数组中的计数结果

var choiceCounts = {};
for (var iLoop=0; iLoop < aChoices.length; iLoop++) {
  var keyChoice = aChoices[iLoop];
  if (!choiceCounts[keyChoice]) {
    choiceCounts[keyChoice] = 1;
  } else {
    choiceCounts[keyChoice]++;
  } //if
} //for

然后,您将拥有一个属性等于该属性在数组中存在的次数的对象。

不是100%确定你在找什么,但我想就是这个。

  // Original data
    var choices = [
        "choice 1",
        "choice 1",
        "choice 2",
        "choice 3",
        "choice 3",
        "choice 3",
        "choice 3",
        "choice 3",
        "choice 3",
        "choice 4",
        "choice 4",
        "choice 4"];


    //Create the results array
    var result = new Object();

    for (var choice in choices) {
        if (result[choices[choice]] === undefined)
            result[choices[choice]] = 1;
        else
            result[choices[choice]]++;
    }

    //Print result
    var str = "";

    for (var item in result)
        str += item + ": " + result[item] + "<br />";


    document.getElementById("resultDiv").innerHTML = str;

输出:

choice 1: 2
choice 2: 1
choice 3: 6
choice 4: 3