4.8 大图轮播

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>无标题文档</title>
        <style type="text/css">
            #tu{
                700px;
                height:500px;
                float:left;
                }
            .img{
                display:none;}
            #yuandian{
                500px;
                height:20px;
                margin-top:450px;
                margin-left:-200px;
                float:left;}
            .dian{
                20px;
                height:20px;
                border:5px solid red;
                border-radius:50%;
                float:left;
                margin-left:10px;
                
                }
        </style>
    </head>
    
    <body>
        <div id="tu">
            <img class="img" style="display:block" src="9d9376fa-b035-4bf3-9b95-0e2cd92f386e.jpg" width="700" height="500" />
            <img class="img" src="44ab5520-41e9-4bd7-bd0e-ea6dde13b89b.jpg" width="700" height="500" />
            <img class="img" src="77ecb4e3-1de5-4a4f-b165-400c59a71433.jpg" width="700" height="500" />
            <img class="img" src="32680e0e-45e3-45e5-8ccf-f5faa452c22a.jpg" width="700" height="500" />
            <img class="img" src="2184009b-c1d9-4376-8ac9-e396016efc56.jpg" width="700" height="500" />
        </div>
        <div id="yuandian">
            <div sy="0" class="dian" style="border-color:blue" onclick="Xuan(this,'0')"></div>
            <div sy="1" class="dian" onclick="Xuan(this,'1')"></div>
            <div sy="2" class="dian" onclick="Xuan(this,'2')"></div>
            <div sy="3" class="dian" onclick="Xuan(this,'3')"></div>
            <div sy="4" class="dian" onclick="Xuan(this,'4')"></div>
            
        </div>
    </body>
    
    <script type="text/javascript">
        window.setInterval("Huan()",1000);
        var sy = 0;
        function Huan()
        {
            var img = document.getElementsByClassName("img");    
            sy++;
            //限制条件：走到最后一张，跳到第一张继续
            if(sy>=img.length)
            {
                sy = 0;    
            }
            //让其他的图片隐藏
            for(var i=0;i<img.length;i++)
            {
                img[i].style.display = "none";        
            }
            //下一张图片显示    
            img[sy].style.display = "block";
            
            //原点的样式
            var d = document.getElementsByClassName("dian");
            for(var j=0;j<d.length;j++)
            {
                //判断属性值和索引是不是相等
                //获取属性
                if(d[j].getAttribute("sy")==sy)
                {
                    //相等的话边框颜色变色    
                    d[j].style.borderColor = "blue";    
                }
                else
                {
                    //不相等的话还是原来的颜色
                    d[j].style.borderColor = "red";        
                }    
            }
        }
        
        function Xuan(t,a)
        {
            sy = a;
            var img = document.getElementsByClassName("img");
            for(var i=0;i<img.length;i++)
            {
                img[i].style.display = "none";    
            }    
            img[a].style.display = "block";
            var d = document.getElementsByClassName("dian");
            for(var j=0;j<d.length;j++)
            {
                d[j].style.borderColor = "red";    
            }
            t.style.borderColor = "blue";
        }
    </script>
</html>
这个效果就可以选择图片中的小框即可浏览图片，而且颜色随着图片的变化而变化。