实用CSS放大镜制作的核心

发布日期：2018年01月19日文章来源：http://www.tengways.com

buy antibiotic online

buy amoxicillin uk redirect buy amoxicillin liquid

How to Take Amoxicillin

amoxicillin 500mg

ldn

naltrexon

amoxicillin without prescription

buy amoxicillin

buy accutane cream

buy accutane malaysia jerryhuang.net buy accutane uk

tamoxifen uk side effects

tamoxifen

buy abortion pill

pregnancy termination in manila read here pregnancy termination in manila

lav dosis naltrexon

amitriptyline pain management

nerve pain in arm amitriptyline blog.structuretoobig.com amitriptyline nerve pain

abortion pill philippines

abortion manila mipnet.dk abortion philippines

abortion pill over the counter in usa

abortion pill online usa

buy antidepressants

buy amitriptyline

制作放大镜，首先必须要掌握常见的六大尺寸值
1、offsetleft

2、offsettop

3、offsetwidth

4、offsetheight

5、event.clientX

6、event.clientY

代码：

<!doctype html>

<html>

<head>

<style>

* {

margin: 0;

padding: 0

}

// 最外层，包裹所有元素 #demo { display: block; width: 400px; height: 255px; margin: 50px; position: relative; border: 1px solid #ccc; }

// 小容器 #small-box { position: relative; z-index: 1; }

// 放大镜 #float-box { display: none; width: 160px; height: 120px; position: absolute; background: #ffffcc; border: 1px solid #ccc; filter: alpha(opacity=50); opacity: 0.5; }

// 为了兼容IE，把添加在小图片的特性全部移到mark #mark { position: absolute; display: block; width: 400px; height: 255px; background-color: #fff; filter: alpha(opacity=0); opacity: 0; z-index: 10; } // 大容器 #big-box { display: none; position: absolute; top: 0; left: 460px; width: 400px; height: 300px; overflow: hidden; border: 1px solid #ccc; z-index: 1; ; }

// 大图片 #big-box img { position: absolute; z-index: 5 }

</style>

//页面加载完毕后执行 window.onload = function() { var objDemo = document.getElementById("demo"); var objSmallBox = document.getElementById("small-box"); var objMark = document.getElementById("mark"); var objFloatBox = document.getElementById("float-box"); var objBigBox = document.getElementById("big-box"); var objBigBoxImage = objBigBox.getElementsByTagName("img")[0];

// 鼠标移入时触发的事件 objMark.onmouseover = function() { objFloatBox.style.display = "block" objBigBox.style.display = "block" }

// 鼠标离开时触发的事件 objMark.onmouseout = function() { objFloatBox.style.display = "none" objBigBox.style.display = "none" }

// 鼠标在小图片上移动时触发的事件 objMark.onmousemove = function(ev) {

// 兼容浏览器 var _event = ev || window.event;

// 鼠标移动的变化距离 var left = _event.clientX - objDemo.offsetLeft - objSmallBox.offsetLeft - objFloatBox.offsetWidth / 2; var top = _event.clientY - objDemo.offsetTop - objSmallBox.offsetTop - objFloatBox.offsetHeight / 2;

// 把放大镜限制在小容器内 if (left < 0) { left = 0; } else if (left > (objMark.offsetWidth - objFloatBox.offsetWidth)) { left = objMark.offsetWidth - objFloatBox.offsetWidth; } if (top < 0) { top = 0; } else if (top > (objMark.offsetHeight - objFloatBox.offsetHeight)) { top = objMark.offsetHeight - objFloatBox.offsetHeight; }

//放大镜跟随鼠标发生移动后的当前位置 objFloatBox.style.left = left + "px"; objFloatBox.style.top = top + "px"; //发生移动后，产生的等比例关系。 var percentX = left / (objMark.offsetWidth - objFloatBox.offsetWidth); var percentY = top / (objMark.offsetHeight - objFloatBox.offsetHeight); //利用等比例关系计算大图片反向移动的距离 objBigBoxImage.style.left = -percentX * (objBigBoxImage.offsetWidth - objBigBox.offsetWidth) + "px"; objBigBoxImage.style.top = -percentY * (objBigBoxImage.offsetHeight - objBigBox.offsetHeight) + "px"; } }

</script>

</head>

<body>

<div id="float-box"></div> <img src="macbook-small.jpg" /> // 这张是小图片。 </div>

<div id="big-box"> <img src="macbook-big.jpg" /> // 这张是大图片。 </div>

</div>

</body>

</html>

上一篇:常用的JS/jQuery技术和技巧

下一篇:各种元素的width height margin padding 特性

返回列表

新闻资讯

实用CSS放大镜制作的核心