jquery经典实例之放大镜

逃离我推掉我的手 2021-07-24 19:27 476阅读 0赞

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=GBK">
        <title>放大镜</title>
    
        <style>
                *{
                    margin: 0;
                    padding: 0;
                }
                .outer{
                    position:relative;
                    width:350px;
                    height:350px;
                    border:1px solid black;
                }
                .outer .small-box{
                    position: relative;
                    z-index: 1;
                }
                .outer .small-box .mark{
                    position: absolute;
                    display: block;
                    width: 350px;
                    height: 350px;
                    background-color: #fff;
                    filter: alpha(opacity=0);
                    opacity: 0;
                    z-index: 10;
                }
                .outer .small-box .float-box{
                    display: none;
                    width: 175px;
                    height: 175px;
                    position: absolute;
                    background: #DAEEFC;
                    filter: alpha(opacity=40);
                    opacity: 0.4;
                }
                .outer .big-box{
                    position: absolute;
                    top: 0;
                    left: 351px;
                    width: 350px;
                    height: 350px;
                    overflow: hidden;
                    border: 1px solid transparent;
                    z-index: 1;
                }
                .outer .big-box img{
                    position: absolute;
                    z-index: 5
                }
        </style>
    </head>
    <body>
    
        <div  class="outer">
            <div  class="small-box">
                <div  class="mark"></div>
                <div  class="float-box" ></div>
                <img width="350" height="350" src="../1.jpg">
            </div>
            <div class="big-box">
                <img width="900px" height="900px" src="../1.jpg" >
            </div>
        </div>
    
        <script src="jquery-1.4.min.js"></script>
    
    <script>
       $(function(){
            $(".mark").mouseover(function () {
                $(".float-box").css("display","block");
                $(".big-box").css("display","block");
            });
    
            $(".mark").mouseout(function () {
                $(".float-box").css("display","none");
                $(".big-box").css("display","none");
            });
    
            $(".mark").mousemove(function (e) {
                var _event = e || window.event;  //兼容多个浏览器的event参数模式
    
                var float_box_width  = $(".float-box")[0].offsetWidth;
                var float_box_height = $(".float-box")[0].offsetHeight;//175,175
    
                var float_box_width_half  =  float_box_width / 2;
                var float_box_height_half =  float_box_height/ 2;//87.5,87.5
    
                var small_box_width  =  $(".outer")[0].offsetWidth;
                var small_box_height =  $(".outer")[0].offsetHeight;//360,360
    
                var mouse_left = _event.clientX   - float_box_width_half;
                var mouse_top = _event.clientY  - float_box_height_half;
    
                if (mouse_left < 0) {
                    mouse_left = 0;
                } else if (mouse_left > small_box_width - float_box_width) {
                    mouse_left = small_box_width - float_box_width;
                }
                if (mouse_top < 0) {
                    mouse_top = 0;
                } else if (mouse_top > small_box_height - float_box_height) {
                    mouse_top = small_box_height - float_box_height;
                }
    
                $(".float-box").css("left",mouse_left + "px");
                $(".float-box").css("top",mouse_top + "px");
                
                var percentX = ($(".big-box img")[0].offsetWidth - $(".big-box")[0].offsetWidth) / (small_box_width - float_box_width);
                var percentY = ($(".big-box img")[0].offsetHeight - $(".big-box")[0].offsetHeight) / (small_box_height - float_box_height);
            
                $(".big-box img").css("left",-percentX * mouse_left + "px");
                $(".big-box img").css("top",-percentY * mouse_top + "px")
    
            })
       })
    
    </script>
    </body>
    </html>