Created
June 10, 2013 06:29
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前端试题：图片放大镜
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Magnifier Demo</title> | |
| <style type="text/css"> | |
| body { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| .container { | |
| width: 700px; | |
| height: 500px; | |
| margin: 100px auto; | |
| } | |
| .origin { | |
| float: left; | |
| position: relative; | |
| width: 300px; | |
| height: 300px; | |
| overflow: hidden; | |
| border: 1px solid #eee; | |
| } | |
| .origin .lens { | |
| position: absolute; | |
| top: 3px; | |
| left: 3px; | |
| width: 50px; | |
| height: 50px; | |
| background: #666; | |
| z-index: 1; | |
| display: none; | |
| opacity: 0.3; | |
| filter: alpha(opacity: 30); | |
| border: 1px solid #000; | |
| } | |
| .origin .mask { | |
| width: 100%; | |
| height: 100%; | |
| top: 0; | |
| left: 0; | |
| position: absolute; | |
| z-index: 2; | |
| background: #000; | |
| cursor: move; | |
| opacity: 0; | |
| filter: alpha(opacity: 0); | |
| } | |
| .large { | |
| float: left; | |
| width: 350px; | |
| height: 250px; | |
| padding: 2px; | |
| overflow: hidden; | |
| display: inline; | |
| position: relative; | |
| margin: 0 0 0 10px; | |
| display: none; | |
| border: 5px solid #eee; | |
| -webkit-box-shadow: #333 1px 1px 5px; | |
| -moz-box-shadow: #333 1px 1px 5px; | |
| box-shadow: #333 1px 1px 5px; | |
| } | |
| .large img { | |
| position: absolute; | |
| top: 0; | |
| left: 0; | |
| } | |
| </style> | |
| </head> | |
| <script type="text/javascript"> | |
| "use strict"; | |
| function $(id) { | |
| return document.getElementById(id); | |
| } | |
| function $$(oParent, elem) { | |
| return (oParent || document).getElementsByTagName(elem); | |
| } | |
| function $$$(oParent, className) { | |
| if (oParent.querySelectorAll) { | |
| return oParent.querySelectorAll('.' + className); | |
| } else { | |
| var els = $$(oParent, '*'); | |
| var re = []; | |
| var i = 0; | |
| for (i = 0; i < els.length; i++) { | |
| if (els[i].className == className) | |
| re.push(els[i]); | |
| } | |
| return re; | |
| } | |
| } | |
| function Zoom() { | |
| this.init.apply(this, arguments); | |
| } | |
| Zoom.prototype = { | |
| init: function(options) { | |
| var _this = this; | |
| var config = { | |
| lensWidth: 50, | |
| lensHeight: 50 | |
| } | |
| this.oContainer = $('magnifier'); | |
| this.oLeft = $$$(this.oContainer, 'origin')[0]; | |
| this.oLimg = $$(this.oLeft, 'img')[0]; | |
| var zoom = this.oZoom = $$$(this.oContainer, 'large')[0]; | |
| this.oRimg = $$(this.oZoom, 'img')[0]; | |
| var mask = this.oMask = $$$(this.oContainer, 'mask')[0]; | |
| var lens = this.oLens = $$$(this.oContainer, 'lens')[0]; | |
| lens.style.width = (options && options.lensWidth || config.lensWidth) + 'px'; | |
| lens.style.height = (options && options.lensHeight || config.lensHeight) + 'px'; | |
| mask.onmouseover = function() { | |
| lens.style.display = 'block'; | |
| zoom.style.display = 'block'; | |
| }; | |
| mask.onmouseout = function() { | |
| lens.style.display = 'none'; | |
| zoom.style.display = 'none'; | |
| }; | |
| mask.onmousemove = function(e) { | |
| _this.mousemove(e); | |
| }; | |
| }, | |
| mousemove: function(e) { | |
| var ev = e || event; | |
| var lensX = (ev.clientX - this.oContainer.offsetLeft) - this.oLens.offsetWidth / 2; | |
| var lensY = (ev.clientY - this.oContainer.offsetTop) - this.oLens.offsetHeight / 2; | |
| var maxLeft = this.oMask.offsetWidth - this.oLens.offsetWidth; | |
| var maxTop = this.oMask.offsetHeight - this.oLens.offsetHeight; | |
| if (lensX < 0) { | |
| lensX = 0; | |
| } else if (lensX > maxLeft) { | |
| lensX = maxLeft; | |
| } | |
| if (lensY < 0) { | |
| lensY = 0; | |
| } else if (lensY > maxTop) { | |
| lensY = maxTop; | |
| } | |
| this.oLens.style.left = lensX + 'px'; | |
| this.oLens.style.top = lensY + 'px'; | |
| var percentX = lensX / maxLeft; | |
| var percentY = lensY / maxTop; | |
| this.oRimg.style.left = -percentX * (this.oRimg.offsetWidth - this.oZoom.offsetWidth) + 'px'; | |
| this.oRimg.style.top = -percentY * (this.oRimg.offsetHeight - this.oZoom.offsetHeight) + 'px'; | |
| } | |
| }; | |
| window.onload = function() { | |
| new Zoom({ | |
| lensWidth: 150, | |
| lensHeight: 150 | |
| }); | |
| // other way | |
| // new Zoom(); | |
| }; | |
| </script> | |
| <body> | |
| <div class="container" id="magnifier"> | |
| <div class="origin"> | |
| <span class="lens"></span> | |
| <span class="mask"></span> | |
| <img src="http://images.cnitblog.com/blog/36987/201306/07000559-22f3428b42c94cbfb6c4e38361740d56.jpg" alt="origin image" /> | |
| </div> | |
| <div class="large"><img src="http://images.cnitblog.com/blog/36987/201306/07000550-e9c81caad001460aaf9ed1871b18ea26.jpg" alt="large image" /></div> | |
| </div> | |
| </body> | |
| </html> |
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