JQuery--Filter usage

Use the filter function to filter the qualified DOM elements from the wrapper set.

If we have an HTML file with the following content, to get the <a> elements of the class external, using filter can be easily done.

<a href= "#" class= "external" >link</a><a href= "#" class= "external" >link</a><a href= "#" >link</a><a href= "#" class= "external" >link</a><a href= "#" class= "external" >link</a ><a href= "#" ></a><a href= "#" >link</a><a href= "#" >link</a><a href= "#" > Link</a><a href= "#" >link</a>

The parameter types of filter can be divided into two kinds:

1 Pass Selector

2 Pass Filter function

If the selector is used as a parameter, use the following

$ (' a '). Filter ('. External ')

Using anonymous filtering functions

$ (' a '). Filter (function (index) {return $ (this). Hasclass (' external ');})

The parameter is the subscript index for the result set.