JavaScript

JavaScript is a global programming language that can be used for web development, mobile application development (PHONEGAP, Appcelerator), server-side development (Node.js and Wakanda), and so on. JavaScript is still the first language that many

The role of Try...catch is to test errors in your code. Instance Try...catch statement How to write a Try...catch declaration. Try...catch declaration with a confirmation box Another example of writing a try...catch statement. JavaScript-Catch Error

Declare first: Each object in JavaScript has a constructor property and a prototype attribute. Constructor points to an object's constructor, prototype a prototype object that uses the object instance created with the constructor. function

1. The object is suitable for collecting and managing data, so it is easy to form a tree-shaped structure. JavaScript includes a prototype chain attribute that allows an object to inherit the properties of another object. Using it correctly can

JS Self-band function Concat Combines the text of two or more characters to return a new string. var a = "Hello"; var B = ", World"; var C = A.concat (b); alert (c); c = "Hello,world" IndexOf Returns the index (search from left to

Copy Code code as follows: function Checkmobile () { var smobile = Document.mobileform.mobile.value if (!) ( /^1[3|4|5|8][0-9]\d{4,8}$/.test (Smobile))) { Alert ("Not a full 11-digit cell phone number or the correct number of the top

Roledeclaring a function, such as declaring a variable.Grammar　 var c = 1; Omit Varin JavaScript, if you omit the var keyword and assign it directly, the variable is a global variable, even if it is defined in a function.

Second, enhance the navigation function 1. Links in drop-down menu (links in Select menu) Q: How do I implement a link to a different page in the Drop-down menu? a: To create a drop-down menu as shown:Select a pageJavaScript

A Undefined type Only one value undefined In the following three cases typeof return type is undefined 1. When the variable is not initialized 2. When the variable is undefined 3. When the function does not have an explicit return value (the

Today is a brief introduction to the JavaScript dialog box and the status bar. JavaScript and Dialog boxes: Three kinds of dialog box diagram:In the client browser, three common window methods are used to pop up simple dialog boxes, which are

SetTimeout () The setTimeout definition of MDN is: Calls a function or executes a code fragment after the specified delay time. Grammar The syntax for settimeout is very simple, the first parameter is a callback function, and the second

In JavaScript, creating an array can use the new array, and the following syntax is correct: Arrayobj = new Array () creates an array. Arrayobj = new Array ([size]) creates an array and specifies the length, not the upper limit, but the

In my opinion, the warning box is only used when the browser does not support other ways to display error messages. The Consortium recommends that we display an error message near the form item. This is a good idea, so we only use the warning dialog

In writing work-in-progress JavaScript book, I spent a considerable amount of time on the JavaScript inheritance system, and studied various scenarios for simulating classical class inheritance in the process. In these technical projects, I most

One of the advantages of JavaScript is how it handles asynchronous code. The asynchronous code is put into an event queue until all other code is executed, without blocking the thread. However, it may be difficult for beginners to write asynchronous

This method returns a string representing the specified Date object.Grammar Date.tostring () The following are the details of the parameters: NA return value: Returns a string representing the specified Date objectExample:

These days in doing a drag-and-drop element of the additional function, is to align to the grid, is actually to determine the initial position of good elements, and then drag elements, each move a fixed distance. Allow elements to be aligned within

3.1 Basic data types 1. String type: Consists of Unicode characters, numbers, punctuation marks, no char character type in JavaScript, even if only one character, must be used 2 digit (number): does not distinguish between integral and

First, the preface In the past, JavaScript was used to do simple web effects, such as form validation, floating ads, and so on, so JavaScript didn't get much attention at the time. Since the start of Ajax, people have found that using JavaScript

From:http://www.nirvanastudio.org/javascript/improve-javascript-performance.html Author: shiningray @ Nirvana Studio With the development of the network and the speed of the machine, more and more websites use the rich client technology. Now Ajax