Array-like operations in jQuery objects_jquery

Look at what available methods our jQuery provides us with:
Size(): Obviously, it should return the number of elements in the packed set, such as $('a').size() Indicates the number of link elements;
Get(index): When index is not specified, all elements in the packaging set will be taken by default and returned in the form of an array in js. If index is specified, the subscript corresponding to index will be returned. Element, such as $('img[title]').get(0) returns the first img element containing the attribute title, which is also equivalent to $('img[title]')[0];
index (elem): Returns the subscript of the element elem in the packaging set, if the element is not found, returns -1;
　add(String|elem|Array): Adds the element in the parameter to the packaging set, if the parameter is jQuery selector, then all matching objects will be added to the collection. If it is an html element, the element array obtained through the clean method will be added to the collection. If it is a dom element or an array of dom elements, then it will be added directly to the collection. ; note that what is returned is the added package set; for example, $('img[alt]','img[title]') is equivalent to $('img[alt]').add('img[title]' ) that returns the img element containing the alt attribute or the img element containing the title attribute;
Not (String|elem|Array): Delete the elements that meet the parameter conditions in the packaging set. Note that the parameter can only be a filter expression. That is, expressions starting with "[" or ":", such as $('img[title]').not('title*=puy'), return img elements containing title attributes, and the title attributes of these elements are Contains puy text; returns the filtered packaging set;
Filter(String|function): If the incoming parameter is of String type, then the expression must also be a filtering expression, used to select from the packaging set Delete all elements that do not match the selector; if a function is passed in, then this function will be called for each element in the packaging set. If this function returns false, the element will be deleted from the packaging set. In the function, you can Use the this keyword to call the element that calls the method in the packaging set at that time; such as $('td').filter(function(){return this.innerHTML.match(/^"d $/)}) returns all td elements whose contents in td are numbers;
slice(begin,end): Create and return a new packaging set, which is a continuous part of the original packaging set, and the first of the new packaging set The first element is the element at the begin position of the original packaging set, and the last element is the element before the element at the end position. Of course, end does not need to be specified, then it will extend to the end of the original packaging set; such as $('*').slice (2,3) This statement selects all elements on the page, and then saves a new packaging set containing the third element of the original packaging set. Note that this $('*').get(2) is different, this returns the element , and the slice method returns a packaging set, thus having the operation of packaging set;
Childen(): Returns a new packaging set composed of all different sub-elements of the original packaging set element (excluding text nodes), such as $( 'div').children() returns a new packaging set composed of child elements under all div elements; if a parameter is specified, the parameter is also a filter expression;
Contents(): Returns the contents of the original packaging set element New packaging set (can contain text nodes); note that this method cannot accept parameters for filtering;
Next(): Returns a new packaging set composed of all unique next sibling elements of the original packaging set element; if parameters are specified , then this parameter is also a filter expression; for example, $('div#someDiv').next() returns a packaging set containing the next sibling element of the div element with the id someDiv; if a parameter is specified, then this parameter is also a filter expression Formula;
NextAll(): Returns a new packaging set that contains all subsequent siblings of the original packaging set element; such as $('div#someDiv').nextAll() returns a new packaging set that contains the subsequent siblings of the div element with the id of someDiv New packaging set; if a parameter is specified, then this parameter is also a filter expression;
parent(): Returns a new packaging set of the only direct parent element of all elements in the original packaging set; if a parameter is specified, then this parameter is also a filter expression Expression;
parents(): Returns a new packaging set of ancestor elements of all elements in the original packaging set; if a parameter is specified, the parameter is also a filter expression;
prev(): Returns the original packaging set elements A new wrapper set consisting of all unique previous sibling elements; if a parameter is specified, the parameter is also a filter expression;

prevAll(): Returns a new wrapper containing all previous sibling elements of the original wrapper set element Set; if a parameter is specified, then this parameter is also a filter expression;
siblings(): Returns a new packaging set composed of all unique sibling elements in the original packaging set element; if a parameter is specified, then this parameter is also Filter expression;
Find(String): Returns a new packaging set containing all elements in the original packaging set that match the passed selector expression, and the descendants of the elements in the original packaging set will also be passed into the new packaging set The packaging set;
contains(text): Returns a new packaging set composed of elements containing the text string passed in the text parameter;
is(String): If the packaging set contains String matching elements, then Returns true, otherwise returns false;
clone(copyHandle): If the parameter passed in is true, the event will be copied together, otherwise the event will not be copied and a new packaging set will be formed;
end(): In Called within the jQuery command chain to return to the previous packaging set;
andSelf(): merge the two recently generated packaging sets within the command chain;
The operations on packaging elements are summarized here, if something is wrong Please point it out for everyone’s reference and study.