我希望你能担任高级前端开发员。出一道复杂的js编程题并给出答案

题目：实现一个函数，接受一个字符串作为参数，返回出现次数最多的单词及其出现次数，忽略大小写和标点符号。

例如：

输入："The cat in the hat, hat, hat." 输出：{word: "hat", count: 3}

输入："Hello World! Hello, hello, world." 输出：{word: "hello", count: 3}

答案：

function findMostFrequentWord(str) { // 将字符串转换为小写，并且去掉标点符号 const words = str.toLowerCase().replace(/[^\w\s]/g, '').split(' '); // 定义一个对象，用于存储单词出现的次数 const wordCount = {}; // 循环遍历单词数组，统计每个单词出现的次数 words.forEach(word => { if (word in wordCount) { wordCount[word]++; } else { wordCount[word] = 1; } }); // 定义一个变量，用于存储出现次数最多的单词及其出现次数 let mostFrequentWord = {word: '', count: 0}; // 循环遍历单词计数对象，找出出现次数最多的单词 Object.keys(wordCount).forEach(word => { if (wordCount[word] > mostFrequentWord.count) { mostFrequentWord.word = word; mostFrequentWord.count = wordCount[word]; } }); return mostFrequentWord; }

console.log(findMostFrequentWord('The cat in the hat, hat, hat.')); // {word: "hat", count: 3} console.log(findMostFrequentWord('Hello World! Hello, hello, world.')); // {word: "hello", count: 3}