代码：

Question

let num = prompt("enter a number");
let foo = num.split("").map(item => parseInt(item, 10));
let fig = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
let arr = [
  "zero",
  "one",
  "two",
  "three",
  "four",
  "five",
  "six",
  "seven",
  "eight",
  "nine"
];
fig[0] = arr[0];
fig[1] = arr[1];
fig[2] = arr[2];
// let filteredNum = foo.filter(number => fig.includes(number));
// console.log(filteredNum);
// console.log(fig[0]);
// console.log(fig[1]);
// console.log(fig[2]);

我需要帮助，我有一组数字（0 - 9）。我提示用户输入一个数字，这样当用户输入1时，它打印出一个字符串'one'，如果用户输入34，则打印出三个字符串。

Answer 1

您可以尝试以下

let num = prompt("enter a number");
let foo = num.split("").map(item => parseInt(item, 10));

let arr = ["zero","one","two","three","four","five","six","seven","eight","nine"];

console.log(foo.reduce((a,c) => a + " " + arr[c], ""));

请注意，不需要fig，因为您已经有arr的索引来匹配字符串的数值

Answer 2

您可以将您的数字转换为字符串并将对象用作字典：

const num = prompt("enter a number");
const dict = {
  "0": "zero",
  "1": "one",
  "2": "two",
  "3": "three",
  "4": "four",
  "5": "five",
  "6": "six",
  "7": "seven",
  "8": "eight",
  "9": "nine"
}
const res = `${num}`.split('').map(e => dict[e]).join(' ');
console.log(res);

Answer 3

我认为这里不需要reducer。这是一个简单的逻辑，也可以使用一个简单的循环来实现。

let num = prompt("enter a number");
let foo = num.split("").map(item => parseInt(item, 10));

let arr = ["zero","one","two","three","four","five","six","seven","eight","nine"];

var inputStr = '';
foo.forEach((num)=>{
  inputStr +=  arr[num] + ' ';
});
console.log(inputStr);

或者您甚至可以使用这样的单线：

let num = prompt("enter a number");
let arr = ["zero","one","two","three","four","five","six","seven","eight","nine"];

let foo = num.split("").map(item => arr[parseInt(item, 10)]).join(' ');

console.log(foo);

Answer 4

您可以使用Array.from获取单个数字（字符串作为可迭代）并映射该字词（如果存在）。如果没有取值。

稍后用空格加入数组。

＆＃13;

var numbers = prompt("enter a number"),
    array = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];

console.log(Array.from(numbers, i => array[i] || i).join(' '));

＆＃13;

Answer 5

您需要检查字符串是否为数字？

const num = prompt("enter a number");

const arr = [ "zero", "one", "two", "three", "four",
            "five", "six", "seven", "eight", "nine" ];

let foo = [];

if(!isNaN(num)) {
  foo = num.split('').map(n => arr[n]).join(' ');
}

console.log(foo);

Answer 6

代码：

console.log(prompt("enter a number").split``.map(_ => ~~_).reduce((_, i) => `${_} ${"zero one two three four five six seven eight nine".split` `[i]}`, ``));

方法：

这使用map和reduce

说明：

console.log(                /*begin console.log*/
    prompt(                 /*take input*/
        'enter a number'.   /*input text*/
            split``.        /*split at every single char*/
            map(            /*map over all elements of the array*/
                _ => ~~_).  /*convert to number and reduce to integer*/
                reduce(     /*begin reducing the array to one value*/
                    (_,i)=> /*parameters*/
                    `${_} ${'zero one two three four five six seven eight nine'.split` `[i]}`
                , ''))
// the last part writes value of _ and then creates a string (0-9) and splits at 
//space and then selects the value depending on i

当用户输入数字时，如何在JavaScript中将数字转换为字符串

6 个答案:

代码：

方法：

说明：