通过索引 jQuery 获取数组值

Question

我有一个具有以下值的javascript数组，

let arr = ["2","3","4","5","6"];

我有第二个数组，它有三个整数，

let index = [1,3,4];

我将如何使用JQuery(或Javascript(使用数组从arr获取索引，并将其添加到新数组中。我想将这些字符串添加到新数组中。

indexArr = ["3","5","6"]

谢谢

Answer 1

很简单，只需使用Array.prototype.map()：

let arr = ["2","3","4","5","6"];
let index = [1,3,4];
let indexArr = index.map(i => arr[i]);
console.log(indexArr);

Answer 2

你可以用简单的.map来做到这一点

let arr = ["2","3","4","5","6"];
let index = [1,3,4];
index.map(x=>arr[x]) //["3", "5", "6"]

Answer 3

只需使用循环。就个人而言，我更喜欢这种方法而不是map因为我发现这更容易理解，但这是个人喜好。

let arr = ["2","3","4","5","6"];
let index = [1,3,4];
let indexArr = [];
for(var i=0; i<index.length; i++) {
indexArr.push(arr[index[i]]);
}
console.log(indexArr);