How to use html+css+JavaScript to achieve simple image switching effects

This article mainly introduces a simple image switching special effect implemented with html+css+js. Friends who need it can refer to

as shown in the picture.


The image switching effect is very simple to implement and has good compatibility.

The html page is as follows

<p class="wrapper"> 
<p id="focus"> 
<ul> 
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="/static/imghwm/default1.png"  data-src="img/01.jpg"  class="lazy"   alt="QQ商城焦点图效果下载" /></a></li> 
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="/static/imghwm/default1.png"  data-src="img/02.jpg"  class="lazy"   alt="QQ商城焦点图效果教程" /></a></li> 
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="/static/imghwm/default1.png"  data-src="img/03.jpg"  class="lazy"   alt="jquery商城焦点图效果" /></a></li> 
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="/static/imghwm/default1.png"  data-src="img/04.jpg"  class="lazy"   alt="jquery商城焦点图代码" /></a></li> 
<li><a href="http://www.lanrentuku.com/" target="_blank"><img src="/static/imghwm/default1.png"  data-src="img/05.jpg"  class="lazy"   alt="jquery商城焦点图源码" /></a></li> 
</ul> 
</p> 
</p><!-- wrapper end --> 
</body>

css style

<style type="text/css"> 
* {margin:0; padding:0;} 
body {font-size:12px; color:#222; font-family:Verdana,Arial,Helvetica,sans-serif; background:#f0f0f0;} 
.clearfix:after {content: "."; display: block; height: 0; clear: both; visibility: hidden;} 
.clearfix {zoom:1;} 
ul,li {list-style:none;} 
img {border:0;} 

.wrapper {width:800px; margin:0 auto; padding-bottom:50px;} 

/* qqshop focus */ 
#focus {width:800px; height:280px; overflow:hidden; position:relative;} 
#focus ul {height:380px; position:absolute;} 
#focus ul li {float:left; width:800px; height:280px; overflow:hidden; position:relative; background:#000;} 
#focus ul li p {position:absolute; overflow:hidden;} 
#focus .btnBg {position:absolute; width:800px; height:20px; left:0; bottom:0; background:#000;} 
#focus .btn {position:absolute; width:780px; height:10px; padding:5px 10px; right:0; bottom:0; text-align:right;} 
#focus .btn span {display:inline-block; _display:inline; _zoom:1; width:25px; height:10px; _font-size:0; margin-left:5px; cursor:pointer; background:#fff;} 
#focus .btn span.on {background:#fff;} 
#focus .preNext {width:45px; height:100px; position:absolute; top:90px; background:url(img/sprite.png) no-repeat 0 0; cursor:pointer;} 
#focus .pre {left:0;} 
#focus .next {right:0; background-position:right top;} 
</style>

js script

$(function() { 
var sWidth = $("#focus").width(); //获取焦点图的宽度（显示面积） 
var len = $("#focus ul li").length; //获取焦点图个数 
var index = 0; 
var picTimer; 
//以下代码添加数字按钮和按钮后的半透明条，还有上一页、下一页两个按钮 
var btn = "<p class=&#39;btnBg&#39;></p><p class=&#39;btn&#39;>"; 
for(var i=0; i < len; i++) { 
btn += "<span></span>"; 
} 
btn += "</p><p class=&#39;preNext pre&#39;></p><p class=&#39;preNext next&#39;></p>"; 
$("#focus").append(btn); 
$("#focus .btnBg").css("opacity",0.5); 
//为小按钮添加鼠标滑入事件，以显示相应的内容 
$("#focus .btn span").css("opacity",0.4).mouseenter(function() { 
index = $("#focus .btn span").index(this); 
showPics(index); 
}).eq(0).trigger("mouseenter"); 
//上一页、下一页按钮透明度处理 
$("#focus .preNext").css("opacity",0.2).hover(function() { 
$(this).stop(true,false).animate({"opacity":"0.5"},300); 
},function() { 
$(this).stop(true,false).animate({"opacity":"0.2"},300); 
}); 
//上一页按钮 
$("#focus .pre").click(function() { 
index -= 1; 
if(index == -1) {index = len - 1;} 
showPics(index); 
}); 
//下一页按钮 
$("#focus .next").click(function() { 
index += 1; 
if(index == len) {index = 0;} 
showPics(index); 
}); 
//本例为左右滚动，即所有li元素都是在同一排向左浮动，所以这里需要计算出外围ul元素的宽度 
$("#focus ul").css("width",sWidth * (len)); 
//鼠标滑上焦点图时停止自动播放，滑出时开始自动播放 
$("#focus").hover(function() { 
clearInterval(picTimer); 
},function() { 
picTimer = setInterval(function() { 
showPics(index); 
index++; 
if(index == len) {index = 0;} 
},4000); //此4000代表自动播放的间隔，单位：毫秒 
}).trigger("mouseleave"); 
//显示图片函数，根据接收的index值显示相应的内容 
function showPics(index) { //普通切换 
var nowLeft = -index*sWidth; //根据index值计算ul元素的left值 
$("#focus ul").stop(true,false).animate({"left":nowLeft},300); //通过animate()调整ul元素滚动到计算出的position 
//$("#focus .btn span").removeClass("on").eq(index).addClass("on"); //为当前的按钮切换到选中的效果 
$("#focus .btn span").stop(true,false).animate({"opacity":"0.4"},300).eq(index).stop(true,false).animate({"opacity":"1"},300); //为当前的按钮切换到选中的效果 
} 
});

Used left and right switching images

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