计算每个字符的出现 [英] Count appearance of each character

问题描述

我目前正在使用密码强度计算器，然后我需要知道一个字符是否出现多次.
我知道我必须像这样occurance = password.match(/a/g).length使用regex来多次出现a，但是我想对每个字符(字母，数字，符号)执行此操作.

I'm currently working on a password strength calculator and then I need to know if a character appears more than once.
I know I must use regex like this occurance = password.match(/a/g).length to get ho many times a occurs, but I want to do that with each character (letter, number, symbol).

除了使用包含我要测试的所有字符的数组之外，是否可以使用JS/JQuery(也许是正则表达式)来做到这一点?

Is there a way to do that using JS / JQuery, maybe regex, other than working with an array which contains all characters I want to test ?

推荐答案

像这样吗?

var hello = "Hello world";
var histogram = {};

for (var i = 0, len = hello.length; i < len; i++) {
    var letter = hello[i];
    histogram[letter] = (histogram[letter] || 0) + 1;
}

console.log(histogram);

结果:

{ H: 1, e: 1, l: 3, o: 2, ' ': 1, w: 1, r: 1, d: 1 }

或者您可以使用数组.只需将{}更改为[].

Or you may use array. Just change {} to [].

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