function declaration

The JavaScript -- Item7 function and (name) function expressions you don't know1. function declaration and function expression In ECMAScript, the two most common methods for creating a function are function expressions and function declarations. The

This year fragmented read a few JavaScript books, look back to read the previous JavaScript learning notes, it is a bit embarrassing, highlighting the "superficial" two words, but the deeper the more profound the more and more deep, a kind of

Original: http://www.nczonline.net/blog/2010/01/26/answering-baranovskiys-javascript-quiz/--------------------------------------------------------------------------------------------------------------- ------------------------------------------------

Write it in front.Note: This article is read in-depth understanding of JavaScript after the deep feeling, so make notes convenient after the review.I feel this chapter is a bit esoteric .... Slightly difficult to understand AH.Just sit down and take

Original: http://www.adequatelygood.com/JavaScript-Scoping-and-Hoisting.html= = = Translation starts = = =Do you know what the following JavaScript script execution results are?1 var foo=1; 2 function Bar () {3 if (! foo) {4 var foo=10; 5

TopicTopic One:if (! (" A "in window) {var a = 1;} alert (a); topic two: var a = 1,b = function A (x) {x && a (--x);}; alert (a); Title III: Function A (x) {return x * 2;} var A;alert (a); topic Four: Function B (x, Y, a) {arguments[2] = 10;alert (a)

Among all the key knowledge that must be mastered in JavaScript, functions are a key point that we can easily ignore when learning. In the course of learning, there may be many people and many articles that tell you that object-oriented is very

The Var func=function and function func () do not have any difference in meaning, but their interpretation precedence is different :The latter is preceded by other statements at the same statement level.Thatvar k =function xx () {return 5;}}No

Original link: http://www.adequatelygood.com/JavaScript-Scoping-and-Hoisting.htmlJavaScript scopes and Declaration elevationDo you know the value of alert after JavaScript is executed?1 var foo = 1; 2 function Bar () {3 if (! foo) {4 var

We all know JS execution follows two rules1. function declaration Overall promotion2. Variable declaration PromotionIn fact, the most important thing is pre-compilation, pre-compilation often occurs before the function execution, understanding of

In general, when we write JavaScript, we like to first name an empty function (such as code 1), I feel this will consume some performance, and the code is written more. You can actually declare the function you want to write without first declaring

First, the function type1.1 in JS, each of these functions is an instance of the function type. And, like all other types, have properties and methods. Because the function is an object, the function name is actually a pointer to the function object.

JavaScript is quite casual compared to other programming languages, so the JavaScript code is full of all kinds of exotic work, and sometimes, of course, understanding the various types of writing is a further insight into JavaScript language

In this article, the author starts with the error about delete in the JavaScript object-oriented Programming Guide, detailing the implementation of the delete operation, limitations, and performance in different browsers and Plug-ins (refer to

function expressions and Function declarations In ECMAScript, the two most commonly used methods of creating functions are function expressions and function declarations, and the difference between the two is a bit faint, because the ECMA

JS variable PromotionFor most JS developers, variable elevation can be a very common problem, but many people may not be particularly aware of it. So here, I'd like to say a few words.Let's start with a simple example:a = 2;var a;console.log(a);What

In this article, I'll delve into the most basic part of JavaScript-the execution context (execution). After reading this article, you should be aware of what the interpreter does, why the functions and variables can be used before the declaration,

1, function declaration and function expression In ECMAScript, the two most commonly used methods of creating functions are function expressions and function declarations, and the difference between the two is a bit faint, because the ECMA

This article mainly introduces the Hoisting mechanism in JavaScript, which involves issues related to variable declaration in JS. For more information, see Hoisting Mechanism The javascript variable Declaration has the hoisting mechanism. During

An anonymous function is a function that is dynamically declared at runtime. They are called anonymous functions because they do not have function names. 1. Anonymous Functions An anonymous function is a function that is dynamically declared at