javascript definitive guide 6th edition

: The instance method of JS must use the This keyword, and the class's methods usually do not use the This keyword, they refer to its parameter operation;The P222-based inheritance mechanism in the extended p223js of class 9.4 is dynamic: Objects inherit properties from other prototypes, and if the properties of the prototype change after the object is created, it also affects all instance objects that inherit the prototype, and we can augment the JS class by adding a new method to the prototype

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

PDF version, English version 158th page,var IsArray = Function.isarray | | Function (o) {return typeof o = = = = "Object" object.prototype.tostring.call (o) = = = "[Object Array]";}; return typeof o = = = "Object" object.prototype.tostring.call (o) = = = "[Object Array]";};Array.isarray is a function provided by ES5, this example is to implement this function in ES3, first, if the browser supports Array.isarray, it is assigned to IsArray, otherwise the subsequent function is assigned to IsArray.

Brief introductionSince 1996, JavaScript's: Authoritative guide has been defined for JavaScript Bible programmers, Programmer's guides and a comprehensive reference to the core language and Web browser of the client JavaScript API. The 6th edition includes HTML5 and ECMAScri

: Indicates whether the property can be deleted or modified.First, create the object1. Direct volume of objects var empty={}; // var point={x:0,y:0}; var point2={x:point.x,y=point.y}; var book={ "main title": "JavaScript", // "Sub-tit": "The Definitive Guide", // for: ' All audiences ', // property named reserved word , you must us

the function that declares it and in any function nested within the body of the function. So in a function body, no matter where the variable is declared or even before it is declared, it can be used (without prompting for an error), but only after it has been declared and assigned, can it use the value assigned to it correctly. Therefore, in general, a good habit is to put the local variables to be declared in the function body at the top of the function body. var scope= "Global"; function f (

implement asynchronous i/o297Part Two client JavaScriptChapter 13th JavaScript309 in Web browsers13.1 Client JavaScript30913.2 Embedding JavaScript313 in HTML13.3 JavaScript Program execution 31913.4 Compatibility and interoperability 32613.5 Accessibility 33313.6 Security 33413.7 Client Framework 33914th. Window Object 34114.1 Timer 34214.2 Browser positioning and navigation 34314.3 Browsing History 34514.4 Browser and screen information 34614.5 dia

removed from the array, and if the second argument is omitted, all elements are deleted from the starting point to the end of the array. Splice () returns an array of deleted elements that return an empty array if no elements are deleted.var a=[1,2,3,4,5,6,7,8];a.splice (4); // return [5,6,7,8],a to [1,2,3,4] // return [2,3],a to [1,4] // return [4],a to [1]Splice () The first two parameters specify the array elements that need to be deleted, followed by any parameters that specify the eleme

A function is a special object;Object: A collection of properties (name-value pairs);The function is used to initialize (with the new operator) a newly created object is called a constructor.The object is called as a method when the property is a function.Within a function body, a local variable takes precedence over a global variable of the same name.code example:varscope = "global"; // Declare a global variablefunctionCheckscope () {varScope = "local";//life a local variable with the same nam

do some more type checking if(t!== "Object" t!== "function")ThrowTypeError (); functionF () {};//Define a dummy constructor function.F.prototype = p;//Set its prototype property to P. return Newf ();//Use f () to create an "heir" of P.} 3. Query and settings for attributes1. Object as an associative arrayJavaScript objects are associative arrays, the difference between point access and parenthesis access2. Inheritance3. Property Access Errorvar len = Book book.subtitle book.subti

not parsed correctly when the semicolon is missing.Generally speaking, if a statement starts with a "(", "[", "/", "+" or "-", it is most likely to be parsed together with the previous statement.Some programmers prefer to keep a semicolon in front of the statement so that even if the previous statement is modified and the semicolon is mistakenly deleted, the current statement will parse correctly. But there are two exceptions.The first exception is that there can be no line breaks between retur

I. Object-oriented technology in JavaScript (solving how to use the fatigue in JS programming)1. Examples of collection classesThe collection represents a non-repeating unordered collection. Two basic methods: A. Add to Collection B. Whether in the collection.　　　　Reference: p218 set.js2. Enumeration examplesEnumeration represents a limited set of values.　　　　Examples of PokerTwo. Standard conversion method1. toString (); Tolocalstring ();2. ValueOf ();

1. Method borrowing is "inheritance", and the prototype method in one class is used in another class. p227 Generic Object2. Private state:"The variable is closed in an anonymous function to simulate the private variables", these "variables" can only be accessed by the instance method of the class; 3. Construct refactoring:4. Factory method5. Subclass: "Method Chain", "constructor chain", "combination"6.201508110842_ "JavaScript authoritative

I. Classes and modules1. The implementation of the class is based on the prototype inheritance mechanism.Two. Classes and prototypesThree. Classes and constructors1. The constructor is used to initialize the newly created object.2. Use new, so the constructor simply initializes the object state.3. Building a constructor is defining the class, so the first letter is capitalized .4.Four. Identification of constructors and classesFive. Constrctor Properties1. The value of the constructor property i

JavaScript authoritative guide version 4th is a Javascript tutorial book with good sales and reputation. Because it is a Java rhinoceros on its cover, therefore, this book has another loud nickname called "Rhino book". If you are a Javascript programmer or want to learn javascript