JavaScript

It's embarrassing to say that I've been doing it for eight years, but I've never learned to learn JavaScript from the basics, and I've been thinking about how much the connection with Java is.I'm really ashamed of myself. It's time to start today

----------------------------------------------1. Request dataThere are 5 commonly used techniques for requesting data from the server: Xmlhttprequest,dynamic script tag insertion (dynamic script tag insertion), Iframes,comet,multiparty XHR

Closures (closure) are a difficult and unique feature of the JavaScript language, and many advanced applications rely on closures.Here are some of my understanding of closures.Note: Some of the content is reference to the information on the Internet.

Document.body.clientWidth//Web page visible area widthDocument.body.clientHeight//Web page visible area heightDocument.body.offsetWidth//Web page visible area includes the width of the edgeDocument.body.offsetHeight//Web space area includes the

Assigning an initial value to a parameterThere is no overloaded concept in JavaScript, but the parameters of the functions in JavaScript are optional, and if a parameter is written less, it will be replaced by undefined. egfunction Add (A, b)

PrefaceToday, JavaScript has become the core of Web page editing. Especially in the past few years, the Internet has witnessed the emergence of a large number of JS libraries in the areas of spa development, graphics processing, and interaction.If

Thorough understanding of JavaScript prototype inheritanceBefore writing an article on the topic of JavaScript inheritance, this article as a reading note, analysis is not deep enough.This article attempts to further consider and strive for a

The topic is as follows: Please write out the following code 2 times alert output what results separately?My answer is: 1.undefined 2.undefined. Then leader let's think about the answer to the question. My analysis of the topic: 1. Declare a and

1 varA1 = Math.pow (2,3);//2 of 3 power2 varA2 = Math.Round (. 6);//Rounding3 varA3 = Math.Round (0.6);//rounding, self-testing complete decimal rounding4 vara4 = Math.ceil (. 6);//To seek the whole up5 varA5 = math.floor (. 6);//

Introduction to the use of the substring () method in JavaScript, javascriptsubstring This method returns a subset of a String object.Syntax string.substring(indexA, [indexB]) The following is the detailed information about the parameters: IndexA:

The usage of the charCodeAt () method in javasacripat, javacharcodeat This method returns a number indicating the Unicode value of the character at the given index. Unicode code points range: 0 to 1114111. The first 128 Unicode vertices are directly

Javascript + html5: canvas: The method for drawing the empty font text of a volume, This document describes how to use JavaScript + html5 to draw empty text in the canvas. Share it with you for your reference. The specific implementation method is

JavaScript converts a Date to a string using Date-Mask This example describes how JavaScript converts a Date to a string using Date-Mask. Share it with you for your reference. The specific implementation method is as follows: ? 1 2 3 4 5

How to draw a circular pattern using canvas using js + html5 This article describes how to use JavaScript + html5 to draw a circular canvas. Share it with you for your reference. The specific implementation method is as follows: ? 1 2

Js variable scope Problems During job interviews, we often encounter the following questions: Var a = "Hello"; function B () {alert (a); var a = "World"; alert (a) ;} B (); The correct running result is: undefined, world Why is this result?

DOM node-JS Summary DOM node-JS Summary Three types of nodes are available: attribute nodes, element nodes, and text nodes. HTML content:   Test Div SkewEnd JavaScript content:   (1) attribute nodes 1. parent node:   Window. onload = function ()

Use javascript to set, retrieve, and delete cookies. Use javascriptcookie. This example describes how to set, retrieve, and delete cookies in javascript. Share it with you for your reference. The specific implementation method is as follows: /** Set

Meteor node. js Note the following three methods:   var exec = Npm.require('child_process').exec;var fs =Npm.require('fs');     1. The original file is in the private directory, and the Meteor Assets are used to read the content, and the node. js

JQuery implements text expansion and contraction Effects There is only one small area on the webpage, but the descriptive text is very long. The following script displays the long text. When you click expand, the text is expanded, and the text is

Usage of the for Loop in JavaScript This article mainly introduces how to use the for Loop in JavaScript. It is the basic knowledge in JS learning. for more information, see As we can see, the while loop has different variants. This chapter