javascript stuffs

Primitive types
1. undefined, null, boolean, number, string; undefined is derived from null.
e.g. var tmp; typeof tmp == undefined.
e.g. void(javascript:aler(¡®x¡¯)) == undefined.
e.g. undefined==null
2. NaN!=NaN isNaN(¡°123¡±)==false isNaN(¡°blue¡±)==true
3. var num = 10; num.toString();num.toString(2);num.toString(8);num.toString(16) 4. parseInt, parseFloat 5. object class     properties: constructor, prototype     methods: hasOwnProperty(property), isPrototypeOf(object), propertyIsEnumberable(property),toString(),valueOf() 6. ÔÚBoolean±íʾ´óÖУ¬ËùÓжÔÏ󶼻ᱻ×Ô¶¯×ª»»Îªtrue 7. Number class: toFixed, MAX_VALUE, POSITIVE_INFINITE, NEGATIVE_INFINITE, toPrecision, toExponential 8. String: length, charAt(), concat, indexOf, lastIndexOf, localeCompare, compare, subString, slice, toLowerCase, toLowerCase, toUpperCase, toLocaleUpperCase, split 9. deleteÖ»ÄÜɾ³ý¿ª·¢Õß×Ô¶¨ÒåµÄ·½·¨ºÍÊôÐÔ¡£ 10. jsÖеĶÔÏóµÄÄÚÔÚ±íÕ÷ÊÇkey value¼¯ºÏ 11. js²»ÔÊÐíoverload 12. ÿ¸öº¯ÊýµÄµ÷ÓöÑÕ»Öж¼ÓÐÒ»¸öarguments¶ÔÏó 13. Function class:var f = new Function(argument1, argument2, ¡­, argumentN, function_body_string)       e.g. var f = new Function(¡°n¡±, ¡°alert(n)¡±) 14. ÅжÏʱÇøʹÓõÄÊÇ·ñÊÇÏÄÁîʱ      e.g. d1 = new Date(2008,6,1); d2 = new Date(2008,6,1); support = d1.getTimezonOffset()!=d2.getTimezoneOffset(); 15. undefined, NaN, Infinity, Object, Array, Function, Boolean, String, Number, Date, RegExp, Error, EvalError, ReferenceError, SyntaxError, TypeError, URIError 16. Math class: E,LN10,LN2,LOG2E,LOG10E,PI,SQRT1_2,SQRT2,min,max,ceil,floor,round,pow,exp,sin,cos,tan,atan,atan2,asin,acos 17. window.open(uri, [frame_name|top|parent|self|blank],parameter)       where parameter: left, top, height, width, resizable, scrollable, toolbar,