DOM入门知识结构

Some of the important DOM objects

1. window object
2. location object
3. document object
4. form object
5. history object

What is dom?

Hierarchy of objects

How to access username using  Dom

DOM top level objects

1. Navigator  object
2. Window Object
3. History Object
4. Location Object
5. Document Object
6. Form Object

Form Validation

Advantages of Client side Validation

Using alert() method for debugging