JavaScript DOM Programming Art

4th: JavaScript Picture Library

Multiple pictures of the problem, think about doing an example:

How event handlers work: Once an event occurs, the corresponding JS code is executed once the element has been added to the event handler function.　The called JS code can return a value that will be passed to the event handler. Generally returns TRUE or FALSE. True event handler function: event occurs false: Event not seen

Nodetype:1: Element Node 2: Attribute node 3: text node

Nodevalue:element[0].nodevalue = = Element.firstchild LastChild usage is the same;

Note: The nodevalue of text in NodeValue is null,p, such as <p>hello</p> p, is hello.

　　

JavaScript DOM Programming Art