The difference between Jquery find and filter functions Description_jquery

find() will look for elements with class classname within the div element.
filter() filters out elements whose class is classname.

Basically, find sub-elements are found, and filter is a level search.

·The find function is to query the sub-elements of the current object collection;
·The filter function is to query the current object collection Filter and use filter conditions to narrow the scope;
·The parameter of the find function is a jQuery selector expression; The parameter of
·filter is also a selector expression, but there can be multiple conditions, separated by commas (logical OR relationship);
·The parameter of filter can also be a function. When calling the function, the index parameter will be automatically passed in. The function needs to return true or false to select or exclude elements.

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>Document</title> <input type="button" value="test-find" id="btn1"> <input type="button" value="test-filter" id="btn2"> <input type="button" value="test-filter" id="btn3"> <input type="button" value="test-filter" id="btn4"> <div class="first"> <span class="test"> </span>first content</div>test content<div class="last"> <span class="test"> </span>last</div>last test content<div class="last"> <span> </span>last</div>last no test content