JavaScript

var a=new Array ();If this definition: a[3]= "a"; Alert (A.length) 4 instead of 1,If defined, but not assigned, returns a undefined (alert (a[0))To create an array : Copy Code code as follows: arr = [];//Yes, an aerial bracket is

Overview HTTP protocol is a stateless protocol, the server side itself does not have the ability to identify clients, must use external mechanisms, such as session and cookies, to maintain a dialogue with a specific client. This is more or less

One, Element node Copy Code code as follows: Test element node, output node name, node type, node value var lielements=document.getelementsbytagname ("Li"); for (Var i=0;ialert (lielements[i].nodename); alert

ECMAScript can recognize two types of objects, one of which is called native object, which belongs to the language category, and is called host object, provided by the running environment, such as a Document object, Dom node, etc. Native objects is

Author: Moon Shadow Keep in mind: Functional programming is not programmed with functions!!! 23.4 Function-type programming 23.4.1 What is functional programming What is functional programming? If you ask so plainly, you will find that it is a very

1. How objects are created : (1) created by the new operator, followed by a constructor function name var object = new Object (); When a constructor calls directly, it usually does not return a value, it simply initializes the object passed in by

This example describes the use of push methods in JavaScript arrays. Share to everyone for your reference, specific as follows: Look at the following code: var o = { 1: ' A ' , 2: ' B ' , Length:2 ,

Copy Code code as follows: insert title here

Array is inherited from object. It has all the functions and properties of object. Here is the case of object:NEW: var object = new Object ();Add: object[strindex] = value; (Strindex to String)Delete: delete Object[strindex];Traversal: for (var

The property of an object in JavaScript has three properties:1.writable. Whether the property is writable.2.enumerable. Whether the property is enumerated when the For/in statement is used.3.configurable. Whether the property's properties can be

You need to wait for the right time to bind the actions and events of an element, and look at the following example: 1-1 click Me. If this is not waiting for the element to be loaded, an event is bound to Div#panel, and the

Objective In fact, like other programming languages, JavaScript also has a number of design patterns, such as single example mode, proxy mode, observer mode, etc., skilled use javascript design pattern can make our code logic clearer, and easier to

Dynamic JavaScript JavaScript code is often combined dynamically through the server-side band and name. In the process of this combination, user-related information is saved to the JavaScript code. When the JavaScript script is routed to the

How to compile the guest book program? Guest Book program is not difficult, there are many options can be implemented, such as CGI programs and so on. This article describes how to use JavaScript to prepare a guest book program, the following is a

Before reading this article, please take a look at the first article JavaScript drag-and-drop series article 1 offsetparent attribute, because gradual is a good habit, worth advocating. OK, let's see what we have today. Let's first take a look at

In JavaScript, an object is defined as "a collection of unordered attributes, whose properties can contain basic values, objects, or functions." In layman's terms, we can interpret an object as a set of name-value pairs, where the value can be data

1. Don't make any assumptions (JavaScript is an unreliable helper) One of the most important features of a potentially unobtrusive JavaScript is that you want to stop any assumption: * Don't assume that JavaScript is available, you'd better think

Global functions Date Static methods for the Date class Date.parse Date.utc Method of establishing Date object New Date () New Date (number of milliseconds) New Date (Standard Time format string) New Date (year, month, day, time, minute, second,

Exceptions in JavaScript can be used with a try ... Catch.. Finally statement to process, or you can manually throw an exception. 1. Use Try ... Catch.. Finally statement to handle exceptions JS code in the execution of an exception, you will

Ingenious 1: function Functions are a rare talent in JavaScript code. ♥ It can decorating code snippets and encapsulate relatively independent functionality. ♥ It can also implement classes and inject oop ideas. jquery is a function, you can also