JavaScript Language Basics 12

When using the IF statement, if you encounter many conditions, you should not continue to use the IF statement, JavaScript provides a more efficient alternative, that is the switch statement, we first look at the switch statement template:hello

JavaScript variable Scope!

Basic types and reference typesA primitive type value refers to a simple data segment, whereas a reference type value refers to an object that may consist of multiple valuesWhen you assign a value to a variable, the JavaScript parser first

JavaScript implementations of some common algorithms

In web development, JavaScript is important and algorithms are important. Here's a look at some of the common algorithms implemented under JavaScript, including dichotomy, string length, array de-weight, insert sort, select Sort, hill sort, quick

A detailed description of JavaScript string processing

First, create a string Create a string, wrap a set of strings in quotation marks, and assign them to a string variable.var Jsstr= "Hello,javascript string!";Second, string lookup method1. Character Method Charat (), charCodeAt (), fromCharCode ()(1)

JavaScript dom manipulation of the IFRAME

In IE6, IE7, we can use Document.frames[id].document to access the Document object in the IFrame Subwindow, but this is not in line with the standard of the writing, is also the unique method under IE, It is not available under Firefox, and Firefox

JavaScript basic Syntax &1

1. Identifiers and reserved wordsIdentifiers: Typically variable names, which can consist of numbers & letters &$& underscores; The first character cannot be a number;Reserved words: Typically a word that has a special meaning inside JavaScript, or

JavaScript modular Programming (II): AMD Spec Author: Ruan Yi Feng

Disclaimer: Web logs reproduced from NanyiThe first part of this series introduces the basic wording of the JavaScript module, and today describes how to use the module in a canonical manner.(next to the above)VII. Specification of modulesFirst

JavaScript for Sina Weibo mid and address translation

Sina Weibo each Weibo will have a mid, and each Weibo has a separate address, for example: http://www.weibo.com/2722086301/Bw3sxzwzpRule: The yellow part of the address is the user ID, the green part is the micro-bo identification string, after

About JavaScript Object-oriented and prototype notes

JavaScript is a special language, there is no class concept in ECMAScript, it differs from other object-oriented languages, and its objects differ from those in class-based languages, and strictly speaking, JavaScript objects are a set of values

Traverse all nodes in the JSON JavaScript object Tree

I want to traverse the JSON object tree, but why can't I find any library. It seems to be not difficult, but it feels like reinventing the wheel.There are many tutorials in XML that show how to traverse the XML DOM Tree: (Workaround 1:If you think

JavaScript scopes and scope chains

I. About block-level scopesWhen it comes to JavaScript's variable scope, it differs from the Class C language we normally use.For example, the following code in C #: static void Main (string[] args) { if (true) { int num = 10

Examples of undefined and null comparisons and function types in JavaScript

/*** Undefined==null Returns True* undefined = = = NULL returns FALSE* Undefined indicates that the variable is defined but not assigned* NULL indicates a reference to an empty object*/function typeExt.onready (function () {function Fun ()

Javascript Basics Common Objects Introduction

Array type (stacks && queues) 1) var arr = new Array (); The length in parentheses can be unspecified, because the length of the array in JS can be changed dynamically 2) Similar to the list container in Java, the length is variable (arr.length=num),

JavaScript variables, functions, and prototype chains

Definition | | Assign value1-Definition of functionFunctions are defined in two ways:"Defined" functions: function fn () {alert ("Yo, Yo!");}"Assignment" function: var fn = function () {alert ("Cut to make noise!") "); }@ When the page loads, the

The ambiguity of the JavaScript operator

Recently through a colleague's introduction and read a book called "JavaScript Language Essence and programming practice," a lot of details about JS, such as I would like to talk about the two of the semantics of the operator, then the question,

Detailed description of JavaScript events

JavaScript Event List commentary on JavaScript event listEvent Browser Support CommentaryGeneral event onclick IE3, N2 trigger this event when mouse clicksOnDblClick IE4, N4 triggers this event when the mouse double-clicksOnMouseDown IE4, N4

JavaScript Date Processing Library-datejs.js

Original: http://code.google.com/p/datejs/wiki/APIDocumentationjavascript Date processing Library-datejs.js Time of dayDate.today(); Compare two time sizes, return -1,0,1var today = Date.today (); var past = Date.today (). Add ( -6). Days (),

A few aspects that a JavaScript engineer must master (turn)

As a JavaScript engineer, when writing a tool library, in general, you need to provide the following modules.Core module: core.js$namespace Register Namespaces:$namespace (' Human.software.dom '); Window.human.software.dom$package multi-module

A JavaScript Web page that implements a countdown timer that calculates how much time is left in the year

function counter () {         var  date =   new  date ();            var  year =  date.getfullyear ();            var  date2  =  new  date (year,  12, 31, 23, 59, 59);    / * Convert into seconds * /         var

Use Var to define the precompiled effect of variables in JavaScript

First of all, the JavaScript syntax is very flexible, the price of flexibility is easy to lead to irregular coding and a variety of unexpected running results. ECMAScript 5 introduces the strict mode (strict mode), and in the future we'd better

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