解决JavaScript动态内容更新中图片元素不刷新的问题

// ... (reviews数据和DOM元素选择器定义) ...

const person = document.querySelector("#person-img"); // 全局变量：图片DOM元素
const author = document.querySelector("#author");
const job = document.querySelector("#job");
const info = document.querySelector("#info");

let number = 0; // 当前评论的索引

// 页面加载时初始化显示第一个评论
window.addEventListener('DOMContentLoaded', function() {
  const item = reviews[number];
  person.src = item.img;
  author.innerHTML = item.name;
  job.innerHTML = item.job;
  info.innerHTML = item.text;
});

// 核心更新函数
function showPerson(person) { // 注意：这里的'person'是函数参数
  const item = reviews[person]; // 'person'在此处被用作数组索引
  person.src = item.img; // 错误：尝试修改函数参数'person'的src属性，而非全局DOM元素'person'
  author.innerHTML = item.name;
  job.innerHTML = item.job;
  info.innerHTML = item.text;
}

// 按钮事件监听器
nextBtn.addEventListener("click", function() {
  number++;
  if(number > reviews.length - 1) {
    number = 0;
  }
  showPerson(number); // 传递当前索引
});

prevBtn.addEventListener("click", function() {
  number--;
  if(number < 0) {
    number = reviews.length - 1;
  }
  showPerson(number); // 传递当前索引
});

randomBtn.addEventListener("click", function() {
  number = Math.floor(Math.random() * reviews.length);
  showPerson(number); // 传递当前索引
});

function showPerson(index) { // 将参数名改为 'index'
  const item = reviews[index]; // 使用新的参数名 'index' 来获取数据
  person.src = item.img; // 现在 'person' 正确地指向了全局的 <img> 元素
  author.innerHTML = item.name;
  job.innerHTML = item.job;
  info.innerHTML = item.text;
}

// local reviews data
const reviews = [
  {
    id: 1,
    name: "susan smith",
    job: "web developer",
    img:
      "https://res.cloudinary.com/diqqf3eq2/image/upload/v1586883334/person-1_rfzshl.jpg",
    text:
      "I'm baby meggings twee health goth +1. Bicycle rights tumeric chartreuse before they sold out chambray pop-up. Shaman humblebrag pickled coloring book salvia hoodie, cold-pressed four dollar toast everyday carry",
  },
  {
    id: 2,
    name: "anna johnson",
    job: "web designer",
    img:
      "https://res.cloudinary.com/diqqf3eq2/image/upload/v1586883409/person-2_np9x5l.jpg",
    text:
      "Helvetica artisan kinfolk thundercats lumbersexual blue bottle. Disrupt glossier gastropub deep v vice franzen hell of brooklyn twee enamel pin fashion axe.photo booth jean shorts artisan narwhal.",
  },
  {
    id: 3,
    name: "peter jones",
    job: "intern",
    img:
      "https://res.cloudinary.com/diqqf3eq2/image/upload/v1586883417/person-3_ipa0mj.jpg",
    text:
      "Sriracha literally flexitarian irony, vape marfa unicorn. Glossier tattooed 8-bit, fixie waistcoat offal activated charcoal slow-carb marfa hell of pabst raclette post-ironic jianbing swag.",
  },
  {
    id: 4,
    name: "bill anderson",
    job: "the boss",
    img:
      "https://res.cloudinary.com/diqqf3eq2/image/upload/v1586883423/person-4_t9nxjt.jpg",
    text:
      "Edison bulb put a bird on it humblebrag, marfa pok pok heirloom fashion axe cray stumptown venmo actually seitan. VHS farm-to-table schlitz, edison bulb pop-up 3 wolf moon tote bag street art shabby chic. ",
  },
];

// 选中DOM元素
const person = document.querySelector("#person-img");
const author = document.querySelector("#author");
const job = document.querySelector("#job");
const info = document.querySelector("#info");

const prevBtn = document.querySelector(".prev-btn");
const nextBtn = document.querySelector(".next-btn");
const randomBtn = document.querySelector(".randomBtn");

// 设置初始评论索引
let currentItem = 0; // 将 'number' 改名为 'currentItem' 以提高可读性

// 页面加载完成时显示第一个评论
window.addEventListener('DOMContentLoaded', function() {
  showPerson(currentItem); // 调用更新函数
});

// 根据索引显示评论的函数
function showPerson(index) {
  const item = reviews[index];
  person.src = item.img;
  author.innerHTML = item.name;
  job.innerHTML = item.job;
  info.innerHTML = item.text;
}

// “下一页”按钮事件监听器
nextBtn.addEventListener("click", function() {
  currentItem++;
  if(currentItem > reviews.length - 1) {
    currentItem = 0;
  }
  showPerson(currentItem);
});

// “上一页”按钮事件监听器
prevBtn.addEventListener("click", function() {
  currentItem--;
  if(currentItem < 0) {
    currentItem = reviews.length - 1;
  }
  showPerson(currentItem);
});

// “随机”按钮事件监听器
randomBtn.addEventListener("click", function() {
  currentItem = Math.floor(Math.random() * reviews.length);
  showPerson(currentItem);
});