Instructions for using the path.extname method in node.js_node.js

Method description:

Returns the path file extension. If the path ends with '.', '.' will be returned. If there is no extension and does not end with '.', a null value will be returned.

Grammar:

Copy code The code is as follows:

path.extname(p)

Since this method belongs to the path module, the path module needs to be introduced before use (var path= require(“path”) )

Receive parameters:

p path

Example:

Copy code The code is as follows:

path.extname('index.html')
// returns
'.html'
path.extname('index.')
// returns
'.'
path.extname('index')
// returns
''

Source code:

Copy code The code is as follows:

exports.extname = function(path) {
Return splitPath(path)[3];
};