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--- notes:javascript_cheat_sheet [2026/09/14 11:20]
188.71.250.172 old revision restored (2026/08/02 17:26)
+++ notes:javascript_cheat_sheet [2026/09/15 05:17] (current)
186.158.200.169 old revision restored (2026/08/04 16:54)
@@ Line 8: / Line 8: @@
   * JavaScript is the most popular scripting language on the internet and works in all major browsers.
-  * It is a lightweight, interpreted language that is embedded into webpages to add interactivity.
+  * It is a lightweight, interpreted, object-oriented language that is embedded into webpages to add interactivity.
   * JavaScript can read and write HTML page elements, react to events, validate data, create cookies.
   * JavaScript was invented by Brendan Eich of Netscape but is now known officially as ECMAScript (current version is ECMA-262).
@@ Line 55: / Line 55: @@
   * a prompt box allows the user to enter a value. It returns true if the user clicks OK, false if he clicks cancel - prompt("msg","defaultvalue");
-  *  JavaScript functions can be registered to run on certain events (event="jscode") in HTML elements:
+  *  JavaScript functions can be registered to run on certain events (event="jscode" in an HTML element):
     * onunload, onload (page or image), onresize, onabort
     * onfocus, onblur, onclick, ondblclick
@@ Line 62: / Line 62: @@
     * onkeydown, onkeypress, onkeyup
     * onmousedown, onmouseup
+==== JavaScript Objects ====
+  * 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's date).
+  * Date objects include methods: getTime(epoch), setFullYear, toUTCString, getDay, getHours
+  * Date objects can be compared using <, > .
+  * To declare an array <code javascript> var mycars=new Array("Saab","Volvo","BMW");</code>
+  * Arrays have methods including: sort, concat, join.
+  * To sort an integer array, must use a function <code javascript> function intSort (a, b){ return a - b;}</code>
+  * The Math object contains common math routines: round, random, e, pi etc.
+  * The RegExp object supports regexp creation and searching including methods: test (t/f), exec, compile (alter).
+  * HTML DOM objects allow access to browser and webpage.
+==== Advanced JavaScript ====
+  * navigator.appName/appVersion contain the browser name and version.
+  * document.cookie allows read and write access to cookie so to set a cookie <code javascript>
+function setCookie(c_name,value,expiredays)
+{
+  var exdate=new Date();
+  exdate.setDate(exdate.getDate()+expiredays);
+  document.cookie=c_name+ "=" +escape(value)+
+    ((expiredays==null) ? "" :
+     ";expires="+exdate.toGMTString());
+} </code>
+  *

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