How to intercept a string with split

The split() method in JavaScript is used to split a string into substrings. To intercept a string, you can use the substr() method and substring() method: 1. string.substr(start, length), use Used to intercept a substring of specified length from a string; 2. string.substring(start, end), string is the string to be intercepted, and start and end are both 0-based indexes.

#In JavaScript, the split() method is also used to split a string into substrings and return an array composed of substrings. If you need to intercept part of a string, you can use the substr() or substring() methods of JavaScript strings.

The substr() method is used to intercept a substring of specified length from a string. Its syntax is as follows:

string.substr(start, length)

Among them, string is the string to be intercepted, and start is the starting position. Indicates the position from which to intercept the substring. length is an optional parameter, indicating the length of the substring to be intercepted.

The following are some examples:

const text = "Hello, world!";
// 截取"Hello"子串
const part1 = text.substr(0, 5);  // 从索引0开始，截取5个字符
console.log(part1);  // 输出: 'Hello'
// 截取"world!"子串
const part2 = text.substr(7);  // 从索引7开始，截取到字符串末尾
console.log(part2);  // 输出: 'world!'
// 截取"ello"子串
const part3 = text.substr(1, 4);  // 从索引1开始，截取4个字符
console.log(part3);  // 输出: 'ello'

In addition, the substring() method can also be used to intercept part of the string. The syntax is as follows:

string.substring(start, end)

Among them, string is the For the intercepted string, start and end are both 0-based indexes, indicating the starting and ending positions of the substring to be intercepted (excluding the ending position itself).

The following are some examples:

const text = "Hello, world!";
// 截取"Hello"子串
const part1 = text.substring(0, 5);  // 从索引0开始，直到索引4（不包括5）
console.log(part1);  // 输出: 'Hello'
// 截取"world!"子串
const part2 = text.substring(7);  // 从索引7开始，直到字符串末尾
console.log(part2);  // 输出: 'world!'
// 截取"ello"子串
const part3 = text.substring(1, 5);  // 从索引1开始，直到索引4（不包括5）
console.log(part3);  // 输出: 'ello'

It should be noted that the substr() method and the substring() method have different parameters. When using them, you need to choose the appropriate method according to the specific situation.

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