zhu zhu's List: JavaScript

• The following table lists the meta-characters that can be used in JavaScript  regular expressions. These have special meaning inside a regular expression
• zero or more preceding term
• [^...]
• Not one of set
• At beginning of line
• At the end of a line

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• JavaScript execution context
• avaScript knows of three execution contexts:

  • Javascript execution environment is in which a piece of Javascript code executes
• The global execution context
• The function execution contex
• The eval() execution context
• Each execution context has an associated scope,
• The scope of the global execution context
• he scope of a function execution context
• The scope of the eval() execution context
• return eval(_rows * _columns);

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• URL location to ch03_1.html.

• open a prompt box,
• assign whatever the user types to the variable,

• (form.text1.value)"

  • use the text1 as value in the form part which is the value passing into the function in javaScript
• text box is named text1.
• text that was typed is called form.text1.value

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• The Form is a JavaScript user's best friend. Forms can be used to input text, to display results, and to trigger JavaScript functions.

  • From is a tag in XHTML which include check-box, control button, create them and get ot sent messge, and so forth
• The text box should include a NAME and a TYPE
• The button is how we tell JavaScript to run a particular function
• The VALUE is the label which will appear inside the button.
• The ONCLICK is followed by the name of a function,
• onClick

  • this is something like event which trigger the function to run

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• nformation can be captured in the form using  many different form-specific elements.

• defines a form that includes a range of inputs and  controls

• You can name your functions anything you want.

• you need to include the comment tags to keep your JavaScript   from showing up on the Browser.
• < !--
• // - End of JavaScript - -->

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• Javascript is an easy-to-use programming language that can be embedded in the header of your web pages

  • (1) it is a programming language
    (2)can be embeded in head of web page(HTML/XHTML)
• It is powerful enough to write major applications and insert them in a web page as a special object called an "applet."

  • applet is a special object written in JAVA language
    and it is application in web page
• No compiling, no applets, just a simple sequence.

  • Javascript is just a simple sequence, no compling, no applet
• OOP is a programming technique
• Object-oriented programming consists of Objects, Methods and Properties.
• An object is basically a black box which stores some information.
• other information may require you to use a method to access it
• The directly accessible bits of information in the object are its properties.
• objects, events, methods, and properties.
• Javascript
• Any table, form, button, image, or link on your page is also an object. Each object has certain properties (information about the object).
• Your web page document is an object.
• Methods

  • you do something using the method of object
    because:
    (1)web page document is an object
    (2)any button, elements are object too.
• Events are how we trigger our functions to run.

  • this is just like if-else conditional control command in JAVA

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• A selector comprises every part of a rule set up to
• , the selector is  h2:

• An at-rule is an instruction or directive to the  CSS parser.
• at-keyword:

  • @ is called at