notes:javascript_cheat_sheet
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notes:javascript_cheat_sheet [2026/06/07 12:08] 114.119.135.37 old revision restored (2008/09/05 13:39) |
notes:javascript_cheat_sheet [2026/06/07 15:47] (current) 38.252.202.246 old revision restored (2008/09/04 02:23) |
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| * Statements may omit the final semi-colon but should not. | * Statements may omit the final semi-colon but should not. | ||
| * Blocks may be grouped together using curly braces { }. | * Blocks may be grouped together using curly braces { }. | ||
| - | * JavaScript uses java-style comments: | + | * JavaScript uses java-style comments: // and /* */. |
| * JavaScript variables are case-sensitive and must begin with a letter or underscore. | * JavaScript variables are case-sensitive and must begin with a letter or underscore. | ||
| * Variables are automatically declared when first used but should be explicitly declared using e.g. var a = 5; | * Variables are automatically declared when first used but should be explicitly declared using e.g. var a = 5; | ||
| Line 35: | Line 35: | ||
| ==== Basic Structures ==== | ==== Basic Structures ==== | ||
| - | * if {} else if {} else {} | + | * |
| - | * for (var=start; | + | |
| - | * while (condition) {} | + | |
| - | * do {} while (condition) ; | + | |
| - | * //break// and // | + | |
| - | * for (element in array) {} | + | |
| - | * for (property in object) {} | + | |
| - | * switch (n) { case 1: stmt; break; default: stmt; } | + | |
| - | * function name(var1, | + | |
| - | * \", \n, \t, \r, \', \&, \\ | + | |
| - | + | ||
| - | ==== Events, Error Handling and Popups ==== | + | |
| - | * try { throw " | + | |
| - | * onerror=handleErr; | + | |
| - | * if handleErr returns false, browser displays a standard error message in the JavaScript console. | + | |
| - | + | ||
| - | * an alert box just has an OK button - alert(" | + | |
| - | * a confirm box returns true if the user clicks OK, false if he clicks cancel - confirm(" | + | |
| - | * a prompt box allows the user to enter a value. It returns true if the user clicks OK, false if he clicks cancel - prompt(" | + | |
| - | + | ||
| - | * JavaScript functions can be registered to run on certain events (event=" | + | |
| - | * onunload, onload (page or image), onresize, onabort | + | |
| - | * onfocus, onblur, onclick, ondblclick | + | |
| - | * onmouseover, | + | |
| - | * onchange, onsubmit, onreset, onselect | + | |
| - | * onkeydown, onkeypress, onkeyup | + | |
| - | * onmousedown, | + | |
| - | + | ||
| - | ==== JavaScript Objects ==== | + | |
| - | * JavaScript is an Object Oriented Programming Language. | + | |
| - | * Objects have properties and methods. | + | |
| - | * String objects have a length property and methods including: indexOf, match, replace | + | |
| - | * new Date() creates a Date object (with today' | + | |
| - | * Date objects include methods: getTime(epoch), | + | |
| - | * Date objects can be compared using <, > . | + | |
| - | * To declare an array <code html> var mycars=new Array(" | + | |
| - | * Arrays have methods including: sort, concat, join. | + | |
| - | * To sort an integer array, must use a function <code html> function intSort (a, b){ return a - b; | + | |
| - | * The Math object contains common math routines: round, random, e, pi etc. | + | |
notes/javascript_cheat_sheet.1780859330.txt.gz · Last modified: 2026/06/07 12:08 by 114.119.135.37
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