javascript - JS - 从另一个数组填充一个数组+修改值

Question

有人可以帮我用 JavaScript 做以下事情：

• 我有一个包含字符串的数组（array1）
• 我需要遍历初始数组（array1）的每个元素
• 然后我需要获取array1中每个索引的值，并为每个值添加一个字母
• 最后将array1中每个索引的修改值写入array2。

谢谢你。

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/

有关详细信息，请参阅https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/map。