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js 字符串数组和数字数组互转

 2 years ago
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今天使用 FormItem 组件时从 initialValue 中发现 "1,2,3"这样的字符串经过 split 操作后得到的结果是字符串数组。

const str = '1,2,3';
const arr = str.split(',');
console.log('arr', arr);

打印出来的结果是：

(3) ["1", "2", "3"]
0: "1"
1: "2"
2: "3"
length: 3

那么如何把字符串数组转换成 number 数组呢

js 把字符串数组转换成 int 型数组

const strArray = ['1','2','3'];
const intArray = strArray.map(Number);
console.log('intArray', intArray);
const strArray = ['1','2','3'];
const intArray = strArray.map((item) => {
return parseInt(item);
console.log('intArray', intArray);

打印出来的效果是：

intArray
(3) [1, 2, 3]

每一项都变成了数字型。

那反过来

js 把数字数组转换为字符串数组

const intArray = [4, 5, 6];
const StringArray = intArray.map(String);
console.log('StringArray', StringArray);

打印出来的结果是：

StringArray
(3) ["4", "5", "6"]
0: "4"
1: "5"
2: "6"
length: 3

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