201506021641_ "JavaScript authoritative guide" (p25-38)

1. Using Unicode encoding

2. JavaScript has: function classes (functions), array classes (arrays), error classes (Error), regular classes (REGEXP), date classes (dates)

3. A piece of code showing the system time: var t = new Date (), var t1 =t.getfullyear () + "Year" +t.getmonth () + "month" + t.getdate () + "Day" + t.gethours () + "when "+ t.getminutes () +" min "+ t.getseconds () +" seconds "; alert (t1);

4. Javascrip prohibit octal

5.2 square root math.sqrt (2);

2 cubic root math.pow (2,1/3);

6. Max/max----->nan

sqrt (-N)-------->nan

7. Global variables infinity and Nan represent infinitely large and non-numeric.

Eg:var a = infinity; can be written and readable

var a1 = positive_infinity;//Read Only

8. IsNaN ();

Isfinite (); is a number or is not infinity,-infinity is return true

9. Because JavaScript is a drawback to floating point calculation, it is better to convert the amount into an integer "score" in financial calculations.

10.

201506021641_ "JavaScript authoritative guide" (p25-38)