jQuery计数数组中的出现次数 [英] Jquery Count number of occurances in array

问题描述

我想计算数组中每个元素的数量

I'd like to count the number of each element in my array

示例:

 var basketItems = ['1','3','1','4','4'];

 jQuery.each(basketItems, function(key,value) {

 // Go through each element and tell me how many times it occurs, output this and remove duplicates

 }

然后我想输出

Item  |  Occurances
--------------------
1     |  2
3     |  1
4     |  2

预先感谢

推荐答案

您可以尝试:

var basketItems = ['1','3','1','4','4'],
    counts = {};

jQuery.each(basketItems, function(key,value) {
  if (!counts.hasOwnProperty(value)) {
    counts[value] = 1;
  } else {
    counts[value]++;
  }
});

结果:

Object {1: 2, 3: 1, 4: 2}

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