scope of declaration

I'm sure you'll be confused about the scope, scope chain, and variable declaration promotion concepts when you get started with JavaScript.Javascript ScopesIn Javascript, there are only local scopes and global scopes. Instead, only functions can

ObjectiveIn the 12th chapter, in the description of variable objects, we already know that the data (variables, function declarations, and function parameters) of an execution context are stored as attributes in the variable object. We also know

In some C-like programming languages, each piece of code within the curly braces has its own scope, and the variables are not visible outside the code snippet that declares them (i.e. we cannot directly access the variables declared within the code

in the 12th chapter of the description of variable objects, we already know that the data of an execution context (variables, function declarations, and formal parameters of functions) is stored as attributes in the variable object. We also know

This is a creation in Article, where the information may have evolved or changed. 1. Block The block is a pair of curly braces that enclose the declaration and statement. Block = "{" {statement ";"} "}". In addition to the explicit source block,

PrefaceIn the description of the variable object in Chapter 12th, we already know that the data of the execution context (variables, function declarations, and function parameters) are stored in the variable object as attributes. At the same time,

JavaScript variable declaration elevation (hoisting) JavaScript's variable declarations have a hoisting mechanism, and the JavaScript engine, when executed, promotes the declaration of all variables to the front of the current scope .Look at a piece

1. BlockThe block is a pair of curly braces that enclose the declaration and statement. Block = "{" {statement ";"} "}".In addition to the explicit source block, there is an implicit block: The full domain block contains all

http://www.cnblogs.com/wolf-lifeng/p/3156936.html2.3 Global Scope 2.3.1 OverviewThe global scope is the largest namespace scope, unlike the user-defined namespace scope, where the global scope does not need to be defined, and it naturally exists in

Deep understandingJavaScriptSeries ( -): Scope chain(Scope Chain)ObjectiveIn the 12th chapter of the description of variable objects, we already know that the data of an execution context (variables, function declarations, and formal parameters of