在jquery中用連字符分割字符串後獲取最後一個值？

Question

大家好，我將有一個字符串，在連字符隔開，我想獲得字符串的lastIndex，並與新的價值

var str1="New-New_Folder"; //Replace New_Folder with Folder so that the str becomes 
    var newstr1="New-Folder"; 


    var str2="New-New_Folder-New_Folder"; //Replace the last New_Folder with Sub_Folder so that the str becomes 
    var newstr2="New-New_Folder-Sub_Folder"; 

更換任何一個可以幫助我在這裏？

Answer 1

您可以使用拆分，然後獲得與長度減一的最後一個索引：

var string = "some-hyphen-string"; 
var parts = string.split("-"); 
var lastPart = parts[parts.length - 1]; //lastPart is now the final index string split 

演示：http://jsfiddle.net/ACfRU/

Answer 2

我不得不承認，這是很清楚，但可能與tymeJV的答案和我的你可以想出適合您需求的解決方案。

var str1="New-New_Folder"; 
var newstr2 = replaceLast(str1, "Sub_Folder"); 

alert(newstr2); 

function replaceLast(strWhat, strWith) { 
    strWhat = strWhat.split("-"); 
    strWhat[strWhat.length - 1] = strWith; 
    strWhat = strWhat.join("-"); 
    return strWhat; 
} 

的jsfiddle：http://jsfiddle.net/FF96g/

Answer 3

使用字符串函數：

var str1 = "New-New_Folder"; 
var newstr1 = str1.substring(0, str1.lastIndexOf("-")+1) + "Folder";