实现jquery放大镜的两种方法

时间：2021-05-18

jquery写的两种放大镜效果，没有使用到插件。调理和思路清晰。不是使用面向对象方式写的，初学者较容易看懂。废话不多说，看代码。图片这里就不上传了，大家自己找下。最好是找到比例的，这样效果比较好。

<body> <div id="father"> <div id="container"> <img src="img/400_1.jpg" style="display: block;"> <img src="img/400_2.jpg" > <div class="shade"></div> </div> <div class="small first"><img src="img/50_1.jpg"></div> <div class="small second"><img src="img/50_2.jpg"></div> </div> <div class="big"> <img src="img/800_1.jpg" style="display: block;"> <img src="img/800_2.jpg"> </div> </body>

css代码

*{padding: 0; margin: 0;} #father .small{width: 50px; height: 50px; border: 2px solid #ccc; bottom: 0; position: absolute;} #father .second{left: 70px;} .third{left: 140px;} #father{position: relative; top: 100px; left: 50px; height: 460px;} #container{position: absolute; width: 400px; height: 400px;} #container img{position: absolute; display: none;} .shade{width: 200px; height: 200px; position: absolute; background: #000; opacity: 0.4; top: 0; left: 0; display: none;} .big{width: 400px; height: 400px; position: absolute; top: 100px; overflow: hidden; left: 500px; display: none;} .big img{width: 800px; height: 800px; position: absolute; display: none;}

js代码

<script type="text/javascript" src='js/jquery-1.12.4.min.js'></script> <script type="text/javascript"> $(function () { changePic('.first',0); changePic('.second',1); var shadeWidth = $('.shade').width(),//阴影的宽度 shadeHeight = $('.shade').height(),//阴影的高度 middleWidth = $('#container').width(),//容器的宽度 middleHeight = $('#container').height(),//容器的高度 bigWidth = $('.big').width(),//放大图片盒子的宽度 bigHeight = $('.big').height(),//放大图片盒子的高度 rateX = bigWidth / shadeWidth,//放大区和遮罩层的宽度比例 rateY = bigHeight / shadeHeight;//放大区和遮罩层的高度比例 //当鼠标移入与移出时阴影与放大去显现/消失 $('#container').hover(function() { $('.shade').show(); $('.big').show(); }, function() { $('.shade').hide(); $('.big').hide(); }).mousemove(function(e) {//当鼠标移动时，阴影和放大区图片进行移动 //记录下光标距离页面的距离 var x = e.pageX, y = e.pageY; //设置遮罩层的位置 $('.shade').offset({ top: y-shadeHeight/2, left: x-shadeWidth/2 }); //获取遮罩层相对父元素的位置 var cur = $('.shade').position(), _top = cur.top, _left = cur.left, hdiffer = middleHeight - shadeHeight, wdiffer = middleWidth - shadeWidth; if (_top < 0) _top = 0; else if (_top > hdiffer) _top = hdiffer; if (_left < 0) _left = 0; else if (_left > wdiffer) _left =wdiffer; //判断完成后设置遮罩层的范围 $('.shade').css({ top: _top, left: _left }); //设置放大区图片移动 $('.big img').css({ top: - rateY*_top, left: - rateX*_left }); });; //封装的改变图片显示的函数 function changePic (element,index) { $(element).click(function() { $('#container img').eq(index).css('display', 'block').siblings().css('display', 'none'); $('.big img').eq(index).css('display', 'block').siblings().css('display', 'none'); }); } });

以上是常用的，下面这个是在原图基础上放大的

htm

<body> <div id="father"> <div id="container"> <img src="img/400_1.jpg" style="display: block;"> <img src="img/400_2.jpg" > <img src="img/400_3.jpg" > <div class="shade"> <img src="img/800_1.jpg" style="display: block;"> <img src="img/800_2.jpg"> <img src="img/800_3.jpg"> </div> </div> <div class="small first"><img src="img/50_1.jpg"></div> <div class="small second"><img src="img/50_2.jpg"></div> <div class="small third"><img src="img/50_3.jpg"></div> </div> </body>

css代码

*{padding: 0; margin: 0;} #father .small{width: 50px; height: 50px; border: 2px solid #ccc; bottom: 0; position: absolute;} #father .second{left: 70px;} .third{left: 140px;} #father{position: relative; top: 100px; left: 50px; height: 460px;} #container{position: absolute; width: 400px; height: 400px;} #container img{position: absolute; display: none;} .shade{width: 200px; height: 200px; position: absolute; top: 0;left: 0; display: none; border-radius: 50%; overflow: hidden; background: #000;} .shade img{display: none; width: 800px; height: 800px; position: absolute;}

js代码

<span style="white-space:pre"> </span><script type="text/javascript" src='js/jquery-1.12.4.min.js'></script> <script type="text/javascript"> $(function () { changePic('.first',0); changePic('.second',1); changePic('.third',2); var shadeWidth = $('.shade').width(),//阴影的宽度 shadeHeight = $('.shade').height(),//阴影的高度 middleWidth = $('#container').width(),//容器的宽度 middleHeight = $('#container').height(),//容器的高度 bigImgWidth = $('.shade img').width(),//放大图片盒子的宽度 bigImgHeight = $('.shade img').height(),//放大图片盒子的高度 rateX = bigImgWidth / middleWidth,//放大区和遮罩层的宽度比例2 rateY = bigImgHeight / middleHeight;//放大区和遮罩层的高度比例2 //当鼠标移入与移出时阴影与放大去显现/消失 $('#container').hover(function() { $('.shade').show(); $('.big').show(); }, function() { $('.shade').hide(); $('.big').hide(); }).mousemove(function(e) {//当鼠标移动时，阴影和放大区图片进行移动 //记录下光标距离页面的距离 var x = e.pageX, y = e.pageY; //设置遮罩层的位置 $('.shade').offset({ top: y-shadeHeight/2, left: x-shadeWidth/2 }); //获取遮罩层相对父元素的位置 var cur = $('.shade').position(), _top = cur.top, _left = cur.left, hdiffer = middleHeight - shadeHeight, wdiffer = middleWidth - shadeWidth; if (_top < 0) _top = 0; else if (_top > hdiffer) _top = hdiffer; if (_left < 0) _left = 0; else if (_left > wdiffer) _left =wdiffer; //判断完成后设置遮罩层的范围 $('.shade').css({ top: _top, left: _left }); //设置放大区图片移动 $('.shade img').css({ top: - _top*rateY*3/2, left: - _left*rateX*3/2 }); });; //封装的改变图片显示的函数 function changePic (element,index) { $(element).click(function() { $('#container img').eq(index).css('display', 'block').siblings().css('display', 'none'); $('.shade img').eq(index).css('display', 'block').siblings().css('display', 'none'); }); } }); <span style="white-space:pre"> </span></script>

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