JavaScript

1 //look at a piece of code first2 varA = 100;3 functionTest () {4 alert (a);5 varA = 200;6 }7 8 test ();9 /*Ten results: undifined One cause: The JS engine scans the script code block as it executes it. A declare all variables first, so when

/** * Chinese and English string interception * @param str to intercept the string * @param len to intercept the length * @param hasdot whether to increase the end of the string ' ... ' * @returns {string} * /c1>*/ functionmysubstring (str,

1. Data type,There are 5 simple data types (also known as basic data types) in javascript: Undefined, Null, Boolean, number, and string. There are 1 more complex data types--object,object essentially consist of a set of unordered name-value pairs.2.

Node objects are a single node, but sometimes a data structure is required to accommodate multiple nodes. The DOM provides two interfaces for deploying a collection of such nodes, namely NodeList and htmlcollection Definition on MDN:

Types of mouse event eventsMouse events refer to mouse-related events, mainly with the following.(1) Click eventThe Click event is triggered when the user clicks the mouse (or presses the ENTER key) on the element node, document node, window object.

assuming you really need to detect the browser type, using JavaScript is very easy to achieve. View DemoDownload Source from GitHubJavaScript has a navigator standard object that includes information about the browser's use.Navigator objects are

Code written in JavaScript must is executed from a document written in HTML. There is three ways of doing this:1. You can place the JavaScript between tags within the of the document:2.  A much better technique is to place your JavaScript code

1 functionMap () {2 This. elements =NewArray ();3 4 //get the number of map elements5 This. Size =function() {6 return This. elements.length;7 }8 9 //determine if the map is emptyTen This. IsEmpty =function() {

dom:document Object ModelD is for document:the DOM cant work without a document. When you create a Web page and load it on a Web browser, the DOM comes to life. The It takes the document, which has written and turns it into an object.  O is for

Javascript + CSS: webpage sliding door menu effect code with automatic switch, css sliding door This article describes the code of webpage sliding door menu effects that JS + CSS achieves automatic switching. Share it with you for your reference.

JavaScript implements the arithmetic square root algorithm-super simple code, javascript Arithmetic A few days ago, I saw a square root source code from Raytheon. I will not go into details about the principles. The source code is written in C

Awesome icon and css special font usage, awesomecss   As the first blog post, I am about to get angry. Okay, I will not talk nonsense. Yesterday, I found many of these Awesome icons in the project. I also found these files on the Internet after I

Javascript-an interactive javascript tutorialThis site also provides some other languages for you to learn. Playing in this interactive mode is much more impressive than reading a book. Record a point: the usage of javascript substring is somewhat

Json data parsing?? Json data, which can be opened online or downloaded using bejson What is JSON: JSON is JavaScript Object Natation. It is a lightweight data exchange format. Like XML, JSON is a widely used client-server interaction

JavaScript design pattern-Prelude (encapsulation and Information Hiding)3. encapsulation and Information Hiding: Information Hiding is used for decoupling and defining private data and methods. Encapsulation is a technology used to hide information.

Js fade-in and fade-out focus chart slide effect code sharing, js fade-in and fade-out This article describes the javascript fade-in and fade-out focus slides. Share it with you for your reference. The details are as follows:This is a

JQuery smooth rotation slide special effect code sharing, jquery special effect code This article describes jQuery smooth rotation slide effects. Share it with you for your reference. The details are as follows:This jQuery-based smooth rotating

Js image carousel special effect code sharing, js image play special effect code The examples in this article describe js image carousel effects and share them with you for your reference. The details are as follows:This is a javascript-based image

Js implements concise code for the TAB Sliding Door Effect and jstab sliding door code The example in this article describes the code for implementing simple TAB sliding door in js. Share it with you for your reference. The details are as

Examples of jquery dynamic navigation plug-in dynamicNav usage, This document describes how to use the jquery dynamic navigation plug-in dynamicNav. Share it with you for your reference. The details are as follows: This is a self-written jquery