head first javascript programming pdf

Transfer from Nanyi http://www.ruanyifeng.com/blog/2012/04/javascript_programming_style.htmlNanyiDate: April 27, 2012Douglas Crockford is the JavaScript authority, and the JSON format is his invention.Last November he had a speech (Youtube) about what a good JavaScript programming style was.I highly recommend this speech, which not only helps to learn

. If you want to test whether the browser supports DOM, you can simply judge Script Var isSupportDOM = !! Document. getElementById; // the inverse of the two elements. This is already mentioned in the previous section, which indicates forced transformation. Alert ("your browser" + (isSupportDOM? "": "No") + "supports DOM! "); Script Ii. DOM tree Note: the root of the DOM tree is the document root-document. since DOM is a tree structure, they naturally have the following relationships: Root N

System Learning JS,Get started with JavaScript advanced programming, by learning jquery or angularjs source.Chapter 1th Introduction to JavaScriptThe purpose of the 1.JS is to handle some of the input validation actions that were previously responsible by the server-side language, such as Perl,By Netscape-led development, then Microsoft's IE still can not dominate. Originally called LiveScript, the media st

Original address: http://www.imooc.com/wenda/detail/243523The JavaScript scripting library is a pre-written library in JavaScript that facilitates our development of JavaScript-based applications, especially for Ajax and other web-centric technologies. JavaScript is used primarily to write functions that are embedded o

Transferred from: http://www.ruanyifeng.com/blog/JavaScript modular Programming (i): How to format a moduleNanyiDate: October 26, 2012As Web sites become "Internet Applications", JavaScript code embedded in Web pages is becoming larger and more complex.Web pages are becoming more and more like desktop programs, requiring a collaborative team, schedule management,

repeatedly. Workaround1. Release the event handler before removing the element. The efficient use of event delegates does not directly add event handlers to the elements that need to be deleted, but instead delegate to high-level elements.2, uninstall the page, through the OnUnload event handler to remove all the event handlers, to reduce the amount of work to remove, you can effectively use the event delegate. So it seems that something added via onload needs to be removed via onunload.

3 threads, a JavaScript engine thread, an interface rendering thread, a browser event-triggering thread, and, among other things, some executed threads. such as HTTP request threads, These asynchronous threads produce different asynchronous Events.Interface Rendering Thread:The thread is responsible for rendering the browser HTML interface element, which executes when the interface needs to be redrawn or because of an operation that causes reflux (re

to implement1. The script tag has an extended attribute Defer,defer property indicates that the scripts contained in this element do not modify the DOM, so the code can be safely deferred (but it is not compatible with all browsers)The script tag with the defer attribute can be placed anywhere in the document, and the corresponding JavaScript file will start downloading when the page resolves to the script tag, but will not execute until the DOM is l

SetTimeout and SetInterval of JavaScript asynchronous programmingin the case of asynchronous programming, I will mainly from the following three aspects to summarize the asynchronous programming ( Note: Special explanation: is summed up, I am also a rookie, so the summary is not good, please Daniel a lot of forgiveness! )1. settimeout and SetInterval analyze the

SetTimeout and SetInterval of JavaScript asynchronous programmingIn the case of asynchronous programming, I will mainly from the following three aspects to summarize the asynchronous programming ( Note: Special explanation: is summed up, I am also a rookie, so the summary is not good, please Daniel a lot of forgiveness! )1. settimeout and SetInterval analyze the

Javascript Modular Programming Author: Ruan Feng time: 2013-01-08 18:04 read: 7,632 recommendations: 40 original link [favorites]As Web sites become "Internet Applications", Javascript code embedded in Web pages is becoming larger and more complex.Web pages are becoming more and more like desktop programs, requiring a collaborative team, schedule management, unit

types are string,number,null,boolean,undefinedReference data types are Object,array, respectivelyA primitive type value refers to a simple data segment, whereas a reference type value refers to an object that may consist of multiple values. When assigning a value to a variable, the parser must determine whether the value is a base type value or a reference type.The value of a reference type is an object that is saved in memory. Unlike other languages, JavaS