Study notes. JavaScript Basics (i)

1. JavaScript is a programming language that you can use to add interactive properties to your Web pages.

<! DOCTYPE html>
The above code performs DOM operations through JavaScript and adds "Hello,cleveland" under node H1 when the page loads.
2. Can not do: 1) do not allow to write files on the server, 2) cannot close the window not opened by itself; 3) You cannot read information from an already open Web page from another server.
Each object in a 3.DOM tree is called a node of a tree, and you can use JavaScript to modify any aspect of the tree, including additions, deletions, modifications, and accesses. If the node contains an HTML tag, it is the element node, otherwise called the text node. ELEMENT nodes can contain text nodes.
4.JavaScript uses the event handler's command to handle the event. The usual event handlers are as follows:
Onabort loading of user-terminated pages
Onblur The user has left the object
onchange the user modified the object
The onclick user clicked on the object
The OnError script encountered an error
onfocus User activated the object
Object completes the load
onMouseOver the mouse pointer over the object
The mouse pointer leaves the object
Onselect user selects the content of the object
OnSubmit user submitted the form
OnUnload User leaves the page
5.HTML: Contains the content and structure of the page;
CSS: Control the appearance and performance of the page;
JavaScript: Controls the behavior of the page.
6.<div>, <span> is a range label, and the contents of each <div>, <span> should have similar meanings. <div>
is a block-level element that has a physical newline between the elements and the front and back;<span> is in line and can be applied to a sentence.
7.CSS # for ID,. For class.
This article is from the "Technology No Peak" blog, please be sure to keep this source http://shelia.blog.51cto.com/2930476/1621788
Study notes. JavaScript Basics (i)