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| 1 | +<!DOCTYPE html> |
| 2 | +<html lang="en"> |
| 3 | +<head> |
| 4 | + <meta charset="UTF-8"> |
| 5 | + <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| 6 | + <meta http-equiv="X-UA-Compatible" content="ie=edge"> |
| 7 | + <title>放大镜特效</title> |
| 8 | +<style> |
| 9 | + * { |
| 10 | + margin: 0; |
| 11 | + padding: 0 |
| 12 | + } |
| 13 | + #demo { |
| 14 | + display: block; |
| 15 | + width: 400px; |
| 16 | + height: 255px; |
| 17 | + margin: 50px; |
| 18 | + position: relative; |
| 19 | + border: 1px solid #ccc; |
| 20 | + } |
| 21 | + #small-box { |
| 22 | + position: relative; |
| 23 | + z-index: 1; |
| 24 | + } |
| 25 | + #float-box { |
| 26 | + display: none; |
| 27 | + width: 160px; |
| 28 | + height: 120px; |
| 29 | + position: absolute; |
| 30 | + background: #ffffcc; |
| 31 | + border: 1px solid #ccc; |
| 32 | + filter: alpha(opacity=50); |
| 33 | + opacity: 0.5; |
| 34 | + } |
| 35 | + #mark { |
| 36 | + position: absolute; |
| 37 | + display: block; |
| 38 | + width: 400px; |
| 39 | + height: 255px; |
| 40 | + background-color: #fff; |
| 41 | + filter: alpha(opacity=0); |
| 42 | + opacity: 0; |
| 43 | + z-index: 10; |
| 44 | + } |
| 45 | + #big-box { |
| 46 | + display: none; |
| 47 | + position: absolute; |
| 48 | + top: 0; |
| 49 | + left: 460px; |
| 50 | + width: 400px; |
| 51 | + height: 300px; |
| 52 | + overflow: hidden; |
| 53 | + border: 1px solid #ccc; |
| 54 | + z-index: 1;; |
| 55 | + } |
| 56 | + #big-box img { |
| 57 | + position: absolute; |
| 58 | + z-index: 5 |
| 59 | + } |
| 60 | +</style> |
| 61 | +<script> |
| 62 | + //页面加载完毕后执行 |
| 63 | + window.onload = function () { |
| 64 | + var objDemo = document.getElementById("demo"); |
| 65 | + var objSmallBox = document.getElementById("small-box"); |
| 66 | + var objMark = document.getElementById("mark"); |
| 67 | + var objFloatBox = document.getElementById("float-box"); |
| 68 | + var objBigBox = document.getElementById("big-box"); |
| 69 | + var objBigBoxImage = objBigBox.getElementsByTagName("img")[0]; |
| 70 | + //鼠标一如事件 |
| 71 | + objMark.onmouseover = function () { |
| 72 | + objFloatBox.style.display = "block" |
| 73 | + objBigBox.style.display = "block" |
| 74 | + } |
| 75 | + //鼠标移出事件 |
| 76 | + objMark.onmouseout = function () { |
| 77 | + objFloatBox.style.display = "none" |
| 78 | + objBigBox.style.display = "none" |
| 79 | + } |
| 80 | + //鼠标移动事件 |
| 81 | + objMark.onmousemove = function (ev) { |
| 82 | + var _event = ev || window.event; //兼容多个浏览器的event参数模式 |
| 83 | + var left = _event.clientX - objDemo.offsetLeft - objSmallBox.offsetLeft - objFloatBox.offsetWidth / 2; |
| 84 | + var top = _event.clientY - objDemo.offsetTop - objSmallBox.offsetTop - objFloatBox.offsetHeight / 2; |
| 85 | + if (left < 0) { |
| 86 | + left = 0; |
| 87 | + } else if (left > (objMark.offsetWidth - objFloatBox.offsetWidth)) { |
| 88 | + left = objMark.offsetWidth - objFloatBox.offsetWidth; |
| 89 | + } |
| 90 | + if (top < 0) { |
| 91 | + top = 0; |
| 92 | + } else if (top > (objMark.offsetHeight - objFloatBox.offsetHeight)) { |
| 93 | + top = objMark.offsetHeight - objFloatBox.offsetHeight; |
| 94 | + } |
| 95 | + objFloatBox.style.left = left + "px"; //oSmall.offsetLeft的值是相对什么而言 |
| 96 | + objFloatBox.style.top = top + "px"; |
| 97 | + var percentX = left / (objMark.offsetWidth - objFloatBox.offsetWidth); |
| 98 | + var percentY = top / (objMark.offsetHeight - objFloatBox.offsetHeight); |
| 99 | + objBigBoxImage.style.left = -percentX * (objBigBoxImage.offsetWidth - objBigBox.offsetWidth) + "px"; |
| 100 | + objBigBoxImage.style.top = -percentY * (objBigBoxImage.offsetHeight - objBigBox.offsetHeight) + "px"; |
| 101 | + } |
| 102 | + } |
| 103 | +</script> |
| 104 | +</head> |
| 105 | +<body> |
| 106 | +<div id="demo"> |
| 107 | + <!-- 左边的小图 --> |
| 108 | + <div id="small-box"> |
| 109 | + <div id="mark"></div> |
| 110 | + <!-- 放大镜 --> |
| 111 | + <div id="float-box"></div> |
| 112 | + <img src="small.jpg"/> |
| 113 | + </div> |
| 114 | + <!-- 显示的大图 --> |
| 115 | + <div id="big-box"> |
| 116 | + <img src="big.jpg"/> |
| 117 | + </div> |
| 118 | +</div> |
| 119 | +</body> |
| 120 | +</html> |
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