JavaScript Programming specification

1. Strictly case-sensitive


2, the statement end can have a semicolon, or there can be no semicolon, semicolon is not required, there is a semicolon more canonical.


3.//For single-line comment/* Multiline comment */


4, variables can not be declared directly used, variables are all variant types


5. In JS, the first character of the built-in object is capitalized by the first letter of the second word.
var d = new Date ();
D.getfullyear ();
Window.alert ();
Window.setinterval ();
Window.settimeout ();


6. Object-based Advanced scripting language
Browser object, Window object, Document object Dom


7, strings can be included with single quotation marks, or you can use double quotation marks to include

JavaScript Programming specification