Use of (), {}, [] in Javascript

(), Used in the expression to change the priority of the expression. For example:
(A + B) * C;
VaR F = function (){}
VaR F = (function (){})
Return (function () {}) // defines the anonymous function and returns
(Function () {}) () // defines an anonymous function and calls

{}, Used to define methods, define method blocks, and define objects directly. For example:
{// Define the method block. I variables can be accessed outside the method block.
VaR I = 1;
Alert (I + 1 );
Alert (I + 2 );
Alert (I + 3 );
Alert (I + 4 );
}
Alert (I + 5 );

VaR A = {PA: "1", Pb: "2"}; // define the object directly. The class of this object is anonymous, so the class-related attributes cannot be used, such as prototype.

[], Defining arrays. For example
VaR buffar = [
'<Div id = "',
'', // Index 1, div ID attribute
'"Style =" position: absolute; top :',
'', // Index 3, div top position
'Px; left :',
'', // Index 5, div left position
'Px; width :',
'', // Index 7, div width
'Px; Height :',
'', // Index 9, div height
'Px; overflow: hidden;/"> '', // Index 11, IMG URL
'/"Width = /"',
'', // Index 13, IMG width
'/"Height = /"',
'', // Index 15, IMG height
'/"Alt = /"',
'', // Index 17, IMG alt text
'/"> <// Div>'
];