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in Python, variable lookup follows the LGB principle of prioritizing a variable in a local scope (regional scope), failing to find it in the global scope, and finally attempting to build the scope again (build-in Scope), and throws an exception if
Scope (scoping)The JavaScript scope is confusing because its program syntax itself is long like the C-family language. My understanding of scopes is a closed space that only has an effect on a range and does not have an impact on the outside. In
Variable scope"The scope of a variable represents the context in which the variable exists. It specifies which variables you can access and whether you have permission to access a variable. ”
Variable scopes are divided into local scope and global
Scope (scoping)
One of the most confusing places for JavaScript beginners is the scope; in fact, not just beginners. I've seen some experienced JavaScript programmers, but they don't understand scope very deeply. The JavaScript scope is confusing
Each programming language, its variables have a certain range of valid, beyond this range, the variable is invalid, which is the scope of the variable. From the point of view of mathematics, it is the field of the independent variable.
Scopes are
What is the result of the following program?
Copy Code code as follows:
var foo = 1;
function Bar () {
if (!foo) {
var foo = 10;
}
Alert (foo);
}
Bar ();
The result is 10;
What about the bottom one?
Copy
Scope of the variableA variable's scope (scope) is the area in the program that defines the variable.Global variables scope (scope) is global, that is, in JavaScript code, it is defined everywhere.Variables declared within a function are defined
Java BASICS (7: interface, variable scope, and parameter transfer)I,Interface
Java does not allow a subclass to have multiple direct parent classes, that is, any subclass can have only one direct parent class. However, a class can implement multiple
Detailed description of the javascript Execution Environment and scope, and detailed description of javascript
I recently reread "javascript advanced programming 3" and thought I should write some blogs to record some of my learning knowledge.
What is the result of the following program? Varfoo1; functionbar () {if (! Foo) {varfoo10;} alert (foo);} bar (); the result is 10. What about the following? Vara1; functionb () {a10; return; function... SyntaxHighlighte
What is the result of the
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