与MySQL函数SUBSTRING_INDEX()等效的JavaScript [英] JavaScript equivalent of the MySQL function SUBSTRING_INDEX()

问题描述

SUBSTRING_INDEX() 返回指定次数的定界符之前的字符串中的子字符串.

SUBSTRING_INDEX() in MySQL returns a substring from a string before the specified number of occurrences of the delimiter.

JavaScript中是否有任何等效功能?我需要执行相同的操作..但要对JavaScript中的字符串值执行

Is there any equivalent function in JavaScript? I need to perform the same thing.. but on a string value in JavaScript.

推荐答案

MySQL:

SELECT SUBSTRING_INDEX('www.stackoverflow.com', '.', 1) result;
+--------+
| result |
+--------+
| www    |
+--------+
1 row in set (0.00 sec)

SELECT SUBSTRING_INDEX('www.stackoverflow.com', '.', 2) result;
+-------------------+
| result            |
+-------------------+
| www.stackoverflow |
+-------------------+
1 row in set (0.00 sec)

JavaScript:

JavaScript:

function substringIndex (input, delimiter, index) {
  var arr = input.split(delimiter);
  arr.splice(index, arr.length - index);
  return arr.join(delimiter);
}

console.log(substringIndex('www.stackoverflow.com', '.', 1)); 
// www

console.log(substringIndex('www.stackoverflow.com', '.', 2)); 
// www.stackoverflow

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