JS or jquery How to get parent, child, sibling elements (including ancestor, grandchild, etc.)

Native JavaScript methods:

var a = document.getElementById ("Dom");      Del_space (a); Clean space      var b = a.childnodes;//Get all the child nodes of A;      var c = a.parentnode;//get parent node of A;      var d = a.nextsibling;//Get the next sibling section of a Point      var e = a.previoussibling;//Get the previous sibling of a      var f = a.firstchild;//Get the first child node of a      var g = a.lastchild;//Get the last child of a Node

　　

jquery Method:

Jquery.parent (expr)//To find a Father node, you can pass in expr for filtering, such as $ ("span"). Parent () or $ ("span"). Parent (". Class")jquery.parents (expr)//similar to jquery.parents (expr), but finds all ancestor elements, not limited to parent elementsJquery.children (expr)//returns all child nodes, this method only returns the immediate child node and does not return all descendant nodesjquery.contents ()//returns all content, including nodes and text, below. The difference between this method and children () is that, including blank text, it will be returned as a jquery object, and children () will only return the nodeJquery.prev ()//return to the previous sibling node, not all sibling nodesJquery.prevall ()//return all previous sibling nodesJquery.next ()//returns the next sibling node, not all sibling nodesJquery.nextall ()//return all subsequent sibling nodesjquery.siblings ()//back to sibling nodes, no pointsjquery.find (expr)//is completely different from jquery.filter (expr). Jquery.filter () is a partial filter from the initial set of JQuery objects, and the returned result of Jquery.find () does not have the contents of the initial collection, such as $ ("P"), Find ("span"), which is the start of the P element, equivalent to $ ("p Span ").

JS or jquery How to get parent, child, sibling elements (including ancestor, grandchild, etc.)