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;

        }

    }