JS - 從另一個數組填充數組+修改值

Question

可能有人請幫我做的JavaScript如下：

• 我有一個數組（數組1）包含字符串
• 我通過每一個需要循環然後我需要得到array1中每個索引的值，然後給每個值添加一個字母
• ，最後將每個索引的修改值從array1寫入到array2中。

謝謝。

Answer 1

//declares the array and initializes it with strings 
var array1 = ["one", "two", "three", "four"]; 

//declares the second array 
var array2 = []; 

//this line begins the loop. Everything inside the { } will run once for every single item inside array1 
for (var i = 0; i < array1.length; i++) 
{ 
    //this gets the contents of the array at each interval 
    var string = array1[i]; 

    //here we take the original string from the array1 and add a letter to it. 
    var combo = string + "A"; 

    //this line takes the new string and puts it into the 2nd array 
    array2.push(combo); 
} 

//displays a message box that shows the contents of the 2nd array 
alert(array2); 

Answer 2

使用Array.map的示例。

var singularArray = ['Dog', 'Cat', 'Bird'], 
pluralArray = singularArray.map(function(value){ 
    return value+'s'; 
}); 

console.log(pluralArray); //Logs ['Dogs', 'Cats', 'Birds'] 

http://jsfiddle.net/fzakf/

詳見https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/map。