the page, using AJAX to get an HTML snippet (string), and then use this HTML snippet as an argument to the jquery HTML interface of the

Javascript date processing functions 1. Solve 2000 problemsFunction Y2K (number) {return (number 2. Check whether the date is valid// When the input parameter is isdate (DD, mm, ccyy), it indicates the year, month, and day to be checked.// When

A scroll event is a very useful event. It is usually used when you flip pages or zoom in. However, it is relatively difficult to implement compatibility in various browsers. It is known as the most standard ff. It uses a private Implementation of

1. Obtain ArcGIS javascript API APIS.   2 Local deployment API Open the arcgis_js_api/library/install.htm installation instructions in the API package. This article is based on the instructions in English. Decompress the package and create an

Prototype Prototype is a JavaScript framework that aims to publish development of dynamic web applications. Homepage:

Examples of javascript functional programming and javascript programming This example describes javascript functional programming. Share it with you for your reference. The specific analysis is as follows: Javascript can write higher-order functions

Use C ++ to write extension modules for node. js and node. js extension modules Prerequisites: Install node. js, Python2.7, and visual studio 2013. Process:Install the GYP project generation tool npm install-g node-gyp.Create the test directory,

JS object attributes (check attributes, enumeration attributes, etc) 1. Delete attributes The delete operator can delete object attributes.   The Code is as follows: Delete person. age // that is, the person no longer has an attribute age. Delete

JQuery selector source code explanation (5): tokenize parsing process, jquerytokenize The following analysis is based on the jQuery-1.10.2.js version. The following uses $ ("div: not (. class: contain ('span '): eq (3) ") is used as an example to

Introduction to javascript Object-Oriented Programming and Object-Oriented Programming The ECMA-262 defines an object as a collection of unordered properties that can contain basic values, objects, or functions" The simplest way to understand an

Introduction to array features in JavaScript and javascript Array features Unlike Java, arrays in JavaScript have three features:   1. No type. The members of the array can be of any type, and the same array can also be composed of many different

Seven Bootstrap online editors are used to quickly develop responsive websites. Bootstrap has made responsive website development much easier. But what if you don't have to write all the code manually? What if you can freely select the Bootstrap

Install and deploy the Egret engine development environment in Mac OS X, osegret Overview Egret is developed based on TypeScript, while tsc is developed based on Node. js. Therefore, during the installation process, we must first install the basic

Use require ('crypto') to call the encryption module. The encryption module requires the underlying system to support OpenSSL. It provides a security credential encapsulation method that can be used for HTTPS security networks and common HTTP

JavaScript is becoming more and more popular. It can be said that it is one of the most prominent languages on the Internet. You can use it across platforms and Browsers without rejecting backend languages. There are many different development

1. discard the fractional part and keep the integer part parseInt (5/2) 2. rounded up. If there is a decimal number, add 1Math to the integer. ceil (5/2) 3, rounded down. math. round (5/2) 4, round down Math. floor (5/2) Math object method FF:

1. Ext. form. description of ExtJS form components supported by FormPanel: Xtype Ext. form. field. checkBox check box checkboxfieldExt. form. checkBoxGroup check box group checkboxgroupExt. form. field. comboBox drop-down list box... 1. Main form