JavaScript

A string that is known to be #####, now needs to replace the # of the even position with &.function Replacedemo () { var s = "1#2#3#4#5#"; var regex =/#/g; var index = 1; S=s.replace (regex,function() {index++; Return index%2?

JS in the function of the process is not just a simple local variable overrides global variables, and functions inside the declaration of the situation. Like what: JavaScript about local variables and global variables

The first thing to be clear is that the constructor in JavaScript does not need to have a return value, which is similar to Java. It can be considered that the most significant difference between a constructor and a normal function is that there is

The declaration of the JS function.The format of the declaring function is as follows:Function name (argument list) {//functions statement; return value;}See the specific function declaration.1. Common functions2. Functions with ParametersIt is

1. Context-specific snapshot technologyWhat is context (contexts)? is actually the JS application's operating environment, avoids the application modification mutual influence, for example a page JS modifies the built-in object method ToString,

1. document.write (""); Output statementThe comments in the 2.JS are//3. Traditional HTML Document order is: document->html-> (head,body)4. The DOM order in a browser window is: window-> (navigator,screen,history,location,document)5. Get the name

1 JavaScript variable scope 1.1 Function scope There is no block scope: The scope is not surrounded by {}, and its scope is determined by the function, so the curly brackets in the statement such as If/for are not separate scopes. As mentioned above,

In the simplest form, a "name/value pair" can be represented by a JSON such as the following:var jsonstring = ' {' firstName ': ' Brett '} ';If such a simple JSON string using the Eval function is not resolvable (tested in Chrome browser 37.0)var a =

The so-called associative array (associative array) refers to objects in JavaScript.Because a property in JavaScript is a key-value pair that can be accessed through obj[attr], it is similar to an array.There are many other types of data

This week ' s JavaScript News Read this issue on the Web | Issue Archive JavaScript Weekly Issue 184June 6, 2014

Some of the relevant values1, 0, ' 1 ', ' 0 ', true, false, ' true ', ' false ', Nan, ' Nan ', Undefined, ' undefined ', null, ' undefined ', ', [], {}true = = 1//truetrue = = ' 1 '//truetrue = = ' true '//false, except ' 1 ', true not equal to any

In order to solve the problem of the prototype, we need to create the object by combining construction methods and prototypes, define the properties in the constructor method, and define the method in the prototype . This effective aggregation of

Part1---------------------------------------------------------------------------------------------------------1. PrefaceThese two days looked at Uncle Tom's "in-depth understanding JS series" In the basic part, according to their actual situation,

Implementation and explanation of the sort algorithm in javascript (JS note) and javascript99js Bubble Sorting The principle of bubbling is to "float" the maximum or minimum element. Insert sorting, select sorting, fast sorting, and Bubble

Use JAVASCRIPT to implement static objects, static methods, and static attributes The object-oriented feature of Javascript language is very weak. When other object-oriented languages create a class, they only need to use the keyword static to

Compares various methods of JS array merging and their advantages and disadvantagesOriginal article: Combining JS ArraysOriginal Article Date:Translation Date:Translated by: TieThis article is a basic JavaScript skill. We will learn a variety of

Comparison between Function. prototype. apply () and Function. prototype. call () in javascriptThe apply () method can call a function or method while using a specified this value and a parameter array (or an array of classes. The call () method is

Disable the iframe pop-up window to overwrite the parent window. The iframe window The iframe function I want is not to control the parent page. If he wants to control it, which code can be added to the parent page to make it unmanageable?If iframe

Javascript implements code instances similar to asp data dictionary data types, js Data Types First declare an array:Copy codeThe Code is as follows:Var dictNew = new Array; Var key; Var value; For (var I = 0; I // Obtain the key-value pair to be

CSS Hacks in the browser and CSSHacks in the browser LZ note: the original author of this article is Paul Irish (Google's front-end development engineer). This article is part of the original article. 1: 2: /***** Selector Hacks ******/ 3