对于段落标记数组，如何使用JavaScript将文本字符串截断为以省略号结尾的多个字符

function truncateText(text, maxLength) {
  // 假设段落标记数组为 paragraphMarkers
  var paragraphMarkers = [...];
  
  // 分割文本字符串为段落数组
  var paragraphs = text.split(paragraphMarkers);
  
  // 遍历段落数组
  for (var i = 0; i < paragraphs.length; i++) {
    var paragraph = paragraphs[i];
    
    // 判断段落长度是否超过所需的字符数
    if (paragraph.length > maxLength) {
      // 截断段落并添加省略号
      var truncatedParagraph = paragraph.slice(0, maxLength) + '...';
      
      // 替换原始段落
      paragraphs[i] = truncatedParagraph;
    }
  }
  
  // 合并段落数组为文本字符串
  var truncatedText = paragraphs.join('');
  
  return truncatedText;
}

// 示例用法
var text = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed euismod...';
var maxLength = 20;
var truncatedText = truncateText(text, maxLength);
console.log(truncatedText);