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. 在Boolean表示大中，所有对象都会被自动转换为true 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. delete只能删除开发者自定义的方法和属性。 10. js中的对象的内在表征是key value集合 11. js不允许overload 12. 每个函数的调用堆栈中都有一个arguments对象 13. Function class:var f = new Function(argument1, argument2, …, argumentN, function_body_string) e.g. var f = new Function(“n”, “alert(n)”) 14. 判断时区使用的是否是夏令时 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,
网速很慢，但又得打开 Flash 是一件很痛苦的事情，特别是 Silverlight 来临之际，这个技术可能有点用
具体代码如下
<SCRIPT LANGUAGE="JavaScript">
var starttime = new Date()
</SCRIPT>
<img src="images/ConvLogo.JPG?id=<%Int(37462 * Rnd +&n ......
