在javascript中插入最後2個字符之前

Question

如何在單詞的最後2個字符之前插入%？

例如：

var str = "Because"; 

輸出：

Becau%se 

Answer 1

如何

var str = "Because"; 
var len = str.length; 
var x = str.substring(0, len-2) + "%" + str.substring(len-2); 

希望這有助於。

Answer 2

str.substring(0, str.length - 2) + "%" + str.substring(str.length - 2) 

Answer 3

嘗試使用這樣的：

str.substring(0,str.length-2)+"%"+str.substring(str.length-2) 

Answer 4

試試這個

var str = "Because"; 
var result = str.slice(0, -2) +"%"+str.slice(-2); 

Answer 5

嘗試

function insert(str, value, position){ 

    return str.substring(0,str.length-position) + value + str.substring(str.length-position); 
} 

Answer 6

這是我寫的爲你做它的功能！

var MyString = "Because"; 

// Inserts a string into another string at a given point 
function InsertString(OriginalString, InsertingString, Position) { 
    return OriginalString.substring(0, Position) + InsertingString + OriginalString.substring(Position, OriginalString.length); 
} 

// You can call this as well if you want it n positions from right 
function InsertStringFromRight(OriginalString, InsertingString, CharsFromRight) { 
    return InsertString(OriginalString, InsertingString, OriginalString.length - CharsFromRight); 
} 

// Call the function! 
var Test1 = InsertString(MyString , "#", 5); 
var Test2 = InsertStringFromRight(MyString , "#", 2); 

alert(Test1); 
alert(Test2); 

Answer 7

在這裏你走！ :)

http://jsfiddle.net/6WNk8/

Answer 8

或者......

var str = "Because", 
    chars = str.split(''); 

chars.splice(-2, 0, '%'); 
str = chars.join(''); 

jsFiddle。