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OverviewHistory, Features, and Syntax
Monday, August 31, 2009
History
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In the beginning, Netscape created JavaScript
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And Microsoft saidit was good
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Red-Headed Step ChildMonday, August 31, 2009
AJAXMonday, August 31, 2009
Asynchronous JavaScriptAndXML
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Monday, August 31, 2009
Frameworks
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The browser and beyond...
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Features
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Dynamic
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Object Orientedand
Functional
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Prototype Based
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JSONportability of data to and
from any programming language
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Examples
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Monday, August 31, 2009
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Syntax
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case sensitiveapple != Apple
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whitespace and semicolons
var a = 2;var b = 3;
return a + b;
returna + b;
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comments// this is a single line comment
/* thisisa multiline comment */
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reserved wordsbreak else new var case finally return void catch for switch
while continue function this with default if throw delete in try do instanceof typeof
abstract enum int short boolean export interface static byte extends long super char final native synchronized class float
package throws const goto private transient debugger implements protected volatile double import public
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Data Types
• numbers: 1 2 3 4 etc.
• strings: “some word” ‘also a string’
• booleans: true false
• null and undefined
• dates: new Date()
• functions: function () { ... }
• objects: {foo: ‘bar’}; a.foo // ‘bar’
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Debugging
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Firebug (Firefox)
http://getfirebug.com/
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Web Inspector (Safari)
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