有没有一个函数可以通过一定的百分比差异来查找网页中的字符串

function findSimilarStrings(targetString, webpageString, similarityThreshold) {
  var targetLength = targetString.length;
  var webpageLength = webpageString.length;
  var maxDistance = Math.floor(targetLength * (1 - similarityThreshold));

  var matrix = [];
  for (var i = 0; i <= targetLength; i++) {
    matrix[i] = [i];
  }
  for (var j = 0; j <= webpageLength; j++) {
    matrix[0][j] = j;
  }

  for (var i = 1; i <= targetLength; i++) {
    for (var j = 1; j <= webpageLength; j++) {
      if (targetString[i - 1] === webpageString[j - 1]) {
        matrix[i][j] = matrix[i - 1][j - 1];
      } else {
        matrix[i][j] = Math.min(
          matrix[i - 1][j - 1] + 1, // 替换操作
          matrix[i][j - 1] + 1,     // 插入操作
          matrix[i - 1][j] + 1      // 删除操作
        );
      }
    }
  }

  var similarStrings = [];
  for (var j = 1; j <= webpageLength; j++) {
    if (matrix[targetLength][j] <= maxDistance) {
      similarStrings.push(webpageString.substring(j - targetLength, j));
    }
  }

  return similarStrings;
}

var targetString = "example";
var webpageString = "This is an example string.";
var similarityThreshold = 0.8;
var similarStrings = findSimilarStrings(targetString, webpageString, similarityThreshold);
console.log(similarStrings);