仿淘宝放大镜

可以直接复制代码
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>放大镜</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/Swiper/3.4.2/css/swiper.css">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/Swiper/3.4.2/js/swiper.min.js"></script>

    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/jquery/3.0.0/jquery.min.js"></script>
    <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <style type="text/css">
        * { margin:0px; padding:0px;}
#box { width:400px; height:400px; margin:100px auto; position:relative;}
#box .simg {width:400px; height:400px; position:relative;}
#box .simg span.move { width:150px; height:150px; background:red; position:absolute; top:0; left:0; display:block; filter:alpha(opacity=50); opacity:0.5; display:none;}
#box .simg span.shade { width:100%; height:100%; position:absolute; top:0; left:0;filter:alpha(opacity=40); opacity:0.4;}
#box .bimg { width:400px; height:400px; position:absolute; left:430px; top:0px; overflow:hidden; display:none;}
#box .bimg img { position:absolute; } 
.simg img{max-width: 400px;max-height: 400px}
    </style>
</head>
<body>
    <div id="box">
        <div class="simg">
            <img src="http://pic1.ymatou.com/G02/shangou/M05/85/D4/CgvUBVuCW1eAbzXXAAGPjpReFgk122_1_1_n_w_o.jpg"/>
            <span class="move"></span>
            <span class="shade"></span>
        </div>
        <div class="bimg"><img src="http://pic1.ymatou.com/G02/shangou/M05/85/D4/CgvUBVuCW1eAbzXXAAGPjpReFgk122_1_1_n_w_o.jpg"/></div>
    </div>
</body>
<script type="text/javascript" src="js/jquery-1.10.2.min.js"></script>
<script>
    $(function(){
        $(".shade").hover(function(){
            $(".move").show();
            $(".bimg").show();
            },function(){
            $(".move").hide();
            $(".bimg").hide();
                });
        $(".shade").mousemove(function(e){
            var l=e.clientX;
            var t=e.clientY;

            var _top=t-$("#box").offset().top-$(".move").height()/2+"px";
            var _left=l-$("#box").offset().left-$(".move").width()/2+"px";
            
            //不让从上面和下面出去
            if(parseInt(_top)<0){
                _top=0+'px';
                }else if(parseInt(_top)>parseInt($("#box").height()-$(".move").height())){
                    _top=parseInt($("#box").height()-$(".move").height())+"px";
                    }
                    
            //不让从两边出去
            if(parseInt(_left)<0){
                _left=0+"px";
                }else if(parseInt(_left)>parseInt($("#box").width()-$(".move").width())){_left=parseInt($("#box").width()-$(".move").width())+'px';}
            
            $(".move").css({top:_top,left:_left});
            
            //小图可滑动的比例
            var hd_x=parseInt(_left)/parseInt($("#box").width()-$(".move").width());
            var hd_y=parseInt(_top)/parseInt($("#box").height()-$(".move").height());
            
            //大图对应的top left
            var bm_left=($(".bimg img").width()-$(".bimg").width())*hd_x;
            var bm_top=($(".bimg img").height()-$(".bimg").height())*hd_y;
            $(".bimg img").css({top:-bm_top,left:-bm_left});
            
            
            });        
                
        
        });


</script>
</html>
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