實用CSS放大鏡制作的核心

發(fā)布日期：2018年01月19日文章來源：http://www.cd3t.com

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制作放大鏡，首先必須要掌握常見的六大尺寸值
1、offsetleft

2、offsettop

3、offsetwidth

4、offsetheight

5、event.clientX

6、event.clientY

代碼：

<!doctype html>

<html>

<head>

<style>

* {

margin: 0;

padding: 0

}

// 最外層，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; }

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

// 為了兼容IE，把添加在小圖片的特性全部移到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; ; }

// 大圖片 #big-box img { position: absolute; z-index: 5 }

</style>

//頁面加載完畢后執(zhí)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];

// 鼠標(biāo)移入時觸發(fā)的事件 objMark.onmouseover = function() { objFloatBox.style.display = "block" objBigBox.style.display = "block" }

// 鼠標(biāo)離開時觸發(fā)的事件 objMark.onmouseout = function() { objFloatBox.style.display = "none" objBigBox.style.display = "none" }

// 鼠標(biāo)在小圖片上移動時觸發(fā)的事件 objMark.onmousemove = function(ev) {

// 兼容瀏覽器 var _event = ev || window.event;

// 鼠標(biāo)移動的變化距離 var left = _event.clientX - objDemo.offsetLeft - objSmallBox.offsetLeft - objFloatBox.offsetWidth / 2; var top = _event.clientY - objDemo.offsetTop - objSmallBox.offsetTop - objFloatBox.offsetHeight / 2;

// 把放大鏡限制在小容器內(nèi) 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; }

//放大鏡跟隨鼠標(biāo)發(fā)生移動后的當(dāng)前位置 objFloatBox.style.left = left + "px"; objFloatBox.style.top = top + "px"; //發(fā)生移動后，產(chǎn)生的等比例關(guān)系。 var percentX = left / (objMark.offsetWidth - objFloatBox.offsetWidth); var percentY = top / (objMark.offsetHeight - objFloatBox.offsetHeight); //利用等比例關(guān)系計算大圖片反向移動的距離 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" /> // 這張是小圖片。 </div>

<div id="big-box"> <img src="macbook-big.jpg" /> // 這張是大圖片。 </div>

</div>

</body>

</html>

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