javascript opacity兼容性随笔
一、CSS兼容代码
1 2 3 4 5 6 | . transparent { filter:alpha(opacity= 50 ); /* IE */ -moz-opacity: 0.5 ; /* FireFox old version*/ -khtml-opacity: 0.5 ; /* Sarfari old version */ opacity: 0.5 ; /* FireFox */ } |
二、Javascript兼容代码
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | if (!window.jasen.core.Util) { window.jasen.core.Util = {}; } var $ = function (id) { return document.getElementById(id); } function style(element, key, value) { if ( typeof element == "string" ) { element = $(element); } if (value) { element.style[key] = value; } else { return element.style[key]; } }; function opacity(element, /*0-100*/ opacityValue) { var opacityValue = parseInt(opacityValue); style(element, "filter" , "alpha(opacity=" + opacityValue + ")" ); opacityValue /= 100.0; style(element, "MozOpacity" , opacityValue); style(element, "KhtmlOpacity" , opacityValue); style(element, "opacity" , opacityValue); }; var Util = window.Util = window.jasen.core.Util; Util.opacity = opacity; Util.style = style; |
三、范例
<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <style type="text/css"> #content { width:300px; margin:20px auto; } </style> <script src="Scripts/jasen.Core.Util.js" type="text/javascript"></script> <script type="text/javascript"> window.onload = function () { var seletor = document.getElementById("opacitySeletor"); seletor.options.add(new Option("--请选择--", "100")); for (var i = 0; i <= 100; i++) { seletor.options.add(new Option(i, i)); } seletor.onmousewheel = function (event) { event = event || window.event; var currentIndex = seletor.selectedIndex - event.wheelDelta / 120; if (currentIndex < 0) { seletor.selectedIndex = seletor.options.length - 1; } else if (currentIndex > seletor.options.length - 1) { seletor.selectedIndex = 0; } else { seletor.selectedIndex = currentIndex; } seletor.onchange(); return false; } } function changeOpacity() { var element = document.getElementById("opacitySeletor"); if (element.selectedIndex < 0) { return; } var opacityValue = element[element.selectedIndex].value; if (opacityValue != "") { Util.opacity("opacityImg", opacityValue); } } </script> </head> <body> <form id="form1" runat="server"> <div> <div id="content"> <select id="opacitySeletor" onchange="return changeOpacity();"></select> <img id = "opacityImg" src="Images/car.jpg" title="car opacity" alt="car opacity" /> </div> </div> </form> </body> </html>
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2011-11-08 lINE