今 天要在web中嵌套一个网址或本地HTML，用到了iframe，在电脑上设置scrolling=‘auto’，宽度高度，会有滚动条出现。而在 ipad上会全部显示整个网页的宽度高度。scrolling属性无效。原来在html5中的iframe已经只有剩下src的属性。
但是若设置scrolling=‘no’.还是会生效的。页面只显示定义的高度和宽度的大小。设置overflow:hidden都没用。
怎么让ipad safari 中的iframe的内容在固定大小中可滚动？
网上说要用seamless属性。直接写个seamless。但是这个属性ipad的safari不支持。chrome是支持的。
IE6 – Windows: no support
IE7 – Windows: no support
IE8 – Windows – Windows: no support
IE9 beta – Windows: no support
Firefox 3.6 – Windows: no support
Firefox 3.6 – OSX: no support
Firefox 4.0 – beta Windows: no support
Firefox 4.0 – beta OSX: no support
Safari OSX: no support
Chrome 7 – Windows: no support
Chrome 7 – Windows: no support
Chrome 9 – OSX: no support
Opera 11 – OSX: no support
测试例子：
http://www.maxdesign.com.au/jobs/example-seamless/
所以以上方法都无法解决ipad safari中iframe滚动的问题。
解决办法：
在iframe外加一层div，设置样式-webkit-overflow-scrolling:touch; overflow: scroll;
让超出div的内容可以通过touch来滚动。
另外，如果iframe的src不是网址，而是本地的html，则需要给HTML的DOM添加监听事件，让html的body可以监听到touch事件，让嵌套的html也可以滚动。
var toScrollFrame = function(iFrame, mask) { if (!navigator.userAgent.match(/iPad|iPhone/i)) return false; //do nothing if not iOS devie var mouseY = 0; var mouseX = 0; jQuery(iFrame).ready(function() {//wait for iFrame to load //remeber initial drag motition jQuery(iFrame).contents()[0].body.addEventListener('touchstart', function(e) { mouseY = e.targetTouches[0].pageY; mouseX = e.targetTouches[0].pageX; }); //update scroll position based on initial drag position jQuery(iFrame).contents()[0].body.addEventListener('touchmove', function(e) { e.preventDefault(); //prevent whole page dragging var box = jQuery(mask); box.scrollLeft(box.scrollLeft() + mouseX - e.targetTouches[0].pageX); box.scrollTop(box.scrollTop() + mouseY - e.targetTouches[0].pageY); //mouseX and mouseY don't need periodic updating, because the current position //of the mouse relative to th iFrame changes as the mask scrolls it. }); }); return true; }; toScrollFrame('.myFrame', '.myMask');
最终代码
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <title>wrapScroller demo</title> <link rel="stylesheet" href="../style/wrapScroller.css" type="text/css" media="screen" /> <script type="text/javascript" src="../jquery-1.8.0.min.js"></script> <script type="text/javascript"> </script> </head> <body style="background: #ccc;"> <div> HEADER - use 2 fingers to scroll contents: </div> <div id="scrollee" style="width:300px;height:300px;-webkit-overflow-scrolling:touch; overflow: scroll;"> <iframe id="object" height="90%" width="100%" type="text/html" src="http://en.wikipedia.org/"></iframe> </div> </body> </html>
参考：
http://stackoverflow.com/questions/6139564/iframe-size-on-ipad
http://jsfiddle.net/CobaltBlueDW/zHR8s/
http://stackoverflow.com/questions/4804604/html5-iframe-seamless-attribute
 PorterDuff及Xfermode详解)
