javascript - 在 javascript 中出现次数最多

Question

您好，我对 JavaScript 的了解非常有限且基础。基本上下面是我会提示一个弹出窗口，显示值的答案。事情来 self 在下面找到的编码如果我必须插入一个数组让我们说 1,2,3,2 输出将是 , 因为它出现次数最多在数组中。有没有办法编辑此代码，以便上面输入的答案为 2

我已经做了相当多的研究:

链接如下:

• Highest occurrence in an array or first selected
• Get the element with the highest occurrence in an array
• https://www.sitepoint.com/community/t/numbers-only-input-values-in-text-box-how/3029

代码:

<script type="text/javascript">
    function evaluate() {
      var input = prompt("Please enter your input");
      var array = new Array();

     function mode(array)
{
    if(array.length == 0)
        return null;
    var modeMap = {};
    var maxEl = array[0], maxCount = 1;
    for(var i = 0; i < array.length; i++)
    {
        var el = array[i];
        if(modeMap[el] == null)
            modeMap[el] = 1;
        else
            modeMap[el]++;  
        if(modeMap[el] > maxCount)
        {
            maxEl = el;
            maxCount = modeMap[el];
        }
    }
    return maxEl;
}
      document.writeln("Your calculation is: ");
      document.writeln(mode(input) + " with a starting input string of: " + input);

    }
  </script>
      <script type="text/javascript">
    evaluate();
  </script>

Answer 1

您想先将字符串'1,2,3,2' 转换为数组[ 1, 2, 3, 2 ]。这可以通过 split 来完成功能。你可能还想 trim每个元素以防有人用空格格式化它们。

function evaluate() {
  const input = prompt("Please enter the array of integers")
    .split(',')
    .map(item => item.trim());

  function mode(items) {
    const counts = items
      .reduce((counts, item) => {
        const currentItemCount = counts.get(item) || 0;
        return counts.set(item, currentItemCount + 1);
      }, new Map());
    const maxEntry = Array.from(counts.entries())
      .reduce((maxEntry, entry) => {
        return entry[1] > maxEntry[1] ? entry : maxEntry;
      });
    return maxEntry[0];
  }
  
  document.writeln("Your calculation is: ");
  document.writeln(mode(input) + " with a starting input string of: " + input);
}

evaluate();