JavaScript

Native JS provides the typeof operator to judge the type, but it is not a problem when judging the basic type, but it is somewhat unsatisfactory when judging the complex type.What are the basic types?The argument is that null and function are not

JavaScript does not have the concept of class, but JavaScript has its own prototype mechanism, we can use the prototype mechanism (Prototype,constructor) to pseudo a class out, commonly known as "pseudo-class."When a new function object is created,

How to use 1. Create an expression   Methods for creating regular expression classes in javascript: var regex = new RegExp ("\\d{5}") or 2.var regex =/\d{5}/(Recommended) /Expression/is the syntax provided specifically for simplifying regular

Usually our website will load some JS code, statistics ah, Google ads Ah, Baidu League ah, Ali mom Advertising code Ah,A bunch, and finally make the page load slowly, very slow.Workaround: Change the way JS is included to allow JavaScript to load

1. Introduction to JavaScriptJavaScript was born in 1995 and developed by Netscape company Brandon Aichi, which mainly consists of three parts:(1). ECMAScript, defined by ECMA-262, improves core language functionality(2). Document Object Model (DOM),

The sixth chapter case study: Picture Library improvement EditionThis chapter will improve the image library according to the content mentioned in chapter fifth.First check whether the DOM method is supported by the browserif

1 DOCTYPE HTML> 2 HTML> 3 Head> 4 MetaCharSet= "gb2312"> 5 Metaname= "Author"content= "http://www.yuanquanshuqian.com/" /> 6 title>SOURCE Bookmarkstitle> 7 8 Script>9 //Delete Row (obj represents connection object)Ten functiondeleterow (obj)

. Map (FN) method1 var a=[2, 4, 6];2 a.map (function (d, I, arr) {3 return {x:i, y:d*i, z:arr};4});Output Result:1 [{x:0, y:0, Z:[2, 4, 6]}, 2 {x:1, Y:4, Z:[2, 4, 6]}, 3 {x:2, Y:12, Z:[2, 4, 6]}The d in the callback function is the value of the

JS + CSS: How to automatically change the switching direction of image slides This article mainly introduces how to automatically change the switching direction of javascript + CSS image slides. The example shows how to use javascript to operate on

JS: how to achieve the non-stop flashing effect of the DIV layer corresponding to the clicked text This article mainly introduces the method for JS to achieve the non-stop flashing effect of the DIV layer corresponding to click Text. The example

Event object attribute Summary In Jquery This article mainly introduces the summary of the operation methods of Event object attributes in Jquery, which is very detailed. It is a very good article and we recommend it to you here.    The JS Event

How to activate the current page navigation using javascript. This example describes how to activate the current page navigation using javascript. Share it with you for your reference. The details are as follows: Html section (reference navigation,

Combobox in jQuery + easyui implements drop-down box Effects This article mainly introduces several methods for implementing the special effects of the drop-down box in combobox in jQuery + easyui. It is very simple and practical. For more

JS: How to customize the background color on the page at any time. js background color This example describes how to customize the background color on the page in JavaScript. Share it with you for your reference. The specific implementation method

Bs + json Parsing #-*-Coding = UTF-8-*-import urllib2from BeautifulSoup import BeautifulSoup as bs3import jsonimport codecs # character detection, used to detect the actual encoding format import chardet # save content to filedef save_to_file

How to Use JS to detect mouse color on a webpage scroll bar This article mainly introduces how to use javascript to detect mouse color on a webpage scroll bar. The example analyzes javascript's operation skills for mouse events, which has some

Js drag-and-drop-and-zoom-in layer drag-and-drop effects implementation method, js drag-and-drop This article describes how to implement the layer-based drag-and-drop special effect of JavaScript. Share it with you for your reference. The specific

JS adds performance analysis to the array, and js array adds Performance Compared the performance between four methods that can add items to an array: Add With Indexer Copy codeThe Code is as follows:Console. time ("index ");Var a = [];For (var I = 0

JavaScript to obtain the selected text in the text box, javascript text box This example describes how to use JavaScript to obtain the selected text in a text box. Share it with you for your reference. The specific analysis is as follows: The code

JavaScript learning-generating QR codes and javascript -- There are some cpu-consuming calculations that can be fully calculated on the client, such as generating a QR code. Qrcode is actually calculated, and then jquery is used to render and draw