1. [Basic Algorithm Scripting: Repeat a String Repeat a String | freeCodeCamp.org](https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string)
2. [Three ways to repeat a string in JavaScript](https://www.freecodecamp.org/news/three-ways-to-repeat-a-string-in-javascript-2a9053b93a2d/)

​## 我写的，用了 padEnd()

```js function repeatStringNumTimes(str, num) { if (num <= 0) { return '' } else { return str.padEnd(num * str.length, str) } }

console.log(repeatStringNumTimes('abc', 2)) ```

​## repeat()

```js function repeatStringNumTimes(str, num) { if (num <= 0) { return '' } else { return str.repeat(num) } }

console.log(repeatStringNumTimes('abc', 2)) ```

​## while

```js function repeatStringNumTimes(str, num) { let repeatedStr = '' while (num > 0) { repeatedStr = repeatedStr + str num– } w return repeatedStr }

console.log(repeatStringNumTimes('abc', 2)) ```

​## 递归

```js function repeatStringNumTimes(str, num) { if (num < 0) { return '' } if (num = 1) { return str } else { return str + repeatStringNumTimes(str, num - 1) } }

console.log(repeatStringNumTimes('abc', 20)) ```