JavaScript

First look at the two function declarations:var square1 = function (x) {return x*x;}function Square2 (x) {return x*x;}The two seem different, and in most cases there is not much difference, but the first use sometimes error, such as:var r1=square1

Traditionally, string connections have been one of the lowest performing operations in JS.View Source print? 1 vartext="Hello"; 2 text+=" World!"; This operation was not optimized by

How do you write JavaScript to make it taller? How can you organize JavaScript to make it easier for others to see you at a glance? Do you expect others to read your code and say, "Can you write like this?" Here are some of the loading techniques

The language of JavaScript itself is built on a message mechanism, so it is easy to handle asynchronous callbacks and various events. This concept is different from the Common Programming language Foundation, so many people who have just touched

In JavaScript The equality operation includes "= =", "= = =" Congruent, the difference between the two, do not need the majority, this article we will tell how to determine whether two objects are equal? You might think that if two objects have the

First, we use a classic example to briefly explain the inheritance mechanism in ECMAScript.In geometry, there are essentially only two geometric shapes, the oval (which is circular) and the polygon (with a certain number of edges). A circle is a

this series as effective JavaScript 's reading notes. ECMAScript The standard does not provide for JavaScript of the Object The order in which attributes in the type are stored. but in the use For : in looping through the properties of an Object ,

(1), onclick: The user clicks the left mouse button, and when the user presses the ENTER key when the focus is on a button, the OnClick event occurs (2), OnDblClick: When the user double-clicks the left mouse button, the ondblclick event occurs (3)

Duck Type: A duck that walks like a duck, swims and is a quack. For Javascript Programmers, this sentence can be interpreted as "if an object can walk, swim, and rattle like a duck, it is considered a duck, even if it is not inherited from the

7.1 Arrays ①javascript arrays are used in many ways, and elements in an array do not have to be exactly the same type Two ways to construct a ② array: A. Constructors for arrays var arrayname=new array ()///empty array var arrayname=new array (4)////

constructors typically do not use the return keyword, they initialize a new object, and when the function body of the constructor finishes executing, it displays the return. In this case, the result of the constructor call expression is the value of

Recently done a project to use the callback function, so study the next summary of my understanding of JavaScript callback first from the callback literal translation "callback" can understand that this is a function called mechanismWhen we meet a

Window.document.onkeydown =Disablerefresh;functionDisablerefresh (evt) {evt= (evt)?evt:window.eventif(evt.keycode) {if(Evt.keycode = = 116){ //Do something}}}keycode8 =BackSpace Backspacekeycode9 =Tab Tabkeycode12 =Clearkeycode13 =Enterkeycode16

One. anonymous function 1. The definition of a function can be divided into three types1) Function Declaration methodfunctionDouble(x) {return2*x;}2) function constructor, the argument list and function body as strings, inconvenient, not recommended

href= "javascript:;" is to get rid of the default behavior of the A tag, which is the same as href= "javascript:void (0)""The following content is reproduced in the original link: http://www.cnblogs.com/xd502djj/archive/2010/11/10/1874107.html"Links

Summary of js cookie reading methods, and js cookie reading This example summarizes the methods for reading cookies from JavaScript. Share it with you for your reference. The specific implementation method is as follows: There are many methods to

Js uses cookies to refresh the unchanged tree menu and cookie tree You can set the cookie to save the status of the tree menu and re-read the cookie when loading the page to set the menu. The HTML structure of the menu: Level 1 menu Level 1

JQuery implements smooth scrolling between the links of the same page anchor. The front-end of web development has been using JQuery, and it is only possible that JQuery is much more powerful than I thought, or more powerful than I think, in

JS implementation list and multi-choice box selection with preview Animation 1. Function Preview 2html code 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 product scope: Level 1 Classification all

Introduction to the page Ajax method $. load function in jquery, jquery. load Load syntax $ (". Selector"). load ("url", function (responseText, statusText, xmlhttprequest )); When loading a page, if an error occurs, the corresponding prompt is