Determines whether an element is a child of another element or a parent element

Determines whether an element is a child or parent element of another element:
In practice, it is sometimes judged that an element is a child or parent element of another element, as described in the code example below.

    jquery.fn.ischildof= function (b) {return (this. Parents (b)  ). length>0//jquery.fn.ischildandselfof=function(b) {    return (this. Closest (b). Length>0);}

The above code can achieve our requirements, the code is relatively simple here is not much introduction, if there are any questions can be thread message.
Related reading:
The 1.parents () function can be found in the parents () method section of jquery .
The 2.closest function can be found in the closest () function section of jquery .

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Determines whether an element is a child of another element or a parent element