自己动手丰衣足食之图片放大镜

最新推荐文章于 2022-08-17 20:41:50 发布

绿萝哥哥

最新推荐文章于 2022-08-17 20:41:50 发布

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本文链接：https://blog.youkuaiyun.com/uffgfbft/article/details/83821739

本文详细介绍了如何使用CSS和JavaScript实现网页上的图片放大镜效果，包括鼠标悬停时显示放大图片及跟随鼠标移动的透明遮罩层。通过计算鼠标位置和图片比例，使放大图片能精确展示鼠标所指细节。

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需要两张图片，下载：http://download.youkuaiyun.com/detail/cometwo/9530731

这里写图片描述

<!DOCTYPE html><html lang="en">    <head>        <meta charset="UTF-8">        <title>放大镜练习</title>        <style type="text/css">            * {                margin: 0px;                padding: 0px;            }            #small {                width: 400px;                height: 400px;                overflow: hidden;                margin-left: 10px;                margin-top: 10px;                z-index: 1;                position: relative;                border: 1px solid red;            }            #small img {                position: absolute;                top: 0;                left: 0;            }            #float {                display: block;                width: 50px;                height: 50px;                background: green;                opacity: 0.3;                z-index: 2;                position: absolute;                display: none;            }            #big {                width: 400px;                height: 400px;                overflow: hidden;                margin-top: -400px;                margin-left: 420px;                position: relative;                display: none;                border: 1px solid blue;            }            #big img {                position: absolute;                left: 0;            }            p{                margin-top: 10px;                margin-left: 10px;            }        </style>        <script type="text/javascript">            window.onload = function() {                window.onmousemove = function(e) {                    document.getElementById('cl').innerHTML = "鼠标指针pageX,pageY坐标:" + e.pageX + "," + e.pageY;                }            }        </script>    </head>    <body>        <div id="small">            <span id="float"></span>            <img src="2.jpg">        </div>        <div id="big">            <img id="no" src="1.jpg">        </div>        <p><span id="cl"></span></p>        <p><span id="zb"></span></p>        <script type="text/javascript">            (function() {                var oSmall = document.getElementById('small');                var oFloat = document.getElementById('float');                var oBig = document.getElementById('big');                var oImg = oBig.getElementsByTagName('img')[0];                oSmall.onmouseover = function() {                    oBig.style.display = 'block';                    oFloat.style.display = 'block';                }                oSmall.onmouseout = function() {                    oBig.style.display = 'none';                    oFloat.style.display = 'none';                }                oSmall.onmousemove = function(ev) {                    var oEvent = ev || event;                    /*****************/                    var zb = document.getElementById('zb');                    zb.innerHTML = "鼠标指针clientX,clientY的坐标:" + oEvent.clientX + "," + oEvent.clientY;                    zb.innerHTML = zb.innerHTML + ",</br>oSmall的offsetLeft,offsetTop:" + oSmall.offsetLeft + "," + oSmall.offsetTop;                    zb.innerHTML = zb.innerHTML + ",</br>oFloat的offsetWidth,offsetHeight:" + oFloat.offsetWidth + "," + oFloat.offsetHeight;                    /*****************/                    /*计算出滑块的left,top*/                    var l = oEvent.clientX - oSmall.offsetLeft - oFloat.offsetWidth / 2;                    var t = oEvent.clientY - oSmall.offsetTop - oFloat.offsetHeight / 2;                    if (l < 0) {                        l = 0                    } else if (l > oSmall.offsetWidth - oFloat.offsetWidth) {                        l = oSmall.offsetWidth - oFloat.offsetWidth                    }                    if (t < 0) {                        t = 0                    } else if (t > oSmall.offsetHeight - oFloat.offsetWidth) {                        t = oSmall.offsetHeight - oFloat.offsetHeight;                    }                    oFloat.style.left = l + 'px';                    oFloat.style.top = t + 'px';                    zb.innerHTML = zb.innerHTML + "<br/>" + l + "," + t;                    //计算出相对百分比                    var percentX = l / (oSmall.offsetWidth - oFloat.offsetWidth);                    var percentY = t / (oSmall.offsetHeight - oFloat.offsetHeight);                    oImg.style.left = -percentX * (oBig.offsetWidth) + 'px';                    oImg.style.top = -percentY * (oBig.offsetHeight) + 'px';                }            })();        </script>    </body></html>
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拓展知识

主要使用了document对象关于窗口的一些属性,这些属性的主要功能和用法如下。要 得到窗口的尺寸，对于不同的浏览器，需要使用不同的属性和方法：若要检测窗口的真实尺寸，在netscape下需要使用window的属性；在ie下需 要深入document内部对body进行检测；在dom环境下，若要得到窗口的尺寸，需要注意根元素的尺寸，而不是元素。window对象的innerwidth属性包含当前窗口的内部宽度。window对象的innerheight属性包含当前窗口的内部高度。document对象的body属性对应html文档的标签。document对象的documentelement属性则表示html文档的根节点。document.body.clientheight表示html文档所在窗口的当前高度。document.body. clientwidth表示html文档所在窗口的当前宽度。js获取屏幕高度var s = ""; s += " 网页可见区域宽："+ document.body.clientwidth;s += " 网页可见区域高："+ document.body.clientheight; s += " 网页可见区域宽："+ document.body.offsetwidth +" (包括边线和滚动条的宽)"; s += " 网页可见区域高："+ document.body.offsetheight +" (包括边线的宽)"; s += " 网页正文全文宽："+ document.body.scrollwidth; s += " 网页正文全文高："+ document.body.scrollheight; s += " 网页被卷去的高："+ document.body.scrolltop; s += " 网页被卷去的左："+ document.body.scrollleft; s += " 网页正文部分上："+ window.screentop; s += " 网页正文部分左："+ window.screenleft; s += " 屏幕分辨率的高："+ window.screen.height; s += " 屏幕分辨率的宽："+ window.screen.width; s += " 屏幕可用工作区高度："+ window.screen.availheight; s += " 屏幕可用工作区宽度："+ window.screen.availwidth; s += " 你的屏幕设置是 "+ window.screen.colordepth +" 位彩色"; s += " 你的屏幕设置 "+ window.screen.devicexdpi +" 像素/英寸";好文要顶 关注我 收藏该文  
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