openid scope

To understand the scope range of a variable, you have to understand the scope chain first.When you declare a variable with the var keyword, you add a property to the object that contains the variable.Scope chain: Because JS is a variable of the object's properties, and the object may be another object's properties, and all objects are properties of the Window object, so the relationship of these objects can

1. Scope The so-called scope is that variables are defined in the body of the function that declares them and in any function that is nested within the function body. function scope () {var foo = ' Global '; if (window.getComputedStyle) {var a = "I ' m if"; Console.log ("if:" +foo); If:global} while (1) {var b = ' I ' m while '; Console.log ("while:"

Although in peacetime seemingly, very accustomed to some usage but really want to understand these concepts, it really took a lot of effort, now although can not be said to understand but finally have some experience. All right, let's go straight down.Note This article (*) is a related linkExample 1.1Lexical scope rules: the nested relationship of a function is determined when it is defined, not when it is called, that is, the lexical

For native types on $scope, such as $scope.name= ""; When you get a variable from a scope, you look for the scope itself, and you find the parent scope When modified, if the scope does not exist, a variable is created in this

has been a bit confused on the scope of JS, today by chance to read JavaScript authoritative guide, immediately be attracted to, write really good. I look at the sixth version, quite thick, about 1000 pages, JS Broad and profound, to be familiar with the need to master the great perseverance of Kung Fu.One: function scopeLet's look at a short piece of code:The first sentence output is: "Undefined", not "global"The second output is: "Local"You might th

Http://www.angularjs.cn/A09C The following methods create a new child scope and prototype inheritance:,,, ng-repeat ng-include ng-switch ng-view ng-controller ,, scope: true and transclude: true create directive. The following method creates a new independent scope without prototype inheritance: scope: { ... }

Scope is always a priority in any programming language because it controls the visibility and life cycle of variables and parameters. Here, you first understand two concepts: block-level scope and function scope.What is a block-level scope?Any set of statements in a pair of curly braces ({and}) belongs to a block, and all variables defined in it are not visible o

"Base" PHP variable and variable scope, PHP variable scope The newly-learned PHP, more interesting syntax, recorded. 1. Scope of variables The scope is only two global and local,global relative to the entire. php file, Local is the minimum range, which is the closest range of distance variables, such as: In a function

1. product scope -- the features and Functions of a product, service, or product . 2. project scope -- Work must be completed to deliver products, services, or achievements with specified features and functions. 3. acceptance basis: the project scope is measured based on Project Management Plan ; determine whether the product

Original Sticker Address: http://pierrespring.com/2010/05/11/function-scope-and-lexical-scoping/Personally feel good writing, easy to carry, if there are errors, please correct me.Wikipedia defines Scope as follows:Tipically, scope is used to define the extent of information hiding--that are, the visibility or accessibility ofVariables from diefferent parts of th

Scope is always the most important in any programming language, because it controls the visibility and lifecycle of variables and parameters. Here, we first understand two concepts: block-level scope and function scope. What is a block-level scope? The set of statements in any pair of curly braces ({and}) belongs to

Main content:1, analyze the meaning of JavaScript lexical scope 2. The scope chain of analytic variables 3. What is the name of the variable? In a recent lecture on JavaScript on the podcast, many friends feel that JavaScript is so simple, but I don't know how to use it, so I have some content for you to share.This series focuses on the content of the advanced part of JavaScript, including

First, Scope1.1. Global scope(1) The outermost function and the variables outside the outermost function have global scope:1 varI=1;2 functionA () {3 varaw= "QW";4 Console.log (AW);5 functionBa () {6 varQq= "AAA";7 }8 }9 Ten Console.log (i); One Condole.log (AW); A a (); - - //1 the //uncaght Referenceerror:aw is not defined (...) - //QW(2) All non-declared variables are automatically declared to have glob

There is a document that defines a function func (), while embedding an IFRAME in the document, the method of calling the parent window in this iframe: Parent.func (), originally I thought this function's environment is in this IFRAME itself inside , the test found that although this function was called in the IFRAME, the operating environment is still in the parent window.So also verified in the JS authoritative guide:JS functions run in their defined scope