Chapter 2 Brief History of Javascript
Dom: stable degradation, progressive enhancement, user-centric design
Chapter 1 Javascript Syntax 1. programming languages are divided into two categories: Explanatory (javascript) and compiled (java, C ++)
2. variable scope: If a function uses var, the variable is regarded as a local variable and only exists in the context of the function; otherwise, it is a global variable, if a global variable with the same name already exists in the script, this function will change the value of that global variable (which appears later.
3. built-in objects (Array, Math, Date, etc.), host objects (objects provided by the browser) (Form, Element, Image, document (any Element on a live webpage ))
4. BOM DOM
Chapter 2 DOM1. three DOM methods to obtain element nodes
Document. getElementById (); document. getElementsByTagName (); document. getElementsByClassName ();
2. In Javascript, null indicates no value.
3. Element Method: getAttribute (); setAttribut ();
Chapter 1 Case Study: Javascript Image Library
Chapter 1 Best Practices 1. Stable degradation and progressive enhancement
2. Using attributes such as onclick in Html documents is inefficient and may cause problems
Chapter 2 Case Study: Upload addLoadEvent () to the script
Chapter 1 Create dynamic notation 1.doc ument. write (); not recommended
2. innerHTML (); insert a large part of HTML content. to process the inserted content, you need the precise attributes and methods provided by DOM.
3. In DOM, a document is a node tree.
4. CreateElement (); CreateTextNode (); appendChild (): connects a node to a part of the document tree, or connects two nodes that are not part of the document tree.
5. Create and insert a new node using the DOM method: createElement (), createTextNode ();
6. parentNode. insertBefore (newElement, targetElement );
7. insertAfter () is included in the script.
8. When Ajax clicks a link and sends a request to the server, wait for a whole page to be returned. Ajax can update only a small part of the page. The core of Ajax technology is XMLHttpRequest.
9. Hijax progressively enhanced Ajax
10. SEO search engine optimization
Chapter 1 enrich the content of the document 1.for( variable in array) when the first cycle, variable indicates the lower mark value of the first element in array; the second cycle indicates the lower mark value of the second element; value to the last loop. "For (... in...) loops are used to traverse arrays whose values are not integers"
2. Microsoft does not support the abbr element until IE7.
3. Javascript scripts should only be used to enrich the content of documents. Avoid using DOM technology to create core content.
Chapter 4 CSS-DOM1. <p id = "elem" style = "color: #000; font-family: Arial, Sans-Serif;"> </p>
Var para = document. getElementById ("elem"; alert (para. style. color); alert (para. style. fontFamily); minus sign contained in the hump identity conversion attribute
2. the attribute value of the style object must be enclosed in single quotes or double quotation marks. Otherwise, it will be interpreted as the variable para. style. color = "black ";
3. DOM technology (Javascript) should not be used to create important HTML content, nor DOM technology should be used to create important style information. At most, document styles can be supplemented.
4. Design of general functions
Chapter 1 animation effects with Javascript Chapter 2 HTML5 Chapter 2 comprehensive example
