JQuery prototype properties and methods for jQuery learning notes

jQuery.fn = jQuery.prototype = {
     constructor: jQuery,
     init: function( selector, context, rootjQuery ) { }, 
    selector: "",        
    jquery: "1.7.2",        
    length: 0,        
    size: function() {},
    toArray: function() {},        
    get: function( num ) {},       
    pushStack: function( elems, name, selector ) {},       
    each: function( callback, args ) {},
    ready: function( fn ) { },
    eq: function( i ) {},
    first: function() {},
    last: function() { },
    slice: function() {},
    map: function( callback ) { },
    end: function() { },       
    push: push,
    sort: [].sort,
    splice: [].splice
        };

These are some of the properties and methods on the prototype of this version of jQuery.
Selector: the selector used to record init arguments. But not necessarily equal.
$(" div "). The selector; / / "div"
$(" div "). The find (p). Selecctor; / / "div p";
This property is generally used for debugging.
Jquery: the version number of jquery.
Length: the number of elements.
Size (): equivalent to length, which has less memory overhead.
The remaining members are described in a later section.