JavaScript實現簡單的圖片切換功能(例項程式碼)
阿新 • • 發佈：2020-04-11
程式碼如下所示：
<!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>
// 儲存照片地址的陣列
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];
// 點選上一張響應事件
oPrev.onclick = function () {
index--;
//實現照片迴圈
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];
};
// 點選下一張響應事件
oNext.onclick = function () {
index++;
//實現照片迴圈
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="../../images/animal1.png" alt="JavaScript實現簡單的圖片切換功能(例項程式碼)">
<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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