1 把如下代码复制到<head>与</head>之间 <SCRIPT LANGUAGE="JavaScript"> <!-- document.getElementsByClassName = function(className) { var children = document.getElementsByTagName('*') || document.all; var elements = new Array(); for (var i = 0; i < children.length; i++) { var child = children[i]; var classNames = child.className.split(' '); for (var j = 0; j < classNames.length; j++) { if (classNames[j] == className) { elements.push(child); break; } } } return elements; } var Reflection = { defaultHeight : 0.5, defaultOpacity: 0.5, add: function(image, options) { Reflection.remove(image); doptions = { "height" : Reflection.defaultHeight, "opacity" : Reflection.defaultOpacity } if (options) { for (var i in doptions) { if (!options[i]) { options[i] = doptions[i]; } } } else { options = doptions; } try { var d = document.createElement('div'); var p = image; var classes = p.className.split(' '); var newClasses = ''; for (j=0;j<classes.length;j++) { if (classes[j] != "reflect") { if (newClasses) { newClasses += ' ' } newClasses += classes[j]; } } var reflectionHeight = Math.floor(p.height*options['height']); var divHeight = Math.floor(p.height*(1+options['height'])); var reflectionWidth = p.width; /* Copy original image's classes & styles to div */ d.className = newClasses; p.className = 'reflected'; d.style.cssText = p.style.cssText; p.style.cssText = ' '; if (document.all && !window.opera) { var reflection = document.createElement('img'); reflection.src = p.src; reflection.style.width = reflectionWidth+'px'; reflection.style.marginBottom = "-"+(p.height-reflectionHeight)+'px'; reflection.style.filter = 'flipv progid:DXImageTransform.Microsoft.Alpha(opacity='+(options['opacity']*100)+', style=1, finishOpacity=0, startx=0, starty=0, finishx=0, finishy='+(options['height']*100)+')'; d.style.width = reflectionWidth+'px'; d.style.height = divHeight+'px'; p.parentNode.replaceChild(d, p); d.appendChild(p); d.appendChild(reflection); } else { var canvas = document.createElement('canvas'); var context = canvas.getContext("2d"); canvas.style.height = reflectionHeight+'px'; canvas.style.width = reflectionWidth+'px'; canvas.height = reflectionHeight; canvas.width = reflectionWidth; d.style.width = reflectionWidth+'px'; d.style.height = divHeight+'px'; p.parentNode.replaceChild(d, p); d.appendChild(p); d.appendChild(canvas); context.save(); context.translate(0,image.height-1); context.scale(1,-1); context.drawImage(image, 0, 0, reflectionWidth, image.height); context.restore(); context.globalCompositeOperation = "destination-out"; var gradient = context.createLinearGradient(0, 0, 0, reflectionHeight); gradient.addColorStop(1, "rgba(255, 255, 255, 1.0)"); gradient.addColorStop(0, "rgba(255, 255, 255, "+(1-options['opacity'])+")"); context.fillStyle = gradient; if (navigator.appVersion.indexOf('WebKit') != -1) { context.fill(); } else { context.fillRect(0, 0, reflectionWidth, reflectionHeight*2); } } } catch (e) { } }, remove : function(image) { if (image.className == "reflected") { image.className = image.parentNode.className; image.parentNode.parentNode.replaceChild(image, image.parentNode); } } } function addReflections() { var rimages = document.getElementsByClassName('reflect'); for (i=0;i<rimages.length;i++) { var rheight = null; var ropacity = null; var classes = rimages[i].className.split(' '); for (j=0;j<classes.length;j++) { if (classes[j].indexOf("rheight") == 0) { var rheight = classes[j].substring(7)/100; } else if (classes[j].indexOf("ropacity") == 0) { var ropacity = classes[j].substring(8)/100; } } Reflection.add(rimages[i], { height: rheight, opacity : ropacity}); } } var previousOnload = window.onload; window.onload = function () { if(previousOnload) previousOnload(); addReflections(); } //--> </SCRIPT> 2 把如下代码复制到<body>与</body>之间 <img class="reflect" src="butong_net.jpg">
