art of multiprocessor programming

. Append the txt2 to the emphasis. Append the emphasis to the para. Append the txt3 to the para. Append the para to the Testdiv element in the test.html document. 1Window.onload =function (){2 varPara = document.createelement ("P");3 varTXT1 = document.createTextNode ("This is");4 varemphasis = document.createelement ("em");5 varTXT2 = document.createTextNode ("My");6 varTXT3 = document.createTextNode ("content.");7 Para.appendchild (TXT1);8 Emphasis.appe

(attribute,value) below an example:1 var shopping = document.getElementById ("purchases"); 2 shopping.setattribute ("title", "a list of goods");Fourth ChapterChildNodesThe Element.childnodes property can be used to get all the elements of any one element, which is an array containing all the child elements of this element, in the following example:1 var body_element = Document.getelementbytagname ("body") [0]; 2 Body_element.childnodes 3 document.getelementbytagname ("body") [0].childnodesNodeT

page content asynchronously.With Ajax, you can only update a small part of the page. Other content-logo, navigation, head, foot, no reload.The main advantage of Ajax is that requests to the page are sent asynchronously to the server. The server does not respond to the request with the entire page, it processes the request in the background, while the user continues to browse the page and interact with the page. Your script can load and create page content on demand without interrupting the user

JavaScript code must be executed through the html/xhtml document, and the first way is to put the JS code between the to put the , allowing the browser to load the page fasterPS: Browser page load order: Please read this articleJS Note: 1,///2,/* 3, JS can be used JS allows programmers to directly assign values to variables without prior declaration, the most efficient declaration and assignment practices: var mood= "Happy", age=33;JS is a weakly typed language, meaning that programmers can cha

() { if(document.getElementById) { statements using getElementById }} Although it is a simple if statement, it ensures that the "old" browsers do not cause problems with my scripting code, so that the script has good backwards compatibility.Browser sniffing technology: addresses backward compatibility issues by extracting information from a browser vendor.Performance considerations: Determining the optimal performance of script execution1. Minimize access to the DOM and minimize markup2. M

The Style property is an object and can only return inline styles.When you need to reference a CSS property with a minus sign in the middle, the DOM asks for the hump naming method, that is, the CSS property font-family becomes the DOM attribute fontFamliy:element.style.fontFamilyRegardless of the number of hyphens in the CSS style attribute's name, the DOM is all represented by the Hump naming method, which is the CSS property backg-color corresponding to the DOM attribute backgroundcolor.CSS3

of the move.The behavior is first judged, if the element ID cannot be read then return FALSE. Otherwise, the initial position of the element is read. The difference between the judgment and the final position.Then use the SetTimeout function, which is a function that allows a function to start executing after a certain period of time.Finally, use addloadevent to ensure that this function segment is executed after the entire HTML load.Can be used in pictures, text and other elements, the idea is

content "Hello world" is created.InsertBefore: Insert a new element in front of an existing element, when calling this method, you must know three things: 1, new element: The element you want to insert (newelement) 2, Target element: Before which element (targetelement) you want to insert this new element 3, parent element: The parent element of the target element (parentelement) Syntax: Patentelement.insertbefore (newelement,targetelement) We don't have to figure out what the parent element is

to the value of the attribute node. After making changes to the document through SetAttribute, you will still see the value of the property before the change through the browser's view source option to view the document's source code, that is, the changes made by setattribute are not reflected in the source code of the document itself. This "duplicity" phenomenon stems from the DOM's working mode: loading the static content of the document, and then dynamically refreshing, dynamic refresh does

First, object detection (whether the JS method is supported): only if the method is supported to invokeif (!getelementbyid | | getElementsByTagName) { returnfalse;}Second, performance test filter1. Minimize access to the DOM and minimize markup: Take the following code as an exampleif (document.getElementsByTagName ("a"). Length > 0) { var aliks = document.getElementsByTagName ("a"); for (var i = 0; i ) { }}This code is to find the Optimized code:var aliks = document.getElementsByTa