javascript definitive guide

I gather a lot of questions about the JS Foundation, and share with you the success of the interviewWhat are the Q1,javascript data types?Don't underestimate the problem oh, this question is very humble but difficult to answerThe answer I recommend is from the essence of javacript language.The simple types of JavaScript include numbers, strings, Boolean values (True and false), null values, and undefined va

string that identifies the object type.Extended markup for object (Extensible Flag): Indicates whether a new property can be added to the object (in ECMAScript5).Three types of JavaScript objects and two types of properties:built-in objects (native object): An object or class defined by the ECMAScript specification. such as arrays, functions, dates, and regular expressions.Host Object (Host object): defined by the host environment embedded by the

basic js learning solution, which is very rough, but it is suitable for you to understand the overview of client js. Instances that can be tried immediately, or beginners of js can immediately see the results. Step 2: You need a book that systematically introduces javascript, such as the rhino book (javascript authoritative guide ). W3school can tell you only wh

format control Deng can be recognized by JavaScript.This is the same thing as I said in my 2. In addition, JS supports Unicode escape notation. Note that space characters are \u0020, and horizontal tabs are \u0009, although they can sometimes produce similar effects but they are inherently different, as are the newline characters \u000a and carriage return \u000d.4. Miscellaneous.Because this section is more broken, it is written as miscellaneous, including comments, identifiers, keywords, semi

# The JavaScript authoritative guide notes-part 1thDescription: Printed version: April 2012 1th Edition, September 2016, 17th time printing.The style of the book and "effective Java" very similar, recommended.This note is recorded in reverse order.-----------------------------| Node's HelloWorld program: "' js//! program.js//runs by typing ' node program.js ' on the command line and then opens the URL ' 127

JavaScript does not have an authoritative coding style guide and replaces some of the popular coding styles: Copy Code code as follows: Google's JavaScript style guide (hereinafter referred to as Google) Http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml NPM Coding Style (hereinaft

"JavaScript authoritative guide" Reading notes--second javascriptjsjavascript authoritative guideToday is 196 days this year, share today's reading notes.2nd Chapter Lexical Structure 2.1 character setJavaScript programs are written in the Unicode character set.Unicode is a superset of ASCII and Latin-1 and supports almost all languages.ES3 requires support for Unicode 2.1 and subsequent versionsES5 require

This article is very deep in my heart, especially in the first half of the paragraph. It is hereby collected.Chinese translation: http://www.zcfy.cc/article/the-ultimate-guide-to-javascript-fatigue-realities-of-our-industry-3914.htmlEnglish Original: http://lucasfcosta.com/2017/07/17/The-Ultimate-Guide-to-JavaScript-Fa

First, the Language foundation 1.javascript, only null and undefined are values that cannot have methods, and they do not have wrapped objects. typeof null = = ' object ', typeof undefined = = ' undefined ' 2. In JavaScript operations, overflow returns infinity, Underflow returns 0, also That is, divisible by 0 does not error, but returns infinity. and 0/0 returns Nan. 3.NaN is special, it is not

; undefined is a predefined global variable whose value is undefined, read-only, non-keyword.6. Global object.This is actually a bit of a relationship with the scope. The global object is something that can be used directly, the JavaScript interpreter starts, or when the browser loads a new page, it creates a new global object and gives it a defined set of initial properties: Global attribute Undefined, global function isNaN (), constructor date (), e

, writing html,javascript and CSS to a file is super cool and feels like unlocking a new world. ⊙ Operation Dom Problem: You occasionally need to manipulate the DOM Workaround: JQuery. Reason: Yes, jquery is still alive, react and jquery are not incompatible. You think you can also use react native to provide ' queryselector ', but jquery's cross-browser compatibility can save you a lot of trouble. Other options: Dojo (not su

JSJavaScript is not the same as C JAVA C # He doesn't have his own block-level scope, and of course you can simulate it in some way, as we'll talk about later.for (var i =0; iAssuming Java then the variable I will be destroyed immediately, but in JS it! Still existsquery identifiers in JSvar color = "Blue"; function GetColor () { //var volor = "Red"; return color;} Alert (GetColor ()) //blue//assumes that the gaze removed from the GetColor () is returned by the redYes, in JS, the iden

1. Note:true // This creates a property named " -1.23" // This 1001st element of the array // Array index 1. Same as a[1]2. Delete operator produces sparse array3, set the length of the array will automatically cut off or add undefined4.javascript does not support a true multidimensional array but can be approximated by an array of arrays5. Splice modifies the array of calls, and slice does not6, using Unshift () is a one-time insertion instead of a s

of all matching elements function FindAll (a,x) { var results = []; len = a.length, pos = 0; while (Pos pos = a.indexof (X,pos); if (pos = = =-1) break; Results.push (POS); pos = pos + 1; } return results; } 7.1 Array Type You can write this in es5. Array.isarray (); Instanceof Array is unreliable var IsArray = Function.isarray | | Function (o) { return typeof o = = = ' object ' Object.prototype.toString.call (o) = = = ' [Object Array] '; }; 7.12 as an array of strings var s

1. Interface design Index.html: Only a placeholder for the location where the wizard is displayed Copy Code code as follows: STYLE.CSS: By default, the wizard has a H2 rendered title, a main content of the UL present, a div-presented button bar, we simply designed their default appearance, the actual application of the people can be free to beautify them. Copy Code code as follows: body{ margin:0; } /* Guide