iframe高度根据内容变化

我们在使用iframe的时候，iframe的高度并不会根据内容的多少来改变它的高度，如何让它根据内容来改变它的高度呢？在网上也找了好多代码，觉得下面这段代码是最有效的：

 var browserVersion = window.navigator.userAgent.toUpperCase();
     var isOpera = browserVersion.indexOf("OPERA") > -1 ? true : false;
     var isFireFox = browserVersion.indexOf("FIREFOX") > -1 ? true : false;
     var isChrome = browserVersion.indexOf("CHROME") > -1 ? true : false;
     var isSafari = browserVersion.indexOf("SAFARI") > -1 ? true : false;
     var isIE = (!!window.ActiveXObject || "ActiveXObject" in window);
     var isIE9More = (! -[1, ] == false);

     function reinitIframe(iframeId, minHeight) {
         try {
             var iframe = document.getElementById(iframeId);
             var bHeight = 0;
             if (isChrome == false && isSafari == false)
                 bHeight = iframe.contentWindow.document.body.scrollHeight;

             var dHeight = 0;
             if (isFireFox == true)
                 dHeight = iframe.contentWindow.document.documentElement.offsetHeight + 2;
             else if (isIE == false && isOpera == false)
                 dHeight = iframe.contentWindow.document.documentElement.scrollHeight;
             else if (isIE == true && isIE9More) {//ie9+
                 var heightDeviation = bHeight - eval("window.IE9MoreRealHeight" + iframeId);
                 if (heightDeviation == 0) {
                     bHeight += 3;
                 } else if (heightDeviation != 3) {
                     eval("window.IE9MoreRealHeight" + iframeId + "=" + bHeight);
                     bHeight += 3;
                 }
             }
             else//ie[6-8]、OPERA
                 bHeight += 3;

             var height = Math.max(bHeight, dHeight);
             if (height < minHeight) height = minHeight;
             iframe.style.height = height + "px";
         } catch (ex) { }
     }
     function startInit(iframeId, minHeight) {
         eval("window.IE9MoreRealHeight" + iframeId + "=0");
         window.setInterval("reinitIframe('" + iframeId + "'," + minHeight + ")", 100);
     }
     var minHeight = $(window).height();
     startInit('mainframe', minHeight);

html的源代码如下，index.html是你要引用的页面：

 <iframe src="index.htm" width="100%" height="100%" frameborder="0" name="mainframe" id="mainframe" scrolling="no"></iframe>

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