Javascript中的单词统计

function wordCount(text) {
  // 分割文本并转换为小写
  var words = text.toLowerCase().split(/\W+/);
  
  // 统计单词
  var wordCountMap = {};
  for (var i = 0; i < words.length; i++) {
    var word = words[i];
    if (word !== "") {
      if (wordCountMap[word]) {
        wordCountMap[word]++;
      } else {
        wordCountMap[word] = 1;
      }
    }
  }
  
  // 过滤停用词
  var stopWords = ["a", "an", "the"];
  for (var i = 0; i < stopWords.length; i++) {
    delete wordCountMap[stopWords[i]];
  }
  
  // 排序结果
  var sortedWords = Object.keys(wordCountMap).sort(function(a, b) {
    return wordCountMap[b] - wordCountMap[a];
  });
  
  // 输出结果
  for (var i = 0; i < sortedWords.length; i++) {
    var word = sortedWords[i];
    var count = wordCountMap[word];
    console.log(word + ": " + count);
  }
}

// 示例用法
var text = "This is a sample text. It contains some words. This is a sample text.";
wordCount(text);