Sparse arrays and dense arrays in JavaScript [translation]_javascript techniques

1. Sparse arraysCreating a sparse array of specified lengths is simple: Copy Code code as follows: > var a = new Array (3); > A [ , , ] > A.length 3 > A[0] Undefined When you traverse it, you will find that it

JavaScript reference pointer use introduction _javascript tips

Please try to complete the following cloze: Copy Code code as follows: /* Create a queue with head head0, tail for tail0 * * function Intlist (head0, tail0) { This.head = Head0 | | 0; This.tail = Tail0 | | Null } /* Returns a

How JavaScript is used in multiple browsers for loops _javascript tips

First, the preface The JavaScript language has subtle differences under different browsers, but unlike DOM operations, it now lists one of the "for loops" differences and explains how to effectively resolve the differences. Second, the problem

Jquery+javascript Write Nationality Control _jquery

have been suffering from the lack of good nationality control can be used, so the time to write a nationality control, now share to everyone. Main function and interface introduction The nationality control mainly supports the Chinese and English

The _javascript techniques of scope chain and closure in JavaScript

Scope Global scope Local scope Scope chain Execution context Active Object Closed Bag Closure optimization There is a concept in JavaScript that has not been learned before--closures. What is closure? A closed package from a superficial

JavaScript performance tuning _javascript techniques for Web performance optimization

JavaScript is a relatively complete front-end development language, in today's web development applications are very wide, especially for Web 2.0 applications. As Web 2.0 becomes more and more popular today, we will find that there will be a lot of

JavaScript Jscroll simulate HTML element scroll bar _javascript Tips

Mainstream browsers default to the HTML elements provided by the scroll bar is not beautiful, and the front-end developers want to their CSS through the unified style of beautification is also not achievable. For example, IE can be achieved by the

JavaScript group piece native table Sort table script (compatible with IE Firefox opera Chrome) _javascript tips

First create an HTML page for sort.html and copy the following content into it Copy Code code as follows: Untitled Document ID|- name|- 1 Happy 3 Dinner 5 Open ID|-

Highcharts very useful JavaScript Statistical diagram Demo sample _javascript Tips

Highcharts Official website: http://www.highcharts.com Highcharts Official Website Example: http://www.highcharts.com/demo/ Highcharts official website Document: Http://www.highcharts.com/documentation/how-to-use Official website example gives a

Using javascript: A workaround for converting other type values to Boolean type values _javascript tips

1. convert using a Boolean object Copy Code code as follows: var num123 = 123, str = ' abc ', o = {name: ' Test '}, NUM0 = 0; num123 = Boolean (num123); True NUM0 = Boolean (NUM0); False str = Boolean (str); True o = Boolean (o); True

A brief analysis of the different performance of JavaScript in IE and Firefox _javascript skills

1.document.formname.item ("ItemName") problem Note: Under IE, you can use Document.formName.item ("ItemName") or document.formname.elements["elementname"]; Firefox, you can only use the document.formname.elements["ElementName"]. Workaround: Unify

JavaScript code Reuse Pattern Example Analysis _javascript skill

Any programming uses code reuse, otherwise every time you develop a new program or write a new feature, you need to write new words, that's a good break, but the code reuse is also bad, the next two articles we will discuss the code reuse, the first

valueof function and ToString method in JavaScript to understand _javascript skills

The ValueOf function method in JavaScript is to return the original value of the specified object. How to use: Object.valueof () object is a required option parameter is any intrinsic JScript object. Each JavaScript intrinsic object has a different

15 JavaScript Best Practices Summary _javascript Tips

This document collates most of the accepted, or less controversial, JavaScript good writing specifications (best Practice). Some of the obvious common sense is no longer discussed (for example, to use objects to support identifying judgments, rather

Using JavaScript to compute the number of bytes used to store strings under UTF-8 _javascript tips

Lately it's been tangled up with JavaScript. A problem with this is that the character set of the database is UTF-8, and you want to use JavaScript on the page to verify that the text you enter uses UTF-8 storage to occupy the byte length. The

Whether there is a property judgment method in JavaScript detection object summary _javascript Tips

Detection of the existence of attributes in an object can be judged by several methods. 1. Use in keywordThis method can be used to determine whether an object's own properties and inherited properties exist. Copy Code code as follows:

JavaScript implements drag layer effect code (compliant and compliant Ie,chrome,firefox) _javascript tips

Instance code see: Copy Code code as follows: 1 2 3 4 5 6 Effect: 12 3 4 5 6 [Ctrl + A All SELECT Note: If the need to introduce external JS need to refresh to perform] Instance

_javascript techniques for writing JavaScript to create objects

What is the objectAn object is a collection of unordered attributes from a JavaScript definition, and its properties can contain basic values, objects, or functions. That is, an object is a set of properties that do not have a specific order, and

In JavaScript, whether a variable is an array or an object (array or object) _javascript tips

How can I tell if a JavaScript variable is an array or a obiect? Answer: 1, if you just use typeof to check the variable, whether it is array or object, will return to ' objec '. One possible answer to this problem is to check that the variable is

JavaScript module mode programming deep analysis _javascript skills

Basic knowledge First of all we need to know about module mode (2007 by Yui's Ericmiraglia in the blog), if you are familiar with Module mode, you can skip this section, directly read "Advanced mode." anonymous function closures Anonymous

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