JavaScript實現簡單的圖片切換功能(實例代碼)
代碼如下所示：
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <title>圖片切換</title> <style> *{ margin: 0; padding: 0; } .box{ width: 200px; height: 300px; margin: 50px auto; padding: 20px; background-color: skyblue; text-align: center; } img{ width: 200px; height: 200px; margin: 20px 0; } </style> <script> // 存儲照片地址的數組 let imgArr = ['https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051704animal1.png', 'https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051711animal2.png', 'https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051717animal3.png', 'https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051722animal4.png', 'https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051726animal5.png']; // 照片的索引 let index = 0; window.onload = function() { let oP = document.getElementsByTagName('p')[0]; oP.innerHTML = '一共有' + imgArr.length + '張照片,這是第' + (index+1) +'張'; let oImg = document.getElementsByTagName('img')[0]; let oPrev = document.getElementsByClassName('prev')[0]; let oNext = document.getElementsByClassName('next')[0]; // 點擊上一張響應事件 oPrev.onclick = function () {index--;//實現照片循環if (index < 0) { index = imgArr.length-1;}oP.innerHTML = '一共有' + imgArr.length + '張照片,這是第' + (index+1) +'張';oImg.src = imgArr[index]; }; // 點擊下一張響應事件 oNext.onclick = function () {index++;//實現照片循環if (index >= imgArr.length) { index = 0;}oP.innerHTML = '一共有' + imgArr.length + '張照片,這是第' + (index+1) +'張';oImg.src = imgArr[index]; }; }; </script></head><body> <div class='box'> <p></p> <img src='http://www.gepszalag.com/images/animal1.png' alt=''> <button class='prev'>上一張</button> <button class='next'>下一張</button> </div></body></html>
最終的效果
總結
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