1-1 js introduction methods and variables

1-2 js variable types and logical operators

1-3 js function

1-4 js arrays and objects

2-1 Get node

2-2 Get properties

2-3 Node operations

2-4 event binding

2-5 Event bubbling

2-6 Form objects and drop-down boxes

3-1 timer

3-2 Autoplay tab

3-3 Autoplay tab

3-4 Lazy loading

3-5 Lazy loading

3-6 Waterfalls flow

3-7 Waterfalls flow

3-8 sports

4-1 ajax use

4-2 ajax cross domain