在JavaScript中多次重复一个字符串 [英] Repeat a string in JavaScript a number of times

问题描述

在Perl中，我可以使用以下语法多次重复一个字符:

In Perl I can repeat a character multiple times using the syntax:

$a = "a" x 10; // results in "aaaaaaaaaa"

有没有一种简单的方法可以用Javascript完成此操作?我显然可以使用一个函数，但是我想知道是否有任何内置方法或其他一些巧妙的技术.

Is there a simple way to accomplish this in Javascript? I can obviously use a function, but I was wondering if there was any built in approach, or some other clever technique.

推荐答案

这些天来，不在Internet Explorer中.)因此，除非您需要支持较旧的浏览器，否则只需编写以下内容即可:

These days, the repeat string method is implemented almost everywhere. (It is not in Internet Explorer.) So unless you need to support older browsers, you can simply write:

"a".repeat(10)

在repeat之前，我们使用了此技巧:

Before repeat, we used this hack:

Array(11).join("a") // create string with 10 a's: "aaaaaaaaaa"

(请注意，长度为11的数组只会给您10个"a"，因为Array.join将参数放在数组元素之间.)

(Note that an array of length 11 gets you only 10 "a"s, since Array.join puts the argument between the array elements.)

Simon还指出，根据此jsperf ，它在Safari和Chrome中似乎更快(但不是Firefox)，只需使用for循环附加附加字符即可多次重复一个字符(尽管不太简洁).

Simon also points out that according to this jsperf, it appears that it's faster in Safari and Chrome (but not Firefox) to repeat a character multiple times by simply appending using a for loop (although a bit less concise).

这篇关于在JavaScript中多次重复一个字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！