JavaScript:字符在字符串中出现多少次?

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有没有一种简单的方法可以检查字符在字符串中出现多少次?

Is there a simple way to check how many times a character appears in a String?

推荐答案

您可以删除字符串中的任何其他字符并检查其长度:

You could remove any other character in the string and check the length:

str.replace(/[^a]/g, "").length

在这里计算 str 中有多少 a 个. RegExp 如下所述:

Here it is counted how many as are in str. The RegExp is described below:

[ // Start Character Group ^ // Not operator in character group a // The character "a" ] // End character group