JavaScript

JavaScript Global ObjectsDefinition and usageThe eval () function computes a string and executes the JavaScript code in it.GrammarEval (String) Parameters Description String Necessary. The string to evaluate

The DOM2-level change (mutation) event gives a hint when a change is sent to a part of the DOM. A Change event is designed for XML or HTML DOM and is not specific to a language. The DOM2 level defines the following change events.

There are three ways to declare variables in javascript: VAR, let, and Const. The following is a description of JS in three ways to define the variable const, VAR, let the difference.variables defined by 1.const cannot be modified and must be

In some scenarios where accuracy is not as accurate as possible, we can directly Number.prototype.toFixed() implement the need to retain two decimal places.var num = 123.45678console.log(num.toFixed(2)) //123.46var num2 = 12console.log(num2.toFixed(2

1. The so-called Nan, the English full name is not a number, indicating that it is not a count. If any one number and Nan are manipulated, the return is NanWill pop up Nan. Note: The data type of Nan is also numberNan is not equal to any value,

Previous wordsIf something is like magic, it means seeing the dawning of new things, and any technology that is advanced enough is no different from magic.JavaScript, like Magic, is a vibrant, easy-to-use language and a language with many complex

Transfer from http://www.ruanyifeng.com/blog/2009/08/learning_javascript_closures.htmlClosures (closure) are a difficult and unique feature of the JavaScript language, and many advanced applications rely on closures.Here is my study note, which

JavaScript is typically divided into two types of conversions, implicitly coercion type conversions (implicit coercion) and explicit coercion of type conversions (explicit coercion).The source code of all the following codes can be viewed here .One,

Mission Purpose Continue the JavaScript experience based on the previous task Learn the If judgment syntax in JavaScript, for loop syntax Learning about array objects in JavaScript Learn how to read, manipulate, and dynamically

Besides attention to capitalization, what's the other wood?Switch Statement Switch (variable) {Case 1:if the variable and the value of 1 are the same, execute the code at that pointBreakCase 2:if the variable and the value of 2 are the same, execute

Javascript Basics1 talk about Javascript1.1 The historical source of Javascript94 Netscape developed the world's first browser. The birth of Sun 's java languageNetscape works with Sun . Java+script ===> JavaScript1.2 Specifications ? structure

JavaScript's performance in the browser can be considered the most important usability issue that developers have to face. This problem is complicated by the blocking features of JavaScript, that is, when JavaScript is running, other things cannot

In the process of programming with JavaScript, we often encounter the problem that we need to detect the type of a data or variable, so what methods do we provide in JavaScript? The online spread of code everywhere, but found that some of them are

JavaScript is a single-threaded in-depth analysisWhen the interview found that 99% of the children's shoes did not understand why JavaScript is single-threaded but it makes Ajax asynchronous send and callback requests, and settimeout also look like

A Simple Method for reading and writing json files by nodejs (mandatory), nodejsjson Nodejs reads json files Var fs = reauire ('fs'); var file = "d: \ 0. json "; var result = JSON. parse (fs. readFileSync (file); // operation object Nodejs writes a

Vue. directive custom commands Many tutorials focus on the concepts and syntaxes of custom commands. This document does not focus on syntax and concepts, but on usage. Custom commands are basically used to operate the DOM. Although the data-driven

Bootstrap's deployment usel works with dropload. js to implement sliding switching between images on mobile terminals, A slideshow can jump to the previous or next one by clicking the button. On the Mobile End, we often use sliding to achieve some

Based on the WebSocket communication Implementation of Node. js, node. jswebsocket Node dependency package There are many dependency packages for implementing Websocket in node. Both websocket and ws can be used. This article selects ws for

CSS knowledge points and css knowledge points CreateTime -- September 29, 2016 09:43:10Author: Marydon1. linear gradient of background color Background-color: linear-gradient (100deg, # FFF, #111);/* indicates the degree of deg from black to white */

Css3 class selector combines element selector and multi-class selector, css3 Selector The combination of css3 class selector element selector and multi class selector usage: Title View mE I am myself I am a text me or italic