JavaScript自动设置IFrame高度(兼容各主流浏览器)

function SetIFrameHeight(down) {        var Sys = {};        var ua = navigator.userAgent.toLowerCase();        var s;        (s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] :        (s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] :        (s = ua.match(/chrome\/([\d.]+)/)) ? Sys.chrome = s[1] :        (s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] :        (s = ua.match(/version\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0;        var pTar = null;        if (document.getElementById) {            pTar = document.getElementById(down);        } else {            eval('pTar=' + down + ';');        }        pTar.style.display = "block";        if (Sys.ie) {            if (Sys.ie == '9.0') {                pTar.height = pTar.contentWindow.document.body.offsetHeight + 15 + "px";                pTar.width = pTar.contentWindow.document.body.scrollWidth + "px";            } else if (Sys.ie == '8.0') {                debugger;                pTar.height = pTar.Document.body.offsetHeight + 15 + "px";                pTar.width = pTar.Document.body.scrollWidth + "px";            } else {                pTar.height = pTar.Document.body.scrollHeight + 25 + "px";                pTar.width = pTar.Document.body.scrollWidth + "px";            }        }        if (Sys.firefox) {            pTar.height = pTar.contentDocument.body.offsetHeight + 15 + "px";            pTar.width = pTar.contentDocument.body.scrollWidth + "px";        }        if (Sys.chrome) {            pTar.height = pTar.contentDocument.body.offsetHeight;            pTar.width = pTar.contentDocument.body.scrollWidth;        }        if (Sys.opera) {            pTar.height = pTar.contentDocument.body.offsetHeight;            pTar.width = pTar.contentDocument.body.scrollWidth;        }        if (Sys.safari) {            if (pTar.contentDocument.body.offsetHeight <= '186') {                pTar.height = pTar.contentDocument.body.offsetHeight + 10;            } else {                pTar.height = pTar.contentDocument.body.offsetHeight;            }            pTar.width = pTar.contentDocument.body.scrollWidth;        }    }