如何在JavaScript中拆分值

Question

I have to split the values using JavaScript and want to find the last occuring slash / from a string and replace the contents after the last slash / For example:

var word = "www.abc/def/ghf/ijk/**default.aspx**";

should become

var word ="www.abc/def/ghf/ijk/**replacement**";

The number of slashes may vary each time.

Answer 1

尝试使用regexp：

"www.abc/def/ghf/ijk/default.aspx".replace(/\/[^\/]+$/, "/replacement");

Answer 2

An alternative without regular expression (I just remembered lastIndexOf() method)

var word = "www.abc/def/ghf/ijk/default.aspx";
word = word.substring(0, word.lastIndexOf("/")) + "/replacement";

Answer 3

You can array split on '/', then pop the last element off the array, and rejoin.

word = word.split('/');
word.pop();
word = word.join('/') + replacement;

Answer 4

What about using a combination of the join() and split() functions?

var word = "www.abc/def/ghf/ijk/default.aspx";

// split the word using a `/` as a delimiter
wordParts = word.split('/'); 

// replace the last element of the array
wordParts[wordParts.length-1] = 'replacement';

// join the array back to a string.
var finalWord = wordParts.join('/');

The number of slashes doesn't matter here because all that is done is to split the string at every instance of the delimiter (in this case a slash).

Here is a working demo

Answer 5

How about the KISS principle?

var word = "www.abc/def/ghf/ijk/default.aspx";
word = word.substring(0, word.lastIndexOf("/")) + "/replacement";

Answer 6

Use regexp or arrays, something like:

[].splice.call(word = word.split('/'), -1, 1, 'replacement');
word = word.join('/');