JavaScript basics variables and function declarations

Source: Internet
Author: User

1. The reputation of variables

Window.name = ' Gjlin '; Global Variables Direct name = ' Gjlin ' also represents global variables, but it is recommended to use Window.name = ' Gjlin ' as a form of representation

var name = ' Gjlin '; Local variable var name = ' Gjlin ' In this form, be sure to record the preceding plus var.

2, JS's comment line:///MultiRow:/* content */

3. Definition and execution of functions

Name = ' 123 '
Foo ()//Execute function
Bar ()//Execute function

function definition
function Foo () {
var name = ' Gjlin ';
Window.name = ' Gjlin '
var name = ' Gjlin ';
var agr2 = arguments[1];

Print console logs can be used in the browser for debugging
Console.log (name);
Console.log (ARG2);

The representation of the return value
return name;

}

function Bar () {
Console.log (name);
Alert (name)
}

JavaScript basics variables and function declarations

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