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
Read "You don't know JavaScript" a book to make a note;Compiler principle:JS is a compiled language, similar to the traditional compilation language, the traditional compilation process is divided into three stages;1. Word segmentation/lexical
xTable of Contents [1] lexical [2] dynamic front wordsMost of the time, the main reason we are confused about scopes is whether we should make variable lookups in terms of the nesting order of function locations or in the order in which functions
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
Recently in the study of JS, found themselves on the scope, scope chain, activity object of these concepts, understand is not very clear, so read the Big God Blog and other articles at the Tian Xiao Plan, benefit, write this essay is his own reading
Each programming language has a valid range of variables, beyond which the variable is invalidated, which is the scope of the variable. From a mathematical point of view, it is the domain of the independent variable.Scope is the accessible scope of
Each programming language has a valid range of variables, beyond which the variable is invalidated, which is the scope of the variable. From a mathematical point of view, it is the domain of the independent variable.Scope is the accessible scope of
From how the browser compiles the JS code.I've been thinking for a long time, when we give the code to the browser, how the browser transforms the code into a vivid Web page. JS engine before executing our code, what the browser did to our code, the
Analysis of JavaScript scope chain, execution context and closure, analysis of javascript
Closure and scope chain are important concepts in JavaScript. I have read some documents over the past two days and summarized the relevant knowledge points as
Document directory
Key points of the syntax analysis tree
You should have written a similar code. In fact, what I want to express here is that sometimes a method definition is 108,000 different from that used. When the method is executed, what
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.