1-1 Introduction to frame design

2-1 Selector Engine-1-Traditional method of obtaining elements

2-2 Selector Engine-2-Functionalization

2-3 selector engine-3-optimize each-1

2-4 selector engine-4-optimize each-2

3-1 Use optimized get and each to set styles

3-2 Add container parameters to the get method

3-3 Design the get method to achieve the acquisition of basic selector elements

3-4 Detection of byclassName method and efficiency upgrade

3-5 Implement a complete capability testing method

3-6 Implementation of getClass method

3-7 Handle push compatibility in IE

3-8 Extension - Ideas for optimizing push

3-9 Integrate js functions

3-10 Implement the search for elements under a certain DOM object

3-11 Assume the context is a dom array

3-12 Handle the case where the context parameter is a string

4-1 Analyze compound selector structure

4-2 Implement a combined selector

4-3 Handling descendant element selectors - ideas

4-4 Handling descendant element selectors - implementation and verification

5-1 Summary of ideas-pseudocode and simplified writing methods