Quickly get a front-end JS interview-Summary of JS basic knowledge

JS basic knowledge summary

Chapter 2 JS Basics-Variable Types and Calculations [No variables, don't say you know JS] https://blog.csdn.net/Sabrina_cc/article/details/105449535

Chapter 3 JS Basics-Prototype and Prototype Chain [One of the three mountains, must be tested! 】 Https://blog.csdn.net/Sabrina_cc/article/details/105492600

Chapter IV JS basis - Scope and closure of the two [three big mountains, not closure, will not pass the basic] https://blog.csdn.net/Sabrina_cc/article/details/105496638

Chapter 5 JS Basics-Asynchronous [Three of the three mountains, must be tested! 】 Https://blog.csdn.net/Sabrina_cc/article/details/105509219

Content summary

1. Variable types and calculations
2. Prototype and prototype chain
3. Scope and closure
4. Asynchronous and single thread

Topic summary

1. Typeof can judge those types?
2. When to use == and ===?
3. What is the difference between value type and reference type?
4. Handwritten deep copy?
5. How to accurately judge whether a variable is an array?
6. Handwritten simple jQuery, considering plug-ins and scalability?
7. How to understand the essence of Class prototype?
8. This is no application scenario?
9. Handwriting bind function?
10. Application scenarios of closures in actual development, for example
11. Create 10 a tags, click to pop up the corresponding serial number
12. The difference between asynchronous and synchronous
13. Handwriting promise to load pictures
14. What are the scenarios where the front end uses asynchronous?
15. Scene Question Timer

Knowledge point

1. Value type vs reference type, stack model, deep copy
2. Typeof operator
3. Type conversion Truly and falsely variable
4. Class and inheritance, combined with handwritten jQuery example understanding
5. Instanceof
6. Prototype and prototype chain: illustration & execution rules
7. Scope and free variables
8. Closures: two common ways & free variable search rules
9. This
10. The difference between single thread and asynchronous, asynchronous and synchronous
11. Front-end asynchronous application scenarios: network requests & scheduled tasks
12. Promise to solve Callback hell