JavaScript

Both typeof and instanceof in JavaScript can be used to determine whether a variable is empty or what data type it is. But there is a difference between them:typeofTypeOf is a unary operation that can be any type before it is placed in an

1. Data type: string,number,boolean,object,null,undefined2, abstract equality: x==yA, both data types are the same: typeof x = = typeof yA, string:x is exactly the same as the character of the Y position, returns True, otherwise false.b, the value

Town Field Poem:The Pure Heart sentiment wisdom language, does not have the world name and the benefit. Learn water under the hundred rivers, give up arrogant slow meaning.Learn to have a small return to feed root, willing to cast a conscience blog.

Town Field Poem:The Pure Heart sentiment wisdom language, does not have the world name and the benefit. Learn water under the hundred rivers, give up arrogant slow meaning.Learn to have a small return to feed root, willing to cast a conscience blog.

Width of the visible area of the Web page: document.body.clientWidthHeight of the visible area of the Web page: document.body.clientHeightWidth of the visible area of the page: Document.body.offsetWidth (including the width of the edge)Height of the

Idea: Convert two IP to a number to compare, the small one slowly add one, until become the big that IP converted number, this one of the number is converted to IP address that is the IP segment all the IP.1 //IP to Digital2 functionip2int (IP)3 {4

JavaScript's application environment is mainly the host environment (host environment) and the run-time environment composition. Where the hosting environment refers to the shell (shell) and web browser, and the runtime environment is built by the

In all object-oriented programming, inheritance is an important topic. In general, when designing classes, we want to reduce repetitive code and try to weaken the coupling between objects (allowing one class to inherit another can lead to strong

Reference:1, http://www.w3school.com.cn/tags/canvas_filltext.asp2. Generate random Number: http://www.cnblogs.com/banbu/archive/2012/07/25/2607880.html：Ideas:1. Create a canvas. (Background is black)2, Draw 1 "stars", try to become N.3. Put the

Transferred from:http://blog.sina.com.cn/s/blog_4ed32a400100tcr3.html The implementation functions are as follows function Getbrowser (n) { var ua = navigator.userAgent.toLowerCase (), S name = ' ', ver = 0; Probe browser (s =

Design principles (7 types): There are so many principles that guide us in the design and development of our programs because there is an unknown change in our program. In order to embrace this unknown change at the lowest cost, our predecessors

ObjectiveThis problem actually puzzled me for a long time, but in the actual use always muddle through, do not want to go deep. Because of this attitude, in the process of learning Javascript, the level has been out of half a bucket of water state,

All data types:Basic data type:UndefinedNumberBooleanNullStringComplex data types:Object①undefined:>>> declared but uninitialized variable: typeof-undefinedAler-UndefinedNon-declared variable: typeof-undefinedAlert-Error②null:>>>typeof a variable

The first and second parts of this series introduce JavaScript module prototypes and theoretical concepts, and today we show you how to use them in combat.I am using a very popular library require.js.First, why use Require.js?At the earliest, all

Town Field Poem:The Pure Heart sentiment wisdom language, does not have the world name and the benefit. Learn water under the hundred rivers, give up arrogant slow meaning.Learn to have a small return to feed root, willing to cast a conscience blog.

Original: JavaScript Best Practices for Beginners(note: read the original time did not pay attention to the publication date, think good translation, translation to JSON.parse that section think a bit incorrect road to find is published in 2009

CSS3 Transform, Transition, and Animation attribute summary, css3transition Three attributes related to deformation and animation in CSS3: Transform Browser support: Internet Explorer 10, Firefox, and Opera support the transform attribute. Internet

JavaScript implements front-end paging control and javascript front-end Paging Currently, the web focuses on user experience and interactivity. ajax data submission methods have become popular for a long time. It can partially refresh data without

JS-SDK choose mobile phone photo upload function, js-sdk select photo upload The project needs to select the photo to upload. Because the webpage runs in the browser, the js-sdk provides the photo selection function for project development. Web

Bootstrap progress bar and AJAX backend data transmission combined with instance details, bootstrapajax Many times, when we execute a URL request on the page, there is a waiting time. For direct page Jump, the browser will display the buffer