第三章 web前端开发工程师--JavaScript进阶程序设计 3-3 图片切换综合示例
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2022-03-04 19:12:46
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JavaScript图片切换综合实例
本节课所讲内容：
- JavaScript 图片切换综合实例
主讲教师：Head老师
一. JavaScript 新闻网站字体控制
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
p {
margin:0;
}
body {
text-align:center;
}
#box {
width:790px;
height:340px;
border:5px solid green;
margin:50px auto 0;
position:relative;
}
a {
width:40px;
height:40px;
background:red;
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:790px;
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:790px;
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:790px;
height:340px;
}
span {
position:absolute;
width:400px;
height:30px;
line-height:30px;
text-align:center;
top:-50px;
left:0;
font-family:'微软雅黑';
left:200px;
}
</style>
<script>
window.onload = function (){
var oPrev = document.getElementById('prev');
var oNext = document.getElementById('next');
var oP = document.getElementById('p1');
var oStrong = document.getElementById('strong1');
var oImg = document.getElementById('img1');
var aBtn = document.getElementsByTagName('input');
var arrUrl = [ 'img/01.png', 'img/02.png', 'img/03.png', 'img/04.png' ];
var arrText = [ '冰箱洗衣机', '超级品牌日', '家电奢品廊', '降温大作战' ];
var num = 0;
var onOff = true;
aBtn[0].onclick = function (){
onOff = true;
document.getElementsByTagName('span')[0].innerHTML = '图片循环切换';
};
aBtn[1].onclick = function (){
onOff = false;
document.getElementsByTagName('span')[0].innerHTML = '图片顺序切换';
};
// 初始化
function fnTab(){
oP.innerHTML = arrText[num];
oStrong.innerHTML = num+1 + ' / ' + arrText.length;
oImg.src = arrUrl[num];
}
fnTab();
oPrev.onclick = function (){
num --;
if( num == -1 ){
if(onOff){num = arrText.length-1;}else{
alert('这已经是第一张了，不能再往前了~~');
num = 0;
}
//num = arrText.length-1;
}
fnTab();
};
oNext.onclick = function (){
num ++;
if( num == arrText.length ){
if(onOff){num = 0;}else{
alert('已经到最后一张啦~');
num = arrText.length-1;
}
}
fnTab();
};
};
</script>
</head>
<body>
<input type="button" value="循环切换" />
<input type="button" value="顺序切换" />
<div id="box"><span>图片切换</span>
<a id="prev" href="javascript:;"><</a>
<a id="next" href="javascript:;">></a>
<p id="p1">图片文字加载中……</p>
<strong id="strong1">图片数量计算中……</strong>
<img id="img1" />
</div>
</body>
</html>
效果图：
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