The split() method separates an original string into an array of substrings, based on a separator string that you pass as input. The original string is not altered by split().

split()方法根据您作为输入传递的separator字符串，将原始字符串分成子字符串数组。 原始字符串不会被split()更改。

句法 (Syntax)

const splitStr = str.split(separator, limit);

• separator - a string indicating where each split should occur

  separator -一个字符串，指示每个拆分应该在哪里发生

• limit - a number for the amount of splits to be found

  limit -要找到的分割数量的数字

例子： (Examples:)

const str = "Hello. I am a string. You can separate me.";
const splitStr = str.split("."); // Will separate str on each period characterconsole.log(splitStr); // [ "Hello", " I am a string", " You can separate me", "" ]
console.log(str); // "Hello. I am a string. You can separate me."

Since we used the period (.) as the separator string, the strings in the output array do not contain the period in them – the output separated strings do not include the input separator itself.

由于我们使用句点( . )作为separator字符串，因此输出数组中的字符串不包含句点-输出分隔的字符串不包含输入separator本身。

You can operate on strings directly, without storing them as variables:

您可以直接对字符串进行操作，而无需将它们存储为变量：

"Hello... I am another string... keep on learning!".split("..."); // [ "Hello", " I am another string", " keep on learning!" ]

Also, string separator does not have to be a single character, it can be any combination of characters:

另外，字符串分隔符不必是单个字符，它可以是字符的任意组合：

const names = "Kratos- Atreus- Freya- Hela- Thor- Odin";
const namesArr = names.split("- "); // Notice that the separator is a dash and a space
const firstThreeNames = names.split("- ", 3);console.log(namesArr) // [ "Kratos", "Atreus", "Freya", "Hela", "Thor", "Odin" ]
console.log(firstThreeNames); // [ "Kratos", "Atreus", "Freya" ]

split常见用途 (Common Uses of split)

The split() method is very useful once you grasp the basics. Here are a few common use cases for split():

一旦掌握了基础知识， split()方法就非常有用。 这是split()的一些常见用例：

根据句子创建单词数组： (Create an array of words from a sentence:)

const sentence = "Ladies and gentlemen we are floating in space.";
const words = sentence.split(" "); // Split the sentence on each space between wordsconsole.log(words); // [ "Ladies", "and", "gentlemen", "we", "are", "floating", "in", "space." ]

在单词中创建字母数组： (Create an array of letters in a word:)

const word = "space";
const letters = word.split("");console.log(letters); // [ "s", "p", "a", "c", "e" ]

反转单词中的字母： (Reversing the letters in a word:)

Because the split() method returns an array, it can be combined with array methods like reverse() and join():

因为split()方法返回一个数组，所以它可以与诸如reverse()和join()类的数组方法结合使用：

const word = "float";
const reversedWord = word.split("").reverse().join("");console.log(reversedWord); // "taolf"

That's all you need to know to split() strings with the best of 'em!

这就是您最好了解的用em split()字符串的全部！

翻译自: https://www.freecodecamp.org/news/the-ultimate-guide-to-javascript-string-methods-split/