从路径中删除最后一个文件夹

Question

var loc = window.location.pathname;
var dir = loc.substring(0, loc.lastIndexOf('/'));

loc returns as:

/public/html/signup/

dir returns as:

/public/html/signup

I want to remove the name of the folder too so i get back:

/public/html/

What am I doing wrong? Thanks!

Answer 1

Here you go. It's a universal solution so that you can strip as many folders as you want to - just pass something else than 1.

var path = window.location.pathname.split("/");
var strippedPath = path.slice(0, path.length-1).join("/");

Answer 2

There is only one javascript native method that I know that remove an array element and return a deep copy of this modified list. I could mention also reduce but this is out the scope here.

const new_path = path.split('/').filter((basename, index, array) => index !== array.length - (basename === '' ? 2 : 1)).join('/');

Filter is cool since it helps us to sort out basenames that are empties in a callback, equivalent to a spitted trailing slash within the path in our case.