DEMO1：两张图片来回切换
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS点击两张图片来回切换</title>
<script>
window.onload = function(){
// 获取元素
var oImg = document.getElementById(‘img1‘);
// 定义一个自定义开关 默认为true
var onOff = true;
oImg.onclick = function(){
if(onOff){
oImg.src = ‘img/2.jpg‘;
}else{
oImg.src = ‘img/1.jpg‘;
}
// 取反
onOff = !onOff;
};
};
</script>
</head>
<body>
<img id="img1" src="img/1.jpg" />
</body>
</html>
DEMO2：点击图片，循环切换（多张）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>点击图片循环切换——多张</title>
<script>
window.onload = function(){
// 获取相关元素
var oImg = document.getElementById(‘img1‘);
var arr = [‘img/1.jpg‘,‘img/2.jpg‘,‘img/3.jpg‘,‘img/4.jpg‘];
var num = 0;
oImg.onclick = function(){
num ++;
if(num == arr.length){
num = 0;
}
oImg.src = arr[num];
};
};
</script>
</head>
<body>
<img id="img1" src = ‘img/1.jpg‘ />
</body>
</html>
DEMO3：点击按钮图片切换综合实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body { text-align:center; }
p { margin:0; }
#box { width:400px; height:400px; border:10px solid #ccc; margin:50px auto 0; position:relative; background: url(img/loading.gif) center center no-repeat; }
a { width:40px; height:40px; background:#fff; filter:alpha(opacity:80); opacity:0.8; position:absolute; top:160px; font-size:18px; color:#000; text-align:center; line-height:40px; text-decoration:none; }
a:hover { filter:alpha(opacity:30); opacity:0.3; }
#prev { left:10px; }
#next { right:10px; }
#p1 { width:400px; height:30px; line-height:30px; text-align:center; background:#000; color:#fff; font-size:14px; filter:alpha(opacity:80); opacity:0.8; position:absolute; bottom:0; left:0; }
strong { width:400px; height:30px; line-height:30px; text-align:center; background:#000; color:#fff; font-size:14px; filter:alpha(opacity:80); opacity:0.8; position:absolute; top:0; left:0; }
#img1 { width:400px; height:400px; }
span { position:absolute; width:400px; height:30px; line-height:30px; text-align:center; top:-50px; left:0; font-family:‘微软雅黑‘; }
</style>
<script>
window.onload = function(){
// 获取相关元素
var oPrev = document.getElementById(‘prev‘);
var oNext = document.getElementById(‘next‘);
var oStrong = document.getElementById(‘strong1‘);
var oP = document.getElementById(‘p1‘);
var oImg = document.getElementById(‘img1‘);
var aBtn = document.getElementsByTagName(‘input‘);
var oSpan = document.getElementById(‘span1‘);
var arrUrl = [‘img/1.jpg‘ ,‘img/2.jpg‘ ,‘img/3.jpg‘ ,‘img/4.jpg‘ ,‘img/5.jpg‘];
var arrText = [‘图片一‘,‘图片二‘,‘图片三‘,‘图片四‘,‘图片五‘];
var num = 0;
var onOff = true;
// 初始化
function init(){
oStrong.innerHTML = num+1 +‘/‘+ arrText.length;
oImg.src = arrUrl[num];
oP.innerHTML = arrText[num];
};
init();
// 向左切换
oPrev.onclick = function(){
num--;
if(num == -1){
if(onOff){
num = arrUrl.length-1;
}else{
alert(‘已经到第一张了！‘);
num = 0;
}
}
init();
};
// 向右切换
oNext.onclick = function(){
num++;
if(num == arrUrl.length){
if(onOff){
num = 0;
}else{
alert(‘已经到最后一张了！‘);
num = arrUrl.length-1;
}
}
init();
};
// 循环切换
aBtn[0].onclick = function(){
onOff = true;
oSpan.innerHTML = ‘图片可以从最后一张跳转到第一张循环切换‘;
};
// 顺序切换
aBtn[1].onclick = function(){
onOff = false;
oSpan.innerHTML = ‘图片只能到最后一张或只能到第一张‘;
};
};
</script>
</head>
<body>
<input type="button" value="循环切换" />
<input type="button" value="顺序切换" />
<div id="box">
<span id="span1">图片可以从最后一张跳转到第一张循环切换</span>
<a href="javascript:;" id="prev"><</a>
<a href="javascript:;" id="next">></a>
<strong id="strong1">图片数量计算中...</strong>
<p id="p1">图片文字加载中...</p>
<img id="img1" />
</div>
</body>
</html>
时间： 2024-11-07 22:05:35