前几天做公司和开心网合作项目的时候 碰到iframe 跨域自适应的问题
刚开始很迷惑 开心网那边技术工程师给我发了一段这样子的代码
<body οnlοad="javascript: setHeight();"> <script> function setHeight(){ var dHeight = document.documentElement.scrollHeight; var t = document.createElement("div"); t.innerHTML = '<iframe id="kxiframeagent" src="http://xxxx.kaixin001.com/xxx/xxx.html#'+dHeight+'" scrolling="yes" height="0px" width="0px"></iframe>'; document.documentElement.appendChild(t.firstChild); } </script>
我想着跨域如何解决啊!后来去网上搜索了一下子 恍然大悟
具体如下 我是复制过来了 大家重点理解一下子它的实现思路 ：
iframe跨域自适应 问题:A域名下的页面a.htm中通过iframe嵌入B域名下的页面b.html,由于b.html的大小等是不可预知而且会变化的,所以需要 a.htm中的iframe自适应大小.问题本质 :js的跨域问题,因为要控制a.htm中iframe的大小就必须首先读取得到b.html的大小,A、B不属于同一个域,js的访问受限,读取不到b.html的大小. 解决方案:首先前提是A，B是合作关系,b.html中能引入A提供的js 首先a.html中通过iframe引入了b.htmlHtml代码 1 . < iframe id = " aIframe " height = " 0 " width = " 0 " 2 . src = " http://www.b.com/html/b.html " frameborder = " no " border = " 0px " marginwidth = " 0 " 3 . marginheight = " 0 " scrolling = " no " allowtransparency = " yes " >< / iframe> < iframe id = " aIframe " height = " 0 " width = " 0 " src = " http://www.b.com/html/b.html " frameborder = " no " border = " 0px " marginwidth = " 0 " marginheight = " 0 " scrolling = " no " allowtransparency = " yes " >< / iframe> B在b.html中引入了A提供的js文件Html代码 1 . < script language = " javascript " type = " text/javascript " src = " http://www.a.com/js/a.js " >< / script> < script language = " javascript " type = " text/javascript " src = " http://www.a.com/js/a.js " >< / script> 该js首先读取b.html的宽和高,然后创建一个iframe,src为和A同一个域的中间代理页面a_proxy.html,吧读取到的宽和高设置到src的hash里面Html代码 1 . < iframe id = " iframeProxy " height = " 0 " width = " 0 " src = " http://www.a.com/html/a_proxy.html#width|height " style = " display:none " >< / iframe> < iframe id = " iframeProxy " height = " 0 " width = " 0 " src = " http://www.a.com/html/a_proxy.html#width|height " style = " display:none " >< / iframe> a_proxy.html是A域下提供好的中间代理页面,它负责读取location.hash里面的width和height的值,然后设置与它同域下的a.html中的iframe的宽和高.Js代码 1 . var pParentFrame = parent.parent.document.getElementById( " aIframe " ); 2 . var locationUrlHash = 3 . parent.parent.frames[ " aIframe " ].frames[ " iframeProxy " ].location.hash; 4 . pParentFrame.style.width = locationUrlHash.split( " # " )[ 1 ].split( " | " )[ 0 ] + " px " ; 5 . pParentFrame.style.height = locationUrlHash.split( " # " )[ 1 ].split( " | " )[ 1 ] + " px " ; var pParentFrame = parent.parent.document.getElementById( " aIframe " ); var locationUrlHash = parent.parent.frames[ " aIframe " ].frames[ " iframeProxy " ].location.hash; pParentFrame.style.width = locationUrlHash.split( " # " )[ 1 ].split( " | " )[ 0 ] + " px " ; pParentFrame.style.height = locationUrlHash.split( " # " )[ 1 ].split( " | " )[ 1 ] + " px " ; 这样的话a.html中的iframe就自适应为b.html的宽和高了.
参考：http://zhhphappy.javaeye.com/blog/426689
转载于:https://www.cnblogs.com/qgd87/archive/2010/07/16/1778980.html
