根据字典数组中的常用关键字查找比率

function findKeywordRatio(dictionary, keyword) {
  let count = 0;
  for (let i = 0; i < dictionary.length; i++) {
    if (dictionary[i] === keyword) {
      count++;
    }
  }
  return count / dictionary.length;
}

// 示例用法
const dictionary = ["apple", "banana", "apple", "orange", "grape"];
const keyword = "apple";
const ratio = findKeywordRatio(dictionary, keyword);
console.log(`关键字 "${keyword}" 在字典数组中的比率为: ${ratio}`);