professional javascript for web developers 3rd edition

(Nullval));//nan Console.info (parseint (intval));//1 Console.info (parseint (floatval));//1 Console.info (parseint (Strval));//nan Console.info (parseint (empty));//nan Console.info (parsefloat (Trueval));//nan Console.info (parsefloat (Falseval));//nan Console.info (parsefloat (undef));//nan Console.info (parsefloat (Nullval));//nan Console.info (parsefloat (intval));//1 Console.info (parsefloat (floatval));//1 Console.info (parsefloat (Strval));//nan Console.info (parsefloat (e

Anchor objectsFrom ObjectArea ObjectImage ObjectLayer ObjectStyle objectDate ObjectMath ObjectString ObjectArray ObjectFunction objectObject objectsBoolean ObjectNumber ObjectOtherPublic properties and methodsinline function (top-level function)JavaScript AppendixAppendixColor List 1: Color of names defined in html4.01About web-safe colorsColor List 2:web Safety

() {Return age + Run ();}};}();The above example of a direct return object can also be written like this:var box = function () {var age = 100;Function Run () {Return ' running ... ';}var obj = {// Create literal objectGo:function () {Return age + Run ();}};Return obj; return This object}();The literal object declaration, in fact, can be regarded as a singleton pattern in the design pattern, so-called singleton mode, which is always an instance of preserving the Object.Enhanced module mode, whic

constructor. Prototype inheritance This method does not have a strict constructor, and the prototype allows you to create a new object based on an existing object without having to create a custom type.ECMAScript normalized the stereotype inheritance by adding the Object.create () method. Disadvantage: Properties that contain reference type values will always share the corresponding values, just as you would with a prototype pattern. Parasitic inhe

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

1.script element Properties (6): ①async (Asynchronous script), valid only for external scripts②defer (deferred script), valid only for external scripts③CHARSET,SRC (cross-domain), type,language2. Use external JS files whenever possible, because the browser caches all external JS files according to the settings. That is, if you have 2 pages that use the same file, you only need to download the file once3.①js scripts are generally placed in front of The ②async property, which represents the curren

One1. Get formvar form = Document.queryselector (' #formId '); var form = document.forms["FormName"];2.button:submit commits and Form.submit () submissions in JavaScript code the subtle differences3. Two ways of repeating a formDisable the Submit button after the first time the form is submitted, or cancel subsequent form submission actions in the onsubmit handler (how do I cancel the doubt?). ）。JavaScript

method is actually a property, Just the value type of the attribute is a function, we also call it a method: Category Properties/Methods Description Property Constructor Point to the function used to create the current object Method hasOwnProperty (PropertyName) Checks whether the given property is in the current object instance propertyIsEnumerable (PropertyName) Checks whether a given property can be enumerated by

1. I am a year earlier than JSThe 2.web browser is one of the hosting environments implemented by the ECMAScript.Other hosting environments that implement ECMAScript include node and Adobe Flash3.ECMAScript Main Provisions JS components: syntax, keywords and reserved words;variables, data types, operators, statements, types, objects;4.dom maps the entire page into a multi-node structure. Dom independent of PlatformJavaScript Advanced Programming (

2017-05-10JS IntroductionInvented by a man named "Not hard to be". The popularity of JS is due to the relationship between Ajax.JS is divided into three parts: Core: ECMAScript Document Object Model: DOM Browser Object Model: BOM Core: ECMAScriptHe has nothing to do with the browser, just the syntax, the type, the keywords or something.Document Object Model: DOMDom is to think of HTML as a tree structure so that you can manipulate them through the API.Html:html> head> t

value (or pointer), the reference point to the object is not involved in replication, That means the last two reference variables point to the same object5. Each execution environment has a variable object associated with it, and all variables and functions defined in the environment are stored in the object. There are many kinds of execution environment, such as global environment, function environment, with environment, and so on, the variable objects of these environments form the scope chai

From last year, because it is too long, there is always no way to read it, plus it and the second version of the majority of the same, read more interested in a little bit.Compared with the second version, its biggest change is to add a lot of HTML5 content, such as: Something new Object objects, data properties, accessor properties and some corresponding methods, such as its comparison and summary of common cross-domain methods: POSTMESSAGE,IE8 XDR, upgraded XHR, JSONP cross-domain principle, o

Website access analysis Web-Ia v7.1 Professional Edition Software size: 3895 KBSoftware language: Simplified ChineseSoftware type: domestic software/shared version/Network MonitoringApplication Platform: Win9x/NT/2000/XP/2003Launch: http://www.web-ia.cn/ Website access analysis Web-IA is one of the fastest and most p

()-start); }; Test (10);//55,2,55,2 Test (20);//6765,1,6765,7 Test (30);//832040,2,832040,643 As you can see, the greater the N value, the more obvious the advantage of using caching calculations. As an exercise, you can try to modify the function of calculating the factorial yourself. (3) Mimic block-level scopes In ECMAScript, there are statement blocks, but there are no corresponding block-level scopes, but we can use closures to mimic block-level scopes, in general format:

In the global fashion of mobile devices, more and more companies are working to build a Web site or application that is optimized on the mobile side to publish and sell their products. And this boom in mobile development is inseparable from JavaScript. With the rapid development of the Internet, mobile developers need to constantly broaden their expertise. In add

At present, in software development, unit testing is increasingly valued by developers. It can improve the efficiency of software development and ensure the quality of development. In the past, unit tests were often used in server development. However, with the gradual division of work in the Web programming field, related unit tests can also be carried out in the front-end

The JavaScript practical skills that Web developers must collect for your reference are as follows 1. Will completely screen the right mouse button oncontextmenu= "Window.event.returnvalue=false" 2. Deselect, prevent replication 3.JS not allowed to paste Onpaste= "return False" 4. js to prevent replication Oncopy= ' return false; ' oncut= ' return fals

Ocument.head.appendChild (style);// Build and return a single functionreturn function (rule) {style.sheet.insertRule (rule, style.sheet.cssRules.length);};} ) ();/Then call as a Functionsheet (". stats {position:relative; top:0px} ");These practices are very efficient, and in some scenarios, such as using AJAX to load a new piece of HTML, you do not need to manipulate the newly loaded HTML content. 　 determine if a page element has a property and style Matchesselectorfunction Matchesselector (e

, you should not focus on the submit button. Instead, the commit is activated directly.So I made a change to the above code, that is, to determine the "source" of the event, whether it is a submit button, the code is as follows:Determine if it is a button because there will be type= "button" on the HTMLDetermine if it is a submit, because there will be type= "submit" on the HTMLDetermine if reset is the result of the "reset" on the HTML that should be executedThe decision is null, because the "4

HTML, CSS, JavaScript Web authoring starts from the basics, starting with mastery, such as basic HTML tags, text and paragraph marks, table markers, Hyperlink tags ... At the same time, introduced the popular web standards and CSS Web page layout examples, as well as the language-based