How to measure a person's JavaScript level

Basics
1, what are namespaces, variable pollution, variable declaration elevation, precompilation? How do I check whether a global variable is declared after a piece of code executes?
2, rules for implicit conversions
3, about objects, what are the attributes (attribute) of an object's properties? What is a prototype chain? How do I detect whether a property is in an object or in a prototype chain? How do I detect a normal object or an empty object? Write a factory model? (Factory mode also has a lot of details, specifically can refer to the "javascript mode" book, not "JavaScript design mode")
4, Variable type detection, feature detection, and exception avoidance
5,settimeout Properties
6, array of several API manual implementations
7, event
8, regular expressions, at least understand the meaning of $ and \1 and the usage of several APIs.
9,javascript How do I get random Unicode characters?
10,json.parse parameters cannot be processed when they are passed to an object? (You can try Json.parse (window)) The first parameter of the
11,fn.apply is the context (which is the function runtime), so what happens when this parameter is passed to an array?
dom Operation
1, implementing some APIs such as Getelementsbyclass (with a lot of details, see Masaki's blog)
2, various width heights (clientheight, etc.) Meaning and differences between browsers
3, implement an insert DOM node API with callback function (consider script tag, documentfragment)
CSS Action
1, how to manipulate the pseudo-class and pseudo-elements of CSS?
2, how to detect whether the browser supports a CSS3 feature?  
Ajax Operations
1,get and post differences and points of use
2,http protocol, including format, status code, cookie Operation
3, cross-domain
4, several ways to convert JSON , what are the usage restrictions for json.stringfy? What are the performance optimizations for

performance
1,javascript? Can see "High-performance JavaScript"  

synthesis : Design ideas for various plugins

How to measure a person's JavaScript level