JavaScript split()方法之字符串分割技巧总结

str.split(separator, limit)

const sentence = "The quick brown fox jumps over the lazy dog";
const words = sentence.split(" ");
console.log(words); 
// Output: ["The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"]

const data = "apple,orange;banana|grape";
const fruits = data.split(/[,;|]/);
console.log(fruits);
// Output: ["apple", "orange", "banana", "grape"]

const colors = "red,green,blue,yellow,purple";
const firstTwo = colors.split(",", 2);
console.log(firstTwo);
// Output: ["red", "green"]

const str = ",a,b,c,";
const arr = str.split(",");
console.log(arr);
// Output: ["", "a", "b", "c", ""]

const word = "hello";
const letters = word.split("");
console.log(letters);
// Output: ["h", "e", "l", "l", "o"]

const csv = "  name, age, city \n John, 25, New York \n Jane, 30, London";
const rows = csv.split("\n").map(row => row.trim());
const data = rows.map(row => row.split(",").map(item => item.trim()));
console.log(data);
/* Output: 
[
  ["name", "age", "city"],
  ["John", "25", "New York"],
  ["Jane", "30", "London"]
]
*/

const multilineText = `Line 1
Line 2
Line 3`;
const lines = multilineText.split("\n");
console.log(lines);
// Output: ["Line 1", "Line 2", "Line 3"]

const text = "This is a sample text. This text contains some words.";
const words = text.toLowerCase().split(/\W+/).filter(word => word.length > 0);
const wordCount = {};
words.forEach(word => {
  wordCount[word] = (wordCount[word] || 0) + 1;
});
console.log(wordCount);
/* Output: 
{
  "this": 2,
  "is": 1,
  "a": 1,
  "sample": 1,
  "text": 2,
  "contains": 1,
  "some": 1,
  "words": 1
}
*/

const str = "abc";
console.log(str.split("")); // 通用实现: ["a", "b", "c"]

const withCapture = "a,b,c";
console.log(withCapture.split(/(,)/));
// Output: ["a", ",", "b", ",", "c"]