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If
if (conditional expression 1) {conditional expression 1 is true when executing code}else if (conditional representation 2) {conditional expression 2 is true when code executed}else{previous condition is not compliant}
else if and else are optional
Switch
Switch (value) {Case value 1: Code snippet; break;case value 2: Code snippet; break;case value 3: Code snippet; Break;......default: code snippet;}
Concluding sentence:
The website is sending the book "JavaScript Advanced Program Design" to pass through the past do not miss, participate in the way, focus on this site and simple to seek network + forward micro-blog: http://weibo.com/1748018491/DoCtp6B8rThis site joint simple search Network # Search for miles # is being sent book "Advanced Programming of JavaScript," the third edition
replaced with a specific object, such as Book._definegetter_ (), 2 parameters, omitting the first argument beforeDefine multiple properties Object.defineproperties (), accept 2 object arguments, the first parameter is the object to add and modify the property, and the second corresponds to one by one of the first object added or modified by the Chinese herbAttributes of the Read attribute: Object.getownpropertydescriptor (); Accepts 2 parameters, the object where the property resides, and the n
() { 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
Book list (i) JavaScript from beginner to Proficient (second edition) 1, this book is suitable for beginners JavaScript students, because I have just entered the ranks of the web development, so it is a small white, choose this book as a primer, should be able to. 2, before reading this book, you may not know what is javascri
Brief introduction:The basic JavaScript Tutorial (8th Edition) introduces JavaScript and related CSS, DOM, Ajax, jquery and other technologies. Starting with the JavaScript Language Foundation, the book discusses images, frames, browser windows, forms, regular expressions, user events, and cookies, and adds two chapter
, the browser does not display anything in the Extension: Hack technologyDue to different browsers, the parsing of CSS is not the same, so it will result in the resulting page effect is not the same, not get the page effect we need. At this time, we need to write different CSS for different browsers, so that it can be compatible with different browsers, can also be in different browsers to get the desired page effect. The process of writing different CSS code for different browsers is called C
GetCookie () function that resolves the value of the Document.cookie property, stores the corresponding name/value pair in an object, and returns the object at the end of the function.Parsing Document.cookie Property values/** returns the value of Document.cookie as an object of name/value pairs * Assuming that the value of the stored cookie is encoded with the encodeurlcomponent () function */function GetCookie () { var cookie = {}; Initialize the last object to
syntax does not allow a variable name to contain spaces or punctuation (the dollar sign "$" exception)JavaScript variable names are allowed to contain letters, numbers, dollar signs, and underscores (but the first character is not allowed to be a number)Hump format naming:Remove Middle white space (underline), followed by each new word start with uppercase letters Script > var ="happy"; Script >Usually the hump format is the preferred format for
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
Seldom read, do not like to read, the main school is always sitting, not much qualitative, a book can be read two days, casually turn over, you can also throw in the corner for a few months not to move.The last time I met the JavaScript Advanced Programming (3rd edition), it felt really good, and many great gods were recommending this book, so they downloaded the electronic version of chapter Five. The day
tag. Can be used as a warehouse. Use Document.createdocumentfragment () to create a document fragment that inherits all the methods of node attr type element attribute in the DOM is represented by the attr type attribute: Name (attribute name), value (attribute value,As with the NodeValue value), specified (Boolean, whether specified in code) uses Document.createattribute () and passes in the attribute name to create a new attribute node The above is for individuals this period of time since th
March 2008, first version
The first version.
March 2012, Second Edition: More than 70 mistakes found after the revision and release of the first version, of which more than 50 are mainly word and typographical errors. Rebuild the plate to avoid the loss of the broken number caused by printing. The contents are refined to level 4 titles to fully display the content and structure of the book. Add this appendix to maintain multiple versions of this
can be a variable, or even an expression. The switch statement uses the strict equality operator when comparing values, so type conversions do not occur.
Any function can implement the return value at any time by the return statement followed by the value to be returned, and any code after the return statement will never be executed.
Strict mode has some limitations on functions:
The function cannot be named eval or arguments;The parameter cannot be named eval or arguments;Two name
This chapter mainly introduces some of the history of JavaScript:1.Javascript mainly consists of three parts: Ecmascript,dom,bom.ECMAScript: The mainstream browser is now fully supported.DOM: Maps the entire HTML page to a multi-tiered node structure. With the API provided by the DOM, developers can easily delete, add, replace, or modify nodes.BOM: Control browser window size, move, Ajax object, etc.Summary
: Network Disk DownloadContent IntroductionThe edition of version 5th has been revamped for Ajax and Web 2.0 technologies. Compared with the previous version, the content of the update is more, overall close to the entire length of 1/2, and this is one of the reasons why the book came to a belated. Specifically, the 5th edition is updated in the following sections: The first part of the chapter on functions
Doe // Script Error (2) All variables that do not have a direct assignment defined are automatically declared as having global scopefunction dosomething () { var Name= "Zhang San"; NewName= "John Doe"; // Zhang San // John Doe // Script ErrorThe variable blogname has a global scope, and AuthorName cannot be accessed outside the function.(3) All Window object properties have global scopeIn general, the built-in properties of the Window object have global scope, such as Window.name, Win
the array item, the position of the item in the array, the array object itselfL every (): Runs the given function for each item in the array, and returns True if the function returns true for each itemL filter (): An array of items that run the given function for each item in the array, returning the function that returns trueL ForEach (): Runs the given function for each item in the array, this method does not return a valueL map (): Each item in an array runs the given function, returning an
Study and work often through the guidance of the search engine into the blog park, the knowledge of the technical Daniel often sharply to solve the problem that has plagued me for a long time large and small. But has always been to read someone else's blog, he has not moved, until a blog said, from simple to complex to remember reading notes or knowledge summary is a good way to promote technological progress, feel very sensible, after the study of finishing more can remember firm, so recently d
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